研究者詳細 - 佐野　圭

論文 - 佐野　圭

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High-redshift gamma-ray burst for unraveling the Dark Ages Mission - HiZ-GUNDAM - 国際誌

Yonetoku D., Mihara T., Doi A., Sakamoto T., Tsumura K., Ioka K., Amaya Y., Arimoto M., Enoto T., Fujii T., Goto H., Gunji S., Hiraga J., Ikeda H., Kawai N., Kurosawa S., Li J., Maeda Y., Mitsuishi I., Murakami T., Nakagawa Y., Ogino N., Ohno M., Sawano T., Sei K., Serino M., Sugita S., Tamagawa T., Tamura K., Tanaka T., Tanimori T., Tashiro M.S., Tomida H., Wang H., Yamaguchi T., Yamamoto A., Yamaoka K., Yamauchi M., Yatsu Y., Yoshida A., Yuhi D., Akitaya H., Fukui A., Ita Y., Kaneda H., Kawabata K., Kawata Y., Kurimata M., Matsumoto T., Matsuura S., Miyasaka A., Motohara K., Narita N., Noda H., Ohashi A., Okita H., Sano K., Tanaka M., Urata Y., Wada T., Yamaguchi H., Yanagisawa K., Yoshida M., Asano K., Inayoshi K., Inoue S., Ito H., Izumiura H., Kawanaka N., Kinugawa T., Kisaka S., Kiuchi K., Kyutoku K., Matsumoto J., Mizuta A., Murase K., Nagakura H., Nagataki S., Nakada Y., Nakamura T., Niino Y., Suwa Y., Takahashi K., Tanaka T., Toma K., Totani T., Yamazaki R., Yokoyama J.

Proceedings of SPIE - The International Society for Optical Engineering 11444 2020年12月

担当区分：責任著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

HiZ-GUNDAM is a future satellite mission which will lead the time-domain astronomy and the multi-messenger astronomy through observations of high-energy transient phenomena. A mission concept of HiZ-GUNDAM was approved by ISAS/JAXA, and it is one of the future satellite candidates of JAXA's medium-class mission. We are in pre-phase A (before pre-project) and elaborating the mission concept, mission/system requirements for the launch in the late 2020s. The main themes of HiZ-GUNDAM mission are (1) exploration of the early universe with high-redshift gamma-ray bursts, and (2) contribution to the multi-messenger astronomy. HiZ-GUNDAM has two kinds of mission payload. The wide field X-ray monitors consist of Lobster Eye optics array and focal imaging sensor, and monitor ~1 steradian field of view in 0.5 - 4 keV energy range. The near infrared telescope has an aperture size 30 cm in diameter, and simultaneously observes four wavelength bands between 0.5 - 2.5 µm. In this paper, we introduce the mission overview of HiZ-GUNDAM.

DOI： 10.1117/12.2560603

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MIRIS observation of near-infrared diffuse Galactic light 査読有り

Onishi Y., Sano K., Matsuura S., Jeong W.S., Pyo J., Kim I.J., Seo H.J., Han W., Lee D.H., Moon B., Park W., Park Y., Kim M.G., Matsumoto T., Matsuhara H., Nakagawa T., Tsumura K., Shirahata M., Arai T., Ienaka N.

Publications of the Astronomical Society of Japan 70 ( 4 ) 2018年08月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

© The Author(s) 2018. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. We report near-infrared (IR) observations of high Galactic latitude clouds to investigate diffuse Galactic light (DGL), which is starlight scattered by interstellar dust grains. The observations were performed at 1.1 and 1.6 μm with a wide-field camera instrument, the Multi-purpose Infra-Red Imaging System (MIRIS) onboard the Korean satellite STSAT-3. The DGL brightness is measured by correlating the near-IR images with a far-IR 100 μm map of interstellar dust thermal emission. The wide-field observation of DGL provides the most accurate DGL measurement achieved to-date. We also find a linear correlation between optical and near-IR DGL in the MBM32 field. To study interstellar dust properties in MBM32, we adopt recent dust models with and without μm-sized very large grains and predict the DGL spectra, taking into account the reddening effect of the interstellar radiation field. The result shows that the observed color of the near-IR DGL is closer to the model spectra without very large grains. This may imply that dust growth in the observed MBM32 field is not active owing to the low density of its interstellar medium.

