研究者業績

瀧本 幸司

タキモト コウジ  (Koji Takimoto)

基本情報

所属
国立研究開発法人宇宙航空研究開発機構 宇宙科学研究所 日本学術振興会特別研究員-PD
学位
博士(理学)(2022年3月 関西学院大学)
修士(理学)(2019年3月 関西学院大学)

連絡先
takimoto.kohjijaxa.jp
研究者番号
40967569
ORCID ID
 https://orcid.org/0000-0002-8405-9549
J-GLOBAL ID
202201014396272085
researchmap会員ID
R000036452

論文

 17
  • Richard M. Feder, James J. Bock, Yun-Ting Cheng, Asantha Cooray, Phillip M. Korngut, Shuji Matsuura, Chi H. Nguyen, Kohji Takimoto, Michael Zemcov, CIBER collaboration
    2025年1月29日  
    Precise, unbiased measurements of extragalactic background anisotropies require careful treatment of systematic effects in fluctuation-based, broad-band intensity mapping measurements. In this paper we detail improvements in methodology for the Cosmic Infrared Background ExpeRiment (CIBER), concentrating on flat field errors and source masking errors. In order to bypass the use of field differences, which mitigate flat field errors but reduce sensitivity, we characterize and correct for the flat field on pseudo-power spectra, which includes both additive and multiplicative biases. To more effectively mask point sources at 1.1 $\mu$m and 1.8 $\mu$m, we develop a technique for predicting masking catalogs that utilizes optical and NIR photometry through random forest regression. This allows us to mask over two Vega magnitudes deeper than the completeness limits of 2MASS alone, with errors in the shot noise power remaining below $<10\%$ at all masking depths considered. Through detailed simulations of CIBER observations, we validate our formalism and demonstrate unbiased recovery of the sky fluctuations on realistic mocks. We demonstrate that residual flat field errors comprise $<20\%$ of the final CIBER power spectrum uncertainty with this methodology.
  • Richard M. Feder, James J. Bock, Yun-Ting Cheng, Asantha Cooray, Phillip M. Korngut, Shuji Matsuura, Jordan Mirocha, Chi H. Nguyen, Kohji Takimoto, Kohji Tsumura, Ryan Wills, Michael Zemcov, CIBER collaboration
    2025年1月29日  
    We present new anisotropy measurements in the near-infrared (NIR) for angular multipoles $300<\ell<10^5$ using imaging data at 1.1 $\mu$m and 1.8 $\mu$m from the fourth flight of the Cosmic Infrared Background ExpeRiment (CIBER). Using improved analysis methods and higher quality fourth flight data, we detect surface brightness fluctuations on scales $\ell<2000$ with CIBER auto-power spectra at $\sim14\sigma$ and 18$\sigma$ for 1.1 and 1.8 $\mu$m, respectively, and at $\sim10\sigma$ in cross-power spectra. The CIBER measurements pass internal consistency tests and represent a $5-10\times$ improvement in power spectrum sensitivity on several-arcminute scales relative to that of existing studies. Through cross-correlations with tracers of diffuse galactic light (DGL), we determine that scattered DGL contributes $<10\%$ to the observed fluctuation power at high confidence. On scales $\theta > 5'$, the CIBER auto- and cross-power spectra exceed predictions for integrated galactic light (IGL) and integrated stellar light (ISL) by over an order of magnitude, and are inconsistent with our baseline IGL+ISL+DGL model at high significance. We cross-correlate two of the CIBER fields with 3.6 $\mu$m and 4.5 $\mu$m mosaics from the Spitzer Deep Wide-Field Survey and find similar evidence for departures from Poisson noise in Spitzer-internal power spectra and CIBER $\times$ Spitzer cross-power spectra. A multi-wavelength analysis indicates that the auto-power of the fluctuations at low-$\ell$ is bluer than the Poisson noise from IGL and ISL; however, for $1' <\theta < 10'$, the cross-correlation coefficient $r_{\ell}$ of nearly all band combinations decreases with increasing $\theta$, disfavoring astrophysical explanations that invoke a single correlated sky component.
  • Shunsuke Nakagawa, Chinathip Narongphun, Zamba Leonel, Hari Shrestha, Isami Kato, Emino Fukumoto, Rodrigo Cordova, Victor Hugo Schulz, Necmi Cihan Örger, Kei Sano, Takao Nakagawa, Koji Takimoto, Shuji Matsuura, Kohji Tsumura, Aoi Takahashi, Daisuke Nakayama, Akimasa Ojika, Rin Sato, Keenan A. A. Chatar, Yukihisa Otani, Ezra Fielding, Kentaro Hayashida, Hayato Tanaka, Eyoas E. Areda, Bastien B. A. Morelle, Hisataka Kawasaki, Umi Enokidani, Reynel Josue Galindo Rosales, Karaki Shohei, Ichiro Jikuya
    Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave 13092 117-117 2024年8月23日  
