Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published January 2011 | Published
Journal Article Open

The cosmic far-infrared background buildup since redshift 2 at 70 and 160 microns in the COSMOS and GOODS fields

Abstract

Context. The cosmic far-infrared background (CIB) at wavelengths around 160 μm corresponds to the peak intensity of the whole extragalactic background light, which is being measured with increasing accuracy. However, the build up of the CIB emission as a function of redshift is still not well known. Aims. Our goal is to measure the CIB history at 70 μm and 160 μm at different redshifts, and provide constraints for infrared galaxy evolution models. Methods. We used deep Spitzer 24 μm catalogs complete to about 80 μJy with spectroscopic and photometric redshift identifications, derived using the GOODS and COSMOS deep infrