研究者詳細 - 佐野　圭

論文 - 佐野　圭

分割表示34 件中 21 - 34 件目／全件表示 >>

CubeSat による宇宙可視光背景放射観測ミッション：VERTECS

佐野圭, 趙孟佑, 北村健太郎, 寺本万里子, 増井博一, 布施哲人, 瀧本幸司, ORGER Necmi, CORODOVA-Alagon Jose Rodrigo, SCHULZ Victor Hugo, AMPADU Ofosu Joseph, 中川貴雄, 宮崎康行, 松原英雄, 和田武彦, 磯部直樹, 船瀬龍, 津村耕司, 松浦周二, 高橋葵, 五十里哲, 谷津陽一, 軸屋一郎, 青柳賢英

第23回宇宙科学シンポジウム講演集 ( 宇宙航空研究開発機構宇宙科学研究所(JAXA)(ISAS) ) 2023年01月

Polarization Spectrum of Near-Infrared Zodiacal Light Observed with CIBER 査読有り国際誌

Takimoto K., Arai T., Matsuura S., Bock J.J., Cooray A., Feder R.M., Korngut P.M., Lanz A., Lee D.H., Matsumoto T., Nguyen C.H., Onishi Y., Sano K., Shirahata M., Takahashi A., Tsumura K., Zemcov M.

Astrophysical Journal 926 ( 1 ) 2022年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

We report the first measurement of the zodiacal light (ZL) polarization spectrum in the near-infrared between 0.8 and 1.8 μm. 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 ∼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.

DOI： 10.3847/1538-4357/ac416f

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Inferred Measurements of the Zodiacal Light Absolute Intensity through Fraunhofer Absorption Line Spectroscopy with CIBER 査読有り国際誌

Korngut P.M., Kim M.G., Arai T., Bangale P., Bock J., Cooray A., Cheng Y.T., Feder R., Hristov V., Lanz A., Lee D.H., Levenson L., Matsumoto T., Matsuura S., Nguyen C., Sano K., Tsumura K., Zemcov M.

Astrophysical Journal 926 ( 2 ) 2022年02月

記述言語：英語掲載種別：研究論文（学術雑誌）

Scattered sunlight from the interplanetary dust (IPD) cloud in our solar system presents a serious foreground challenge for spectrophotometric measurements of the extragalactic background light (EBL). In this work, we report on inferred measurements of the absolute intensity of the zodiacal light (ZL) using the novel technique of Fraunhofer line spectroscopy on the deepest 8542 Å line of the near-infrared Ca ii absorption triplet. The measurements are performed with the narrow band spectrometer (NBS) on board the Cosmic Infrared Background Experiment sounding rocket instrument. We use the NBS data to test the accuracy of two ZL models widely cited in the literature, the Kelsall and Wright models, which have been used in foreground removal analyses that produce high and low EBL results respectively. We find a mean reduced χ 2 = 3.5 for the Kelsall model and χ 2 = 2.0 for the Wright model. The best description of our data is provided by a simple modification to the Kelsall model, which includes a free ZL offset parameter. This adjusted model describes the data with a reduced χ 2 = 1.5 and yields an inferred offset amplitude of 46 ± 19 nW m-2 sr-1 extrapolated to 12500 Å. These measurements elude to the potential existence of a dust cloud component in the inner solar system whose intensity does not strongly modulate with the Earth's motion around the Sun.

DOI： 10.3847/1538-4357/ac44ff

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Probing Intra-Halo Light with Galaxy Stacking in CIBER Images 査読有り国際誌

Yun-Ting Cheng, Toshiaki Arai, Priyadarshini Bangale, James J. Bock, Tzu-Ching Chang, Asantha Cooray, Richard M. Feder, Phillip M. Korngut, Dae Hee Lee, Lunjun Liu, Toshio Matsumoto, Shuji Matsuura, Chi H. Nguyen, Kei Sano, Kohji Tsumura, Michael Zemcov

THE ASTROPHYSICAL JOURNAL 919 ( 2 ) 69 2021年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

We study the stellar halos of 0.2 ≲ z ≲ 0.5 galaxies with stellar masses spanning M ∗ ∼ 1010.5 to 1012 M o˙ (approximately L ∗ galaxies at this redshift) using imaging data from the Cosmic Infrared Background Experiment (CIBER). A previous CIBER fluctuation analysis suggested that intra-halo light (IHL) contributes a significant portion of the near-infrared extragalactic background light (EBL), the integrated emission from all sources throughout cosmic history. In this work, we carry out a stacking analysis with a sample of ∼30,000 Sloan Digital Sky Survey (SDSS) photometric galaxies from CIBER images in two near-infrared bands (1.1 and 1.8 μm) to directly probe the IHL associated with these galaxies. We stack galaxies in five sub-samples split by brightness and detect an extended galaxy profile beyond the instrument point-spread function (PSF) derived by stacking stars. We jointly fit a model for the inherent galaxy light profile plus large-scale one- and two-halo clustering to measure the extended galaxy IHL. We detect nonlinear one-halo clustering in the 1.8 μm band at a level consistent with numerical simulations. By extrapolating the fraction of extended galaxy light we measure to all galaxy mass scales, we find ∼30%/15% of the total galaxy light budget from galaxies is at radius r > 10/20 kpc, respectively. These results are new at near-infrared wavelengths at the L ∗ mass scale and suggest that the IHL emission and one-halo clustering could have appreciable contributions to the amplitude of large-scale EBL background fluctuations.