    Extragalactic Background Light (EBL), the cumulative light from outside the galaxy, is a crucial observational target for understanding the history of the universe. We are developing a CubeSat; VERTECS (Visible Extragalactic background RadiaTion Exploration by CubeSat) with a 6U size (approximately 10 × 20 × 30 cm), equipped with Solar Array Wings (SAW). Our mission is to conduct extensive observations of the visible EBL. The satellite is designed to operate in a sun-synchronous orbit at an altitude of 500-680 km (approximately 15 orbits per day) and observe the EBL on the shadow side to avoid stray light from the Sun and Earth. To observe EBL, a high-performance CMOS sensor, attitude control devices, and high-speed communication equipment X-band are essential. We should note that these components these components consume a significant amount of power. Therefore, some strategic operational plans are necessary to operate this CubeSat within the limited power resources. In addition, VERTECS needs to meet its mission requirements, conducting 10 observations, 4 data downlinks, and 1 command uplink within a day. We have constructed some operational scenarios utilizing attitude control and SAW to meet these requirements, and we also constructed a power budget simulation for VERTECS. In this presentation, we describe how we plan to operate VERTECS utilizing the subsystems and the results of the power simulation during the operation.
  • Hisataka Kawasaki, Eyoas E. Areda, Hideo Matsuhara, Hirokazu Masui, Kohji Takimoto, Bastien B. A. Morelle, Shuji Matsuura, Takao Nakagawa, Umi Enokidani, Yuki Hirose, Kei Sano
    Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave 13092 116-116 2024年8月23日  
    The extragalactic background light (EBL) is the integrated emission from out of our Galaxy.Its observation is crucial for revealing the history of star-formation from the early universe to the present epoch. Visible Extragalactic background RadiaTion Exploration by CubeSat (VERTECS) is a 6U astronomical satellite to observe the EBL in visible wavelength from 0.4 µm to 0.8 µm. To observe the EBL, a telescope with 11 lenses and a high-performance CMOS sensor are equipped within 3U volume. The remaining 3U comprises the bus section mainly based on the bus design previously developed at Kyushu Institute of Technology. This paper describes the design and verification processes of the structure and thermal model of the satellite to fulfill the interface and mission requirements. From a mission perspective, the precise attitude and orbit control system unit is mounted on the same interface plate as the telescope to meet stringent pointing stability requirements during observations. The purpose of the stiff design of this interface plate is to minimize structural deformation. Furthermore, integrating multiple external antennas with relatively large X-band and S-band communication units require effective routing harness management. Static stress analysis is performed under the quasi-static loading condition. In addition, modal analysis is also conducted to fulfill the strength and stiffness requirements of the launcher. A series of mechanical environmental tests (shock, random, and sinusoidal vibrations) have been conducted to verify the design and analysis results. The results showed that designed model can fundamentally withstand the launch environment.
  • Hayato Tanaka, Hideo Matsuhara, Takao Nakagawa, Koji Takimoto, Aoi Takahashi, Satoshi Ikari, Rodrigo Cordova, Victor Hugo Schulz, Necmi Cihan Örger, Shunsuke Nakagawa, Shuji Matsuura, Kohji Tsumura
    Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave 13092 115-115 2024年8月23日  
    The Visible Extragalactic background RadiaTion Exploration by CubeSat (VERTECS) is designed for observing Extragalactic Background Light(EBL). VERTECS mission requires attitude control stability better than 10 arcsec (1σ) per minute, pointing accuracy better than 0.1 deg, and the slew rate faster than 1 deg per sec. We discuss the software-in-the-loop (SIL) attitude simulator simulation to verify whether the current Attitude Determination Control System (ADCS) design and the planned orbit can meet the requirements for EBL observations. We simulate the attitude control system with the simulation software, taking into account the attitude control commands, the parameters of the ADCS hardware, and the expected attitude disturbances in the assumed orbit. This simulation shows the sequence of attitude maneuvers needed to meet the requirement. The simulation results indicate that the current observation sequence is feasible.
