研究者業績
基本情報
研究キーワード
4研究分野
1経歴
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2021年4月 - 現在
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2020年5月 - 2021年3月
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2017年10月 - 2020年4月
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2012年10月 - 2017年9月
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2010年6月 - 2012年9月
論文
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成蹊大学 教職課程年報 (33) 14-24 2024年3月 査読有り筆頭著者
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The Astrophysical Journal Supplement Series 267(10) 2023年7月 査読有り
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Bulletin of the American Astronomical Society 54(6) 2022年7月
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Bulletin of the American Astronomical Society 53(1) 2021年1月
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The Astronomical Journal 160(2) 87-87 2020年7月30日 査読有り筆頭著者
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Astronomical Data Analysis Software and Systems XXVI ASP Conference Series 523 601 2019年10月
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Astronomical Data Analysis Software and Systems XXVI ASP Conference Series 521 691 2019年10月
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Publications of the Astronomical Society of Japan 70(SP1) 2018年1月1日 査読有りThe Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a three-layered imaging survey aimed at addressing some of the most important outstanding questions in astronomy today, including the nature of dark matter and dark energy. The survey has been awarded 300 nights of observing time at the Subaru Telescope, and it started in 2014 March. This paper presents the first public data release of HSC-SSP. This release includes data taken in the first 1.7 yr of observations (61.5 nights), and each of the Wide, Deep, and UltraDeep layers covers about 108, 26, and 4 square degrees down to depths of i similar to 26.4, similar to 26.5, and similar to 27.0 mag, respectively (5 sigma for point sources). All the layers are observed in five broad bands (grizy), and the Deep and UltraDeep layers are observed in narrow bands as well. We achieve an impressive image quality of 0.'' 6 in the i band in the Wide layer. We show that we achieve 1%-2% point spread function (PSF) photometry (root mean square) both internally and externally (against Pan-STARRS1), and similar to 10 mas and 40 mas internal and external astrometric accuracy, respectively. Both the calibrated images and catalogs are made available to the community through dedicated user interfaces and database servers. In addition to the pipeline products, we also provide value-added products such as photometric redshifts and a collection of public spectro-scopic redshifts. Detailed descriptions of all the data can be found online. The data release website is https://hsc-release.mtk.nao.ac.jp.
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Publications of the Astronomical Society of Japan 70(SP1) 2018年1月1日 査読有りThe Hyper Suprime-Cam (HSC) is an 870 megapixel prime focus optical imaging camera for the 8.2 m Subaru telescope. The wide-field corrector delivers sharp images of 0.'' 2 (FWHM) in the HSC-i band over the entire 1.degrees 5 diameter field of view. The collimation of the camera with respect to the optical axis of the primary mirror is done with hexapod actuators, the mechanical accuracy of which is a few microns. Analysis of the remaining wavefront error in off-focus stellar images reveals that the collimation of the optical components meets design specifications. While there is a flexure of mechanical components, it also is within the design specification. As a result, the camera achieves its seeing-limited imaging on Maunakea during most of the time; the median seeing over several years of observing is 0.'' 67 (FWHM) in the i band. The sensors use p-channel, fully depleted CCDs of 200 mu m thickness (2048 x 4176 15 mu m square pixels) and we employ 116 of them to pave the 50 cm diameter focal plane. The minimum interval between exposures is 34 s, including the time to read out arrays, to transfer data to the control computer, and to save them to the hard drive. HSC on Subaru uniquely features a combination of a large aperture, a wide field of view, sharp images and a high sensitivity especially at longer wavelengths, which makes the HSC one of the most powerful observing facilities in the world.
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Publications of the Astronomical Society of Japan 70(SP1) 2018年1月1日 査読有りIn this paper, we describe the optical imaging data processing pipeline developed for the Subaru Telescope's Hyper Suprime-Cam (HSC) instrument. The HSC Pipeline builds on the prototype pipeline being developed by the Large Synoptic Survey Telescope's Data Management system, adding customizations for HSC, large-scale processing capabilities, and novel algorithms that have since been reincorporated into the LSST codebase. While designed primarily to reduce HSC Subaru Strategic Program (SSP) data, it is also the recommended pipeline for reducing general-observer HSC data. The HSC pipeline includes high-level processing steps that generate coadded images and science-ready catalogs as well as low-level detrending and image characterizations.
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Publications of the Astronomical Society of Japan 70(SP1) 2018年1月1日 査読有りHyper Suprime-Cam (HSC) is a wide-field imaging camera on the prime focus of the 8.2-m Subaru telescope on the summit of Mauna Kea in Hawaii. A team of scientists from Japan, Taiwan, and Princeton University is using HSC to carry out a 300-night multi-band imaging survey of the high-latitude sky. The survey includes three layers: the Wide layer will cover 1400 deg(2) in five broad bands (grizy), with a 5 sigma point-source depth of r approximate to 26. The Deep layer covers a total of 26 deg(2) in four fields, going roughly a magnitude fainter, while the UltraDeep layer goes almost a magnitude fainter still in two pointings of HSC (a total of 3.5 deg(2)). Here we describe the instrument, the science goals of the survey, and the survey strategy and data processing. This paper serves as an introduction to a special issue of the Publications of the Astronomical Society of Japan, which includes a large number of technical and scientific papers describing results from the early phases of this survey.
