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The cosmic infrared background experiment

Bock, James and Battle, John and Cooray, Asantha and Kawada, Misunobu and Keating, Brian and Lange, Andrew and Lee, Dae-Hea and Matsumoto, Toshio and Matsuura, Shuji and Pak, Soojong and Renbarger, Tom and Sullivan, Ian and Tsumura, Kohji and Wada, Takehiko and Watabe, Toyoki (2006) The cosmic infrared background experiment. New Astronomy Reviews, 50 (1-3). pp. 215-220. ISSN 1387-6473.

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The extragalactic background, based on absolute measurements reported by DIRBE and IRTS at 1.2 and 2.2 µm, 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 ~ 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°, 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 (z = 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 µm. 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Bock, James0000-0002-5710-5212
Cooray, Asantha0000-0002-3892-0190
Matsumoto, Toshio0000-0001-6066-5221
Matsuura, Shuji0000-0002-5698-9634
Additional Information:© 2005 Published by Elsevier B.V. Available online 3 February 2006. The authors wish to acknowledge the support of NASA Grant NNG05WC18G.
Funding AgencyGrant Number
Subject Keywords:Extragalactic background; Primordial galaxies; Infrared
Issue or Number:1-3
Record Number:CaltechAUTHORS:20110120-144321793
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Official Citation:James Bock, John Battle, Asantha Cooray, Mitsunobu Kawada, Brian Keating, Andrew Lange, Dae-Hea Lee, Toshio Matsumoto, Shuji Matsuura, Soojong Pak, Tom Renbarger, Ian Sullivan, Kohji Tsumura, Takehiko Wada, Toyoki Watabe, The cosmic infrared background experiment, New Astronomy Reviews, Volume 50, Issues 1-3, First Light and Reionization: Theoretical Study and Experimental Detection of First Luminous Sources in the Universe, March 2006, Pages 215-220, ISSN 1387-6473, DOI: 10.1016/j.newar.2005.11.034. (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21838
Deposited By: Benjamin Perez
Deposited On:20 Jan 2011 23:28
Last Modified:09 Mar 2020 13:19

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