  • Kei Sano, Takao Nakagawa, Shuji Matsuura, Koji Takimoto, Aoi Takahashi, Tetsuhito Fuse, Rodrigo Cordova, Victor Hugo Schulz, Pooja Lepcha, Necmi Cihan Örger, Daisuke Nakayama, Joseph Ofosu, Reynel Josue Galindo Rosales, Eyoas E. Areda, Pema Zangmo, Ezra Fielding, Keenan A. A. Chatar, Yukihisa Otani, Hisataka Kawasaki, Bastien B. A. Morelle, John Almonte, Shunsuke Nakagawa, Yuto Tome, Shohei Karaki, Chinathip Narongphun, Hari Shrestha, Marco Rosa, David Dai, Wenceslao Bejarano, Akihiro Ikeda, Rin Sato, Kentaro Hayashida, Hiroki Miyagawa, Masahiro Nishioka, Kana Kurosaki, Isami Kato, Satoshi Ikari, Kohji Tsumura, Ichiro Jikuya, Hideo Matsuhara, Umi Enokidani, Hayato Tanaka, Yuki Hirose, Akimasa Ojika, Akane Tsumoto, Taiko Iwaki, Yuki Ohara, Mengu Cho, Kentaro Kitamura, Hirokazu Masui, Mariko Teramoto, Takashi Yamauchi, Ryo Hashimoto, Emino Fukumoto, Zamba Leonel, Arisa Oho, Shoki Yabumoto, Hayato Masuno, Chisato Arakawa, Kouta Miyamoto, Takehiko Wada, Naoki Isobe, Yasuyuki Miyazaki, Ryu Funase, Hajime Kawahara, Keiichi Hirako, Yoichi Yatsu, Yoshihide Aoyanagi
    Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave 13092 33-33 2024年8月23日  
    We describe scientific o bjective a nd p roject s tatus o f a n a stronomical 6 U C ubeSat m ission V ERTECS (Visible Extragalactic background RadiaTion Exploration by CubeSat). The scientific g oal o f V ERTECS i s t o reveal the star-formation history along the evolution of the universe by measuring the extragalactic background light (EBL) in the visible wavelength. Earlier observations have shown that the near-infrared EBL is several times brighter than integrated light of individual galaxies. As candidates for the excess light, first-generation s tars in the early universe or low-redshift intra-halo light have been proposed. Since these objects are expected to show different e mission s pectra i n v isible w avelengths, m ulti-color v isible o bservations a re c rucial t o r eveal t he origin of the excess light. Since detection sensitivity of the EBL depends on the product of the telescope aperture and the field o f v iew, i t i s p ossible t o o bserve i t w ith a s mall b ut w ide-field te lescope sy stem th at ca n be mounted on the limited volume of CubeSat. In VERTECS mission, we develop a 6U CubeSat equipped with a 3U-sized telescope optimized for observation of the visible EBL. The bus system composed of onboard computer, electric power system, communication subsystem, and structure is based on heritage of series of CubeSats developed at Kyushu Institute of Technology in combination with high-precision attitude control subsystem and deployable solar array paddle required for the mission. The VERTECS mission was selected for JAXA-Small Satellite Rush Program (JAXA-SMASH Program), a new program that encourages universities, private companies and JAXA to collaborate to realize small satellite missions utilizing commercial small launch opportunities, and to diversify transportation services in Japan. We started the satellite development in December 2022 and plan to launch the satellite in FY2025.
  • Shuji Matsuura, James J. Bock, Asantha Cooray, Candice Fazar, Richard Feder, Ryo Hashimoto, Grigory Heaton, Viktor Hristov, Yuya Kawano, Phillip M. Korngut, Dae-Hee Lee, Chika Matsumi, Dale Mercado, Shunsuke Nakagawa, Tomoya Nakagawa, Shuta Nakahata, Chi H. Nguyen, Kazuma Noda, Dorin Patru, Won-Kee Park, Kei Sano, Aoi Takahashi, Koji Takimoto, Momoko Tamai, Kohji Tsumura, Michael B. Zemcov
    Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave 13092 32-32 2024年8月23日  
    The extragalactic background light (EBL) is the integrated diffuse emissions from unresolved stars, galaxies, and intergalactic matter along the line of sight. The EBL is regarded as consisting of stellar emissions and thus an important observational quantity for studying global star formation history throughout cosmic time. Intensity and anisotropy in the near-infrared EBL as measured by the Cosmic Infrared Background ExpeRiment (CIBER), NASA’s sounding rocket experiment, and previous infrared satellites exceed the predicted signal from galaxy clustering alone. The objective of CIBER-2 is to unveil the EBL excess by observing it at extended wavelengths into the visible spectrum with an accuracy better than CIBER. The onboard instrument of CIBER-2 comprises a 28.5-cm telescope cooled to 90K, and three HAWAII-2RG detectors coupled with dual-band filters for photometric mapping observations in six wavebands simultaneously and with linear variable filters for low-resolution spectroscopy. Although CIBER-2 made a successful first flight from White Sands Missile Range in New Mexico in 2021, technical problems such as contamination of thermal radiation from the rocket chassis and degradation of the mirror coat were recognized. Despite a successful second flight in 2023 solving the problems with the revised onboard instrument, the experiment was aborted because of trouble with the rocket tracking system. In this paper, we describe the parachute-recovered payload rebuilt after the second flight and the testing, and we report the successful flight on May 5th 2024.
  • Kohji Takimoto, Yuki Hirose, Taiko Iwaki, Hisataka Kawasaki, Shuji Matsuura, Shunsuke Nakagawa, Takao Nakagawa, Akimasa Ojika, Rin Sato, Aoi Takahashi, Yuto Tome, Akane Tsumoto, Kohji Tsumura, Kei Sano
    Space Telescopes and Instrumentation 2024: Optical, Infrared, and Millimeter Wave 13092 34-34 2024年8月23日  筆頭著者責任著者
    The extragalactic background light (EBL) is the integrated emission from all objects outside of the Milky Way galaxy and is a crucial observational quantity in the broader study of the history of cosmic structures. In the near-infrared EBL, there have been measurements of an emission component several times brighter than the cumulative light from extragalactic galaxies. This unknown radiation component has led to proposals for candidate source objects, such as first stars and galactic halo brown dwarfs. These source objects exhibit distinct radiation spectra in the visible wavelength. The VERTECS (Visible Extragalactic background RadiaTion Exploration by CubeSat) project is focused on continuously observing the visible EBL using a wide-field small telescope on a 6U CubeSat. The primary characteristic of this telescope is its high-throughput (SΩ > 10−6 m2sr). The 3U-sized optical telescope onboard this satellite consists of a lens optics with a total field of view of 6◦ × 6◦, pixel field of view of 11” × 11”, a highly sensitive and low-noise detector module, and a baffle to eliminate stray light from the Sun and Earth. Additionally, color filters divide the wavelength range from 400 to 800 nm into four bands. Our observation strategy involves capturing 60-second exposure images while shifting the observed field by 3◦ increments and stacking the acquired images to perform photometry in the four bands. Thus far, most of the telescope design has met the required specifications, and the project is currently advancing towards the production of an engineering model. This project was selected in the JAXA-SMASH and is currently progressing in satellite development with a planned launch in the 2025 fiscal year. In this presentation, we will report on the strategy for observing the visible EBL, the progress in the development of the optical telescope, and the future plans.
  • Kei Sano, Rodrigo Cordova, Victor Hugo Schulz, Pooja Lepcha, Necmi Cihan Örger, Daisuke Nakayama, Joseph Ofosu, Reynel Josué, Galindo Rosales, Pema Zangmo, Ezra Fielding, Keenan Chatar, Yukihisa Otani, Hisataka Kawasaki, Bastien Morelle, John Paul Almonte, Shunsuke Nakagawa, Yuto Tome, Shohei Karaki, Chinathip Narongphun, Hari Ram Shrestha, Marco Rosa, David Dai, Wenceslao Bejarano, Akihiro Ikeda, Rin Sato, Yusuke Iwaki, Kentaro Hayashida, Hiroki Miyagawa, Masahiro Nishioka, Kana Kurosaki, Isami Kato, Mengu Cho, Hirokazu Masui, Tetsuhito Fuse, Eyoas Areda, Kentaro Kitamura, Mariko Teramoto, Takashi Yamauchi, Ryo Hashimoto, Emino Fukumoto, Zamba Leonel, Arisa Oho, Shoki Yabumoto, Hayato Masuno, Chisato Arakawa, Kouta Miyamoto, Takao Nakagawa, Kohji Takimoto, Aoi Takahashi, Hideo Matsuhara, Umi Enokidani, Hayato Tanaka, Naoki Isobe, Yasuyuki Miyazaki, Ryu Funase, Hajime Kawahara, Keiichi Hirako, Shuji Matsuura, Yuki Hirose, Akimasa Ojika, Akane Tsumoto, Taiko Iwaki, Yuki Ohara, Satoshi Ikari, Kohji Tsumura, Ichiro Jikuya, Takehiko Wada, Yoichi Yatsu, Yoshihide Aoyanagi
