The cosmic infrared background experiment

被引:27
作者
Bock, J
Battle, J
Cooray, A
Kawada, M
Keating, B
Lange, A
Lee, DH
Matsumoto, T
Matsuura, S
Pak, S
Renbarger, T
Sullivan, T
Tsumura, K
Wada, T
Watabe, T
机构
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[2] CALTECH, Dept Astron, Pasadena, CA 91125 USA
[3] Univ Calif Irvine, Irvine, CA 92697 USA
[4] Nagoya Univ, Chikusa Ku, Nagoya, Aichi 4648602, Japan
[5] Univ Calif San Diego, Dept Phys, La Jolla, CA 92093 USA
[6] Korea Astron & Space Sci Inst, Taejon 305348, South Korea
[7] JAXA, ISAS, Sagamihara, Kanagawa 2298510, Japan
基金
美国国家航空航天局;
关键词
extragalactic background; primordial galaxies; infrared;
D O I
10.1016/j.newar.2005.11.034
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
The extragalactic background, based on absolute measurements reported by DIRBE and IRTS at 1.2 and 2.2 mu m, exceeds the brightness derived from galaxy counts by up to a factor 5. Furthermore, both DIRBE and the IRTS report fluctuations in the near-infrared sky brightness that appear to have an extra-galactic origin, but are larger than expected from local (z = 1-3) galaxies. These observations have led to speculation that a new class of high-mass stars or mini-quasars may dominate primordial star formation at high-redshift (z similar to 10-20), which.. in order to explain the excess in the near-infrared background, must be highly luminous but produce a limited amount of metals and X-ray photons. Regardless of the nature of the sources, if a significant component of the near-infrared background comes from first-light galaxies, theoretical models generically predict a prominent near-infrared spectral feature from the redshifted Lyman cutoff, and a distinctive fluctuation power spectrum. We are developing a rocket-borne instrument (the Cosmic Infrared Background ExpeRiment, or CIBER) to search for signatures of primordial galaxy formation in the cosmic near-infrared extra-galactic background. CIBER consists of a wide-field two-color camera, a low-resolution absolute spectrometer, and a high-resolution narrow-band imaging spectrometer. The cameras will search for spatial fluctuations in the background on angular scales from 7 '' to 2 degrees, where a first-light galaxy signature is expected to peak, over a range of angular scales poorly covered by previous experiments. CIBER will determine if the fluctuations reported by the IRTS arise from first-light galaxies or have a local origin. In a short rocket flight CIBER has sensitivity to probe fluctuations 100x fainter than IRTS/DIRBE, with sufficient resolution to remove local-galaxy correlations. By jointly observing regions of the sky studied by Spitzer and ASTRO-F, CIBER will build a multi-color view of the near-infrared background, accurately assessing the contribution of local (7 = 1-3) galaxies to the observed background fluctuations, allowing a deep and comprehensive survey for first-light galaxy background fluctuations. The low-resolution spectrometer will search for a redshifted Lyman cutoff feature between 0.8 and 2.0 mu m. The high-resolution spectrometer will trace zodiacal light using the intensity of scattered Fraunhofer lines, providing an independent measurement of the zodiacal emission and a new check of DIRBE zodiacal dust models. The combination will systematically search for the infrared excess background light reported in near-infrared DIRBE/IRTS data, compared with the small excess reported at optical wavelengths. (c) 2005 Published by Elsevier B.V.
引用
收藏
页码:215 / 220
页数:6
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