DOI： 10.1093/pasj/psy070

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Integration and instrument characterization of the cosmic infrared background experiment 2 (CIBER-2) 査読有り

Nguyen C., Stewart B., Bang S., Bock J., Cooray A., Danbayashi K., Desantiago A., Hristov V., Kojima T., Korngut P., Kruse K., Lanz A., Lee D., Liu L., Loewenthal J., Mason P., Matsumoto T., Matsuura S., Ohta R., Pape C., Park W., Patru D., Parkus J., Sano K., Takahashi A., Peryer M., Takimoto K., Tsumura K., Wada T., Wang S., Yamada Y., Zemcov M.

Proceedings of SPIE - The International Society for Optical Engineering 10698 2018年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. 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 μm simultaneously. The experiment uses 2048 × 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.

DOI： 10.1117/12.2311595

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Development of data storage system and GSE for cosmic infrared background experiment 2 (CIBER-2) 査読有り

Park W.K., Bang S.C., Battle J., Bock J., Cooray A., Danbayashi K., Desantiago A., Hristov V., Kojima T., Korngut P., Lanz A., Lee D.H., Liu L., Loewenthal J., Mason P., Matsumoto T., Matsuura S., Nguyen C.H., Ohta R., Patru D., Peyer M., Sano K., Takahashi A., Takimoto K., Tsumura K., Wada T., Wang S.Y., Yamada Y., Zemcov M.

Proceedings of SPIE - The International Society for Optical Engineering 10698 2018年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. 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.

DOI： 10.1117/12.2313184

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Ultraviolet to optical diffuse sky emission as seen by the Hubble Space Telescope Faint Object Spectrograph 査読有り

Kawara K., Matsuoka Y., Sano K., Brandt T., Sameshima H., Tsumura K., Oyabu S., Ienaka N.

Publications of the Astronomical Society of Japan 69 ( 2 ) 2017年01月

担当区分：責任著者記述言語：英語掲載種別：研究論文（学術雑誌）

© The Author 2017. Published by Oxford University Press on behalf of the Astronomical Society of Japan. All rights reserved. We present an analysis of the blank-sky spectra observed with the Faint Object Spectrograph on board the Hubble Space Telescope. We study the diffuse sky emission from ultraviolet to optical wavelengths, which is composed of zodiacal light (ZL), diffuse Galactic light (DGL), and residual emission. The observations were performed towards 54 fields distributed widely over the sky, with spectral coverage from 0.2 to 0.7 μm. In order to avoid contaminating light from earthshine, we use the data collected only in orbital nighttime. The observed intensity is decomposed into the ZL, DGL, and residual emission, in eight photometric bands spanning our spectral coverage. We found that the derived ZL reflectance spectrum is flat in the optical, which indicates major contribution of C-type asteroids to the interplanetary dust (IPD). In addition, the ZL reflectance spectrum has an absorption feature at ∼0.3 μm. The shape of the DGL spectrum is consistent with those found in earlier measurements and model predictions. While the residual emission contains a contribution from the extragalactic background light, we found that the spectral shape of the residual looks similar to the ZL spectrum. Moreover, its optical intensity is much higher than that measured from beyond the IPD cloud by Pioneer 10/11, and also than that of the integrated galaxy light. These findings may indicate the presence of an isotropic ZL component, which is missed in the conventional ZL models.