    Proceedings of the Small Satellite Conference WIV(02) 2024年8月  
  • Kohji Takimoto, Takao Nakagawa, Aoi Takahashi, Kei Sano, Yuto Tome, Hisataka Kawasaki, Shunsuke Nakagawa, Rin Sato, Shuji Matsuura, Yuki Hirose, Akimasa Ojika, Akane Tsumoto, Taiko Iwaki, Kohji Tsumura
    Proceedings of the Small Satellite Conference WⅢ(05) 2024年8月  筆頭著者責任著者
  • Masaki Hanzawa, Shuji Matsuura, Aoi Takahashi, Ranga Ram Chary, Kei Sano, Kohji Takimoto, Yuto Tome
    Publications of the Astronomical Society of Japan 76(3) 353-364 2024年6月1日  査読有り
    Measuring the absolute brightness of the zodiacal light (ZL), which is the sunlight scattered by interplanetary dust particles, is important not only for understanding the physical properties of the dust but also for constraining the extragalactic background light (EBL) by subtracting the ZL foreground. We describe the results of high-resolution spectroscopic observations of the night sky in the wavelength range of 300-900 nm with the double spectrograph on the Hale telescope to determine the absolute brightness of the ZL continuum spectra from the Fraunhofer absorption line intensities. The observed fields are part of the fields observed by the Spitzer Space Telescope for the EBL study. Assuming that the spectral shape of the zodiacal light is identical to the solar spectrum in a narrow region around the Fraunhofer lines, we decomposed the observed sky brightness into multiple emission components by amplitude parameter fitting with spectral templates of the airglow, ZL, diffuse Galactic light, integrated starlight, and other isotropic components including EBL. As a result, the ZL component with the Ca ii λλ 393.3, 396.8 nm Fraunhofer lines around 400 nm is clearly separated from the others in all fields with uncertainties around 20%, mainly due to the template errors and the time variability of the airglow. The observed ZL brightness in most of the observed fields is consistent with the modeled ZL brightness calculated by combining the most conventional ZL model at 1250 nm based on the Diffuse Infrared Background Experiment and the observational ZL template spectrum based on the Hubble Space Telescope. However, the ecliptic plane observation is considerably fainter than the ZL model, and this discrepancy is discussed in terms of the optical properties of the interplanetary dust accreted in the ecliptic plane.
  • Kohji Tsumura, Shuji Matsuura, Kei Sano, Takahiro Iwata, Hajime Yano, Kohei Kitazato, Kohji Takimoto, Manabu Yamada, Tomokatsu Morota, Toru Kouyama, Masahiko Hayakawa, Yasuhiro Yokota, Eri Tatsumi, Moe Matsuoka, Naoya Sakatani, Rie Honda, Shingo Kameda, Hidehiko Suzuki, Yuichiro Cho, Kazuo Yoshioka, Kazunori Ogawa, Kei Shirai, Hirotaka Sawada, Seiji Sugita
    Earth, Planets and Space 75(1) 2023年8月22日  査読有り
    Abstract The zodiacal light (ZL) is sunlight scattered by interplanetary dust (IPD) in the optical wavelengths. The spatial distribution of IPD in the Solar system may hold an important key to understanding the evolution of the Solar system and material transportation within it. The IPD number density can be expressed as [[EQUATION]] , and the result of [[EQUATION]] was obtained by the previous observations from the interplanetary space by Helios 1/2 and Pioneer 10/11 in the 1970s and 1980s. However, no direct measurements of [[EQUATION]] based on the ZL observation from the interplanetary space outside the Earth's orbit have been conducted since then. Here we introduce the initial result of the ZL radial profile at optical wavelengths observed at 0.76-1.06 au by ONC-T with Hayabusa2# mission in 2021-2022. The obtained ZL brightness is well reproduced by the model brightness, but there is a small excess of the observed ZL brightness over the model brightness at around 0.9 au. The obtained radial power-law index is [[EQUATION]] , which is consistent with the previous results based on the ZL observations. The dominant uncertainty source arises from the uncertainty in the Diffuse Galactic Light estimation.
  • Kohji Takimoto, Shuji Matsuura, Kei Sano, Richard M. Feder
    The Astrophysical Journal 944(2) 229 2023年2月1日  査読有り筆頭著者責任著者
