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The Cosmic Infrared Background at 1.25 and 2.2 Microns Using DIRBE and 2MASS: A Contribution Not Due to Galaxies?

Cambrésy, L. and Reach, W. T. and Beichman, C. A. and Jarrett, T. H. (2001) The Cosmic Infrared Background at 1.25 and 2.2 Microns Using DIRBE and 2MASS: A Contribution Not Due to Galaxies? Astrophysical Journal, 555 (2). pp. 563-571. ISSN 0004-637X. doi:10.1086/321470.

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Using the 2MASS second incremental data release and the zodiacal subtracted mission average maps of COBE/DIRBE, we estimate the cosmic background in the J (1.25 μm) and K (2.2 μm) bands using selected areas representing ~550 deg^2 of sky. We find a J background of 22.9 ± 7.0 kJy sr^(-1) (54.0 ± 16.8 nW m^(-2) sr^(-1)) and a K background of 20.4 ± 4.9 kJy sr^(-1) (27.8 ± 6.7 nW m^(-2) sr^(-1)). This large-scale study shows that the main uncertainty comes from the residual zodiacal emission. The cosmic background we obtain is significantly higher than integrated galaxy counts (3.6 ± 0.8 kJy sr^(-1) and 5.3 ± 1.2 kJy sr^(-1) for J and K, respectively), suggesting either an increase of the galaxy luminosity function for magnitudes fainter than 30 mag or the existence of another contribution to the cosmic background from primeval stars, black holes, or relic particle decay.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Reach, W. T.0000-0001-8362-4094
Beichman, C. A.0000-0002-5627-5471
Jarrett, T. H.0000-0002-4939-734X
Additional Information:© 2001. The American Astronomical Society. Received 2000 September 20; accepted 2001 March 6. We are grateful to Roc Cutri for his help in accessing the 2MASS data and for his critical reading of this paper and to George Helou for helpful discussions. This publication makes use of data products from 2MASS, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by NASA and NSF. The COBE data sets were developed by the NASA Goddard Space Flight Center under the guidance of the COBE Science Working Group and were provided by the NSSDC. L. Cambrésy acknowledges partial support from the Lavoisier grant of the French Ministry of Foreign Affairs.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Ministre de l'Europe et des Affaires étrangèresUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20170408-171320819
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Official Citation:L. Cambrésy et al 2001 ApJ 555 563
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76306
Deposited By: 1Science Import
Deposited On:12 Mar 2018 23:36
Last Modified:15 Nov 2021 16:59

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