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The Astrophysical Journal Supplement Series 225(1) 11-11 2016年7月22日 査読有り
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The Astrophysical Journal 807(1) L2-L2 2015年6月24日 査読有り
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Observatory Operations: Strategies, Processes, and Systems V 9149 2014年8月25日Hyper Suprime-Cam (HSC) is the optical and near-infrared wide-field camera equipped on the Subaru Telescope. Its huge field of view (1.5 degree diameter) with 104 CCDs and the large mirror (8.2m) of the telescope will make us to study the Universe more efficiently. The analysis pipeline for ITSC data produces processed images, and object catalogs of each CCD and stacked images. For survey in next 5 years, the number of rows in the object catalog table will reach to at least 5 x 10(9). We show the outline of the database system of HSC data to store those huge data.
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Observatory Operations: Strategies, Processes, and Systems V 2014年8月6日
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Astronomical Data Analysis Software and Systems XXIII, ASP Conference Series 485 243 2014年5月Hyper Suprime-Cam (HSC) is the optical and near-infrared wide-field camera equipped on the Subaru Telescope. Its huge field of view (1.5 degree diameter) with 104 CCDs and the large mirror (8.2m) of the telescope will make us to study the Universe more efficiently. The analysis pipeline for ITSC data produces processed images, and object catalogs of each CCD and stacked images. For survey in next 5 years, the number of rows in the object catalog table will reach to at least 5 x 10(9). We show the outline of the database system of HSC data to store those huge data.
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ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS XXIII 485 297-300 2014年We describe a web-based user interface to retrieve Hyper Suprime-Cam data products, including images and catalogs. Users can access data directly from a graphical user interface or by writing a database SQL query. The system provides raw images, reduced images and stacked images (from multiple individual exposures), with previews available. Catalog queries can be executed in preview or queue mode, allowing for both exploratory and comprehensive investigations.
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Publications of the Astronomical Society of Japan 65(1) 22-22 2013年2月25日 査読有り
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Ground-based and Airborne Instrumentation for Astronomy IV 8446 2012年10月5日Hyper Suprime-Cam (HSC) is an 870 Mega pixel prime focus camera for the 8.2 m Subaru telescope. The wide field corrector delivers sharp image of 0.25 arc-sec FWHM in r-band over the entire 1.5 degree (in diameter) field of view. The collimation of the camera with respect to the optical axis of the primary mirror is realized by hexapod actuators whose mechanical accuracy is few microns. As a result, we expect to have seeing limited image most of the time. Expected median seeing is 0.67 arc-sec FWHM in i-band. The sensor is a p-ch fully depleted CCD of 200 micron thickness (2048 x 4096 15 mu m square pixel) and we employ 116 of them to pave the 50 cm focal plane. Minimum interval between exposures is roughly 30 seconds including reading out arrays, transferring data to the control computer and saving them to the hard drive. HSC uniquely features the combination of large primary mirror, wide field of view, sharp image and high sensitivity especially in red. This enables accurate shape measurement of faint galaxies which is critical for planned weak lensing survey to probe the nature of dark energy. The system is being assembled now and will see the first light in August 2012.
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The Astronomical Journal 144(2) 40-40 2012年8月1日 査読有り筆頭著者
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The Astrophysical Journal 688(2) 918-930 2008年12月 査読有り
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The Astronomical Journal 134(1) 56-63 2007年7月 査読有り筆頭著者
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Proceedings of the International Astronomical Union 2(S235) 257-257 2006年8月 筆頭著者<title>Abstract</title>We examine the galaxy luminosity functions (LFs) in the Hydra I cluster (Abell 1060) at <italic>z</italic> = 0.0126, for which very faint galaxies (down to <italic>M</italic> ~ −10) have not been surveyed yet. We conclude that the total LF has a slightly steep slope (α ~ −1.6) at −20 < <italic>M</italic> < −10 in the <italic>B</italic>- and <italic>RC</italic>-bands. The numbers of galaxies at the faint end (<italic>M</italic> ≳ −14) differ in between the cluster center and the outskirts slightly. We divide the Hydra member galaxies into red/blue galaxies and find that the shape of LFs in the faint magnitude range is determined by red dwarf galaxies.
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The Astrophysical Journal 620(1) L1-L4 2005年2月10日 査読有りWe report the discovery of primeval large- scale structures ( LSSs) including two protoclusters in a forming phase at. We carried out extensive deep narrowband imaging in the 1 deg(2) sky of the Subaru/ XMM- Newton Deep at z = 5.7 Field and obtained a cosmic map of 515 Lyalpha emitters ( LAEs) in a volume with a transverse dimension of and a depth of similar to 40 Mpc in comoving units. This cosmic map shows filamentary LSSs, including 180 Mpc x 180 Mpc clusters and surrounding 10 - 40 Mpc scale voids, similar to the present- day LSSs. Our spectroscopic follow- up observations identify overdense regions in which two dense clumps of LAEs with a sphere of 1 Mpc diameter in physical units are included. These clumps show about 130 times higher star formation rate density, mainly due to a large overdensity, similar to 80, of LAEs. These clumps would be clusters in a formation phase involving a burst of galaxy formation.
MISC
2講演・口頭発表等
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DENET 2011 Subaru Hyper Suprime-Cam Workshop 2011年3月
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