    We report near-infrared polarization of the zodiacal light (ZL) measured from space by the Diffuse Infrared Background Experiment (DIRBE) on board the Cosmic Background Explorer in photometric bands centered at 1.25, 2.2, and 3.5 μm. To constrain the physical properties of interplanetary dust, we use DIRBE Weekly Sky Maps to investigate the solar elongation (epsilon), ecliptic latitude (β), and wavelength (λ) dependence of ZL polarization. We find that the polarization of the ZL varies as a function of epsilon and β, consistent with observed polarization at λ = 550 nm. While the polarization dependence on wavelength at (epsilon, β) = (90°, 0°) is modest (increasing from 17.7% ± 0.2% at 1.25% μm to 21.0% ± 0.3% at 3.5 μm), the variation is more pronounced at the north ecliptic pole (23.1% ± 1.6%, 35.1% ± 2.0%, and 39.3% ± 2.1% at 1.25, 2.2, and 3.5 μm, respectively). The variation in ZL polarization with wavelength is not explained by either Rayleigh scattering or absorptive particles larger than 10 μm.
  • Kohji Takimoto, Toshiaki Arai, Shuji Matsuura, James J. Bock, Asantha Cooray, Richard M. Feder, Phillip M. Korngut, Alicia Lanz, Dae Hee Lee, Toshio Matsumoto, Chi H. Nguyen, Yosuke Onishi, Kei Sano, Mai Shirahata, Aoi Takahashi, Kohji Tsumura, Michael Zemcov
    The Astrophysical Journal 926(1) 6-6 2022年2月8日  査読有り筆頭著者責任著者
    We report the first measurement of the zodiacal light (ZL) polarization spectrum in the near-infrared between 0.8 and 1.8 mu m. Using the low-resolution spectrometer on board the Cosmic Infrared Background Experiment, calibrated for absolute spectrophotometry and spectropolarimetry, we acquire long-slit polarization spectral images of the total diffuse sky brightness toward five fields. To extract the ZL spectrum, we subtract the contribution of other diffuse radiation, such as the diffuse galactic light, the integrated starlight, and the extragalactic background light. The measured ZL polarization spectrum shows little wavelength dependence in the near-infrared, and the degree of polarization clearly varies as a function of the ecliptic coordinates and solar elongation. Among the observed fields, the North Ecliptic Pole shows the maximum degree of polarization of similar to 20%, which is consistent with an earlier observation from the Diffuse Infrared Background Experiment on board on the Cosmic Background Explorer. The measured degree of polarization and its solar elongation dependence are reproduced by an empirical scattering model in the visible band and also by a Mie scattering model for large absorptive particles, while a Rayleigh scattering model is ruled out. All of our results suggest that the interplanetary dust is dominated by large particles.
  • Kohji Takimoto, Seung Cheol Bang, Priyadarshini Bangale, James J. Bock, Asantha Cooray, Kenta Danbayashi, Richard M. Feder, Masaki Furutani, Kevin Gates, Ryo Hashimoto, Viktor Hristov, Arisa Kida, Phillip Korngut, Alicia Lanz, Dae Hee Lee, Lunjun Liu, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Jodi Ann Morgan, Chi H. Nguyen, Won Kee Park, Dorin Patru, James Parkus, Shohta Sakai, Kei Sano, Hiroko Suzuki, Aoi Takahashi, Sohta Tatsu, Kohji Tsumura, Takehiko Wada, Shiang Yu Wang, Yasuhiro Yamada, Michael Zemcov
    Proceedings of SPIE - The International Society for Optical Engineering 11443 2020年  筆頭著者責任著者
    The total integrated emission from galaxies, known as the Extragalactic Background Light (EBL), is an important observable for understanding the history of star formation over the history of the universe. Spatial fluctuations in the infrared EBL as measured by the Cosmic Infrared Background ExpeRiment (CIBER), Spitzer and AKARI exceed the predicted signal from galaxy clustering alone. The CIBER-2 project seeks to extend CIBER observa- tions of the EBL throughout the near infrared into the optical, through measurements above Earth's atmosphere during a suborbital sounding rocket flight. The experiment has a LN2-cooled 28.5 cm Cassegrain telescope along with three optical paths and dichroic beamsplitters, which are used to obtain three wide-field images in six broad spectral bands between 0.5-2.0 μm. The three focal planes also contain linear variable filters (LVFs) which simultaneously take spectra with resolution R=20 across the same range. CIBER-2 is scheduled to y multiple times on a Black Brant IX sounding rocket from White Sands Missile Range in the New Mexico desert. For the first flight, scheduled for early 2021, we have completed a variety of pre-flight optical tests, which we use to make focus adjustments, spectral response measurements, and absolute photometric calibrations. In this paper, we describe the methods behind these tests and present their results for pre-flight performance evaluation. In particular, we present measurements of the PSF for each broad spectral band, along with absolute calibration factors for each band and the LVF. Through monochromator scans, we also measure the spectral responsivity of each LVF as a function of position.