DOI： 10.3847/1538-4357/ac0f5b

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Development of an optical and near-infrared telescope onboard the HiZ-GUNDAM mission 査読有り国際誌

Tsumura K., Yonetoku D., Kawabata K., Matsuura S., Noda H., Urata Y., Niino Y., Sano K., Ohashi A., Doi A., Akitaya H., Miyasaka A., Kurimata M., Kawata Y., Arimoto M., Okita H.

Proceedings of SPIE - The International Society for Optical Engineering 11443 2020年12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 HiZ-GUNDAM (high-z Gamma-ray bursts for UNraveling the Dark Ages Mission) is a time-domain and multi-messenger astronomy mission by monitoring high-energy astronomical transient events such as gamma-ray bursts (GRBs). The HiZ-GUNDAM is designed to provide alerts of high-redshift GRBs with an ultra-wide field X-ray monitor and a co-onboard 30-cm telescope for immediate photometric follow-up observations in the visible and near-infrared. The HiZ-GUNDAM satellite automatically changes its attitude toward the discovered transient object, starts the follow-up observations with the telescope, and sends alert information including the detailed position, the apparent magnitude and photometric redshift of the transient object within one hour. This mission was selected as one of the mission concept candidates of the competitively-chosen medium-class mission of ISAS/JAXA in the mid-2020s. The basic design of the breadboard model of the telescope is undergoing, and the verification plan of it is studied. The optics are cooled down to 200 K by radiation cooling, and infrared detectors are additionally cooled down to 120 K by a mechanical cooler. All mirrors in the telescope are made of the same aluminum-alloy to reduce the alignment errors during cooling. The four-band simultaneous observation is realized by three beam splitters. The HgCdTe and HyViSi detectors are installed in this telescope. Basic technologies for these specifications are demonstrated by our other missions. In addition, the onboard detection algorithm of high-redshift GRBs by distinguishing them from nearby dusty galaxies in the orbit is also studied. In this paper, we introduce the current status of the development of the telescope onboard HiZ-GUNDAM.

DOI： 10.1117/12.2560654

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Pre-flight optical test and calibration for the Cosmic Infrared Background ExpeRiment 2 (CIBER-2) 査読有り国際誌

Takimoto K., Bang S.C., Bangale P., Bock J.J., Cooray A., Danbayashi K., Feder R.M., Furutani M., Gates K., Hashimoto R., Hristov V., Kida A., Korngut P., Lanz A., Lee D.H., Liu L., Mason P., Matsumoto T., Matsuura S., Morgan J.A., Nguyen C.H., Park W.K., Patru D., Parkus J., Sakai S., Sano K., Suzuki H., Takahashi A., Tatsu S., Tsumura K., Wada T., Wang S.Y., Yamada Y., Zemcov M.

Proceedings of SPIE - The International Society for Optical Engineering 11443 2020年12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 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.

DOI： 10.1117/12.2561917

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Development of EXo-Zodiacal Infrared Telescope (EXZIT) for observation of visible and near-infrared extragalactic background light 査読有り国際誌

Sano K., Matsuura S., Tsumura K., Takahashi A., Hashimoto R., Ogura S., Yomo K., Yasutake H., Ino Y., Tanaka R.

Proceedings of SPIE - The International Society for Optical Engineering 11443 2020年12月

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

© COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only. Extragalactic background light (EBL) consists of entire radiation emitted throughout the cosmic history and is one crucial observable quantity to study astrophysics in the early universe, such as first stellar objects or primordial black holes. In the visible and near-infrared, zodiacal light (ZL), sunlight scattered by interplanetary dust, is the brightest foreground for observer in the near-earth orbit and its uncertainty limits accuracy of the EBL measurement. To overcome this problem, observations from heliocentric distance beyond 5 au, where the ZL is negligible, is promising. To achieve the EBL observation in deep space, we have been developing EXo- Zodiacal Infrared Telescope (EXZIT) onboard a solar sail spacecraft to Jovian Trojans planned in Japan around 2030. According to our mission study, a three-mirror reflective telescope optics design with a 90mm × 50mm effective aperture and 16 deg × 8 deg field of view (FoV) followed by a focal plane array HAWAII-2RG with a linear variable filter makes available to detect the EBL at high significance in 0.4-1.6 μm with specific wavelength resolution of ∼20. In the present study, we develop test optics to demonstrate optical performance in room temperature for the future observation. By adopting only mirrors of aspherical surface, we design the optics whose aberration is minimized to show point spread function (PSF) of approximately 3 pix × 3 pix on the focal plane. The mirrors are fabricated by machining aluminum alloy A6061 with a honeycomb processing on the back surface to reduce the mirror mass. After integrating and aligning the mirrors with support jigs, we measure the PSF on the focal plane by a visible camera by inserting collimated beam of different angle of incidence, covering the whole FoV. We evaluate the PSF size by analyzing encircled energy in comparison with that expected from the ray-trace simulation of the optics. Throughout the FoV of the optics, the measured PSF size is comparable to the simulation. The present study demonstrates the precision machining of the aspherical mirrors and the optical performance of the designed optics. As a next step, we plan to develop thermal structure of EXZIT to demonstrate the optical performance in low temperature.

DOI： 10.1117/12.2559169

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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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