DOI： 10.1093/pasj/psx003

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The cosmic infrared background experiment-2 (CIBER-2) for studying the near-infrared extragalactic background light 査読有り

Shirahata M., Arai T., Battle J., Bock J., Cooray A., Enokuchi A., Hristov V., Kanai Y., Kim M.G., Korngut P., Lanz A., Lee D.H., Mason P., Matsumoto T., Matsuura S., Morford T., Ohnishi Y., Park W.K., Sano K., Takeyama N., Tsumura K., Wada T., Wang S.Y., Zemcov M.

Proceedings of SPIE - The International Society for Optical Engineering 9904 2016年01月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

© 2016 SPIE. We present the current status of the Cosmic Infrared Background ExpeRiment-2 (CIBER-2) project, whose goal is to make a rocket-borne measurement of the near-infrared Extragalactic Background Light (EBL), under a collaboration with U.S.A., Japan, South Korea, and Taiwan. The EBL is the integrated light of all extragalactic sources of emission back to the early Universe. At near-infrared wavelengths, measurement of the EBL is a promising way to detect the diffuse light from the first collapsed structures at redshift zâ1/410, which are impossible to detect as individual sources. However, recently, the intra-halo light (IHL) model is advocated as the main contribution to the EBL, and our new result of the EBL fluctuation from CIBER-1 experiment is also supporting this model. In this model, EBL is contributed by accumulated light from stars in the dark halo regions of low- redshift (z<2) galaxies, those were tidally stripped by the interaction of satellite dwarf galaxies. Thus, in order to understand the origin of the EBL, both the spatial fluctuation observations with multiple wavelength bands and the absolute spectroscopic observations for the EBL are highly required. After the successful initial CIBER- 1 experiment, we are now developing a new instrument CIBER-2, which is comprised of a 28.5-cm aluminum telescope and three broad-band, wide-field imaging cameras. The three wide-field (2.3×2.3 degrees) imaging cameras use the 2K×2K HgCdTe HAWAII-2RG arrays, and cover the optical and near-infrared wavelength range of 0.5-0.9 μm, 1.0-1.4 μm and 1.5-2.0 μm, respectively. Combining a large area telescope with the high sensitivity detectors, CIBER-2 will be able to measure the spatial fluctuations in the EBL at much fainter levels than those detected in previous CIBER-1 experiment. Additionally, we will use a linear variable filter installed just above the detectors so that a measurement of the absolute spectrum of the EBL is also possible. In this paper, the scientific motivation and the expected performance for CIBER-2 will be presented. The detailed designs of the telescope and imaging cameras will also be discussed, including the designs of the mechanical, cryogenic, and electrical systems.

DOI： 10.1117/12.2229567

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MEASUREMENTS of the MEAN DIFFUSE GALACTIC LIGHT SPECTRUM in the 0.95-1.65 μm BAND from CIBER 査読有り

Arai T., Matsuura S., Bock J., Cooray A., Kim M., Lanz A., Lee D., Lee H., Sano K., Smidt J., Matsumoto T., Nakagawa T., Onishi Y., Korngut P., Shirahata M., Tsumura K., Zemcov M.

Astrophysical Journal 806 ( 1 ) 2015年06月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2015. The American Astronomical Society. All rights reserved. We report measurements of the diffuse galactic light (DGL) spectrum in the near-infrared, spanning the wavelength range 0.95-1.65 μm by the Cosmic Infrared Background ExpeRiment. Using the low-resolution spectrometer calibrated for absolute spectro-photometry, we acquired long-slit spectral images of the total diffuse sky brightness toward six high-latitude fields spread over four sounding rocket flights. To separate the DGL spectrum from the total sky brightness, we correlated the spectral images with a 100 μm intensity map, which traces the dust column density in optically thin regions. The measured DGL spectrum shows no resolved features and is consistent with other DGL measurements in the optical and at near-infrared wavelengths longer than 1.8 μm. Our result implies that the continuum is consistently reproduced by models of scattered starlight in the Rayleigh scattering regime with a few large grains.

DOI： 10.1088/0004-637X/806/1/69

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