  • Chi H. Nguyen, Benjamin Stewart, Seung-Cheol Bang, James J. Bock, Asantha Cooray, Kenta Danbayashi, Ambar DeSantiago, Viktor Hristov, Tomoya Kojima, Phillip Korngut, Kevin Kruse, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Jared Loewenthal, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Ryo Ohta, Christian Pape, Won-Kee Park, Dorin Patru, James Parkus, Mark Peryer, Kei Sano, Aoi Takahashi, Kohji Takimoto, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, Michael Zemcov
    SPACE TELESCOPES AND INSTRUMENTATION 2018: OPTICAL, INFRARED, AND MILLIMETER WAVE 10698 2018年  
    The extragalactic background light (EBL) is the integrated emission from all objects outside of the Milky Way galaxy. Imprinted by the history of stellar emission, the EBL in the near infrared traces light back to the birth of the first stars in the Universe and can allow tight constraints on structure formation models. Recent studies using data from the Spitzer Space Telescope and the first Cosmic Infrared Background ExpeRiment (CIBER-1) find that there are excess fluctuations in the EBL on large scales which have been attributed to either high redshift galaxies and quasars, or to stars that were stripped from their host galaxies during merging events. To help disentangle these two models, multi-wavelength data can be used to trace their distinctive spectral features. Following the success of CIBER-1, CIBER-2 is designed to identify the sources of the EBL excess fluctuations using data in six wavebands covering the optical and near infrared. The experiment consists of a cryogenic payload and is scheduled to launch four times on a recoverable sounding rocket. CIBER-2 has a 28.5 cm telescope coupled with an optics system to obtain wide-field images in six broad spectral bands between 0.5 and 2.5 mu m simultaneously. The experiment uses 2048 x 2048 HAWAII-2RG detector arrays and a cryogenic star tracker. A prototype of the cryogenic star tracker is under construction for a separate launch to verify its performance and star tracking algorithm. The mechanical, optical, and electrical components of the CIBER-2 experiment will have been integrated into the payload by mid-2018. Here we present the final design of CIBER-2 and our team's instrument characterization efforts. The design and analysis of the optical focus tests will be discussed. We also report on the performance of CIBER-2 support systems, including the cooling mechanisms and deployable components. Finally, we outline the remaining tasks required to prepare the payload for launch.
  • Won-Kee Park, Seung-Cheol Bang, John Battle, James Bock, Asantha Cooray, Kenta Danbayashi, Ambar DeSantiago, Viktor Hristov, Tomoya Kojima, Phillip Korngut, Alicia Lanz, Dae-Hee Lee, Lunjun Liu, Jared Loewenthal, Peter Mason, Toshio Matsumoto, Shuji Matsuura, Chi H. Nguyen, Ryo Ohta, Dorin Patru, Mark Peyer, Kei Sano, Aoi Takahashi, Kohji Takimoto, Kohji Tsumura, Takehiko Wada, Shiang-Yu Wang, Yasuhiro Yamada, Michael Zemcov
    SPACE TELESCOPES AND INSTRUMENTATION 2018: OPTICAL, INFRARED, AND MILLIMETER WAVE 10698 2018年  
    Cosmic Infrared Background ExpeRiment-2 (CIBER-2) is an international project to make a rocket-borne measurement of the Cosmic Infrared Background (CIB) using three HAWAII-2RG image sensors. Since the rocket telemetry is unable to downlink all the image data in real time, we adopt an onboard data storage board for each sensor electronics. In this presentation, the development of the data storage board and the Ground Station Electronics (GSE) system for CIBER2 are described. We have fabricated, integrated, and tested all systems and confirmed that all work as expected, and are ready for flight.

MISC

 58
  • 玉井, 桃子, 松浦, 周二, 橋本, 遼, 中川, 智矢, 中畑, 秀太, 花井, 翔, 瀧本, 幸司, 佐野, 圭, 中川, 俊輔, 津村, 耕司, 高橋, 葵, 和田, 武彦, ZEMCOV, Michael, BOCK, James, CIBER-2 collaboration,
    観測ロケットシンポジウム2023 講演集 2024年2月  
    レポート番号: Ⅴ-3
  • TOME Yuto, SANO Kei, NAKAGAWA Shunsuke, KUROSAKI Kana, NISHIOKA Masahiro, MATSUURA Shuji, HIROSE Yuki, OJIKA Akimasa, TSUMOTO Akane, OHARA Yuki, NAKAGAWA Takao, TAKAHASHI Aoi, TAKIMOTO Kohji, TANAKA Hayato
    日本天文学会年会講演予稿集 2024 2024年  
  • HIROSE Yuki, MATSUURA Shuji, OJIKA Akimasa, TSUMOTO Akane, OHARA Yuki, SANO Kei, TOME Yuto, KAWASAKI Hisataka, NAKAGAWA Shunsuke, SATO Rin, HASHIMOTO Ryo, TSUMURA Kohji, NAKAGAWA Takao, TAKIMOTO Kohji, TAKAHASHI Aoi, TANAKA Hayato
    日本天文学会年会講演予稿集 2024 2024年  
  • TAKIMOTO Kohji, NAKAGAWA Takao, TAKAHASHI Aoi, TANAKA Hayato, SANO Kei, KAWASAKI Hisataka, TOME Yuto, NAKAGAWA Shunsuke, KUROSAKI Kana, SATO Rin, HASHIMOTO Ryo, MATSUURA Shuji, HIROSE Yuki, OJIKA Akimasa, TSUMOTO Akane, OHARA Yuki, TSUMURA Kohji
    日本天文学会年会講演予稿集 2024 2024年  
  • TAKAHASHI Aoi, TANAKA Hayato, YASUDA Yoshinao, TAKIMOTO Kohji, NAKAGAWA Takao, OJIKA Akimasa, TSUMOTO Akane, OHARA Yuki, HIROSE Yuki, MATSUURA Shuji, TOME Yuto, NISHIOKA Masahiro, NAKAGAWA Shunsuke, KUROSAKI Kana, SANO Kei
    日本天文学会年会講演予稿集 2024 2024年  

講演・口頭発表等

 7
  • 瀧本幸司
    2024年12月4日  招待有り
  • 瀧本幸司
    2024年12月3日  招待有り
  • 櫛引洸佑, 津村耕司, 東谷千比呂, 瀧本幸司, 大宮正士, 大金原
    2024年度光赤天連シンポジウム「光赤天連の長期的ロードマップおよび若手育成支援」 2024年9月19日 石垣美歩、栗田光樹夫、児玉忠恭、高田昌広、長尾透、橋本拓也、 本田充彦、本原顕太郎、吉田二美
    2024年度のシンポジウムでは「光赤天連の長期的ロードマップおよび若手育成支援」と題して、日本における光赤外天文学の将来設計のための議論を行う。 日本において光赤外天文学を推進する研究機関として中核を担うのは国立天文台と宇宙科学研究所であろう。 両機関が考える地上およびスペースから行う光赤外天文学の展望を両機関のトップをお招きし、2020年代、2030年代に実現すべきと考えている課題についてじっくり話を伺う。 現行プロジェクトの報告を聞き、海外の動向を共有し、光赤天連将来計画検討専門委員会の委員での検討状況の報告を聞く。 ロードマップに提案された個々の計画についての説明を聞く機会も設ける。 さらに、最近活発になってきた産業界の宇宙進出についてのセッションを設け、光赤天のコミュニティとどのように協力関係を構築できるか考える機会を設ける。 また、長期計画実現において若い戦力は欠かせないため、若手研究者が研究発表するセッションも設ける。 博士号を取ったばかりの研究者や今年度博士号を取る予定の学生が自身の研究を発表する場としていただく。 本シンポジウムは、今後の天文学の展望を共有し、光赤外天文学における日本のロードマップ策定について議論する場とする。
  • 瀧本幸司
    九州工業大学 GYMLABO 2024年5月7日  招待有り
  • 瀧本幸司, 佐野圭, 松浦周二, 橋本遼, 河野有哉, 松見知香, 中川智矢, 高濱伶緒, 中畑秀太, 津村耕司, Michael Zemcov(RIT, James Bock(Caltech/JPL, Daehee Lee(KASI, Shiang-Yu Wang(ASIAA, ほかCIBER-2チーム
    第11回 可視赤外線観測装置技術ワークショップ 2022 2022年12月22日

担当経験のある科目(授業)

 3

所属学協会

 2

共同研究・競争的資金等の研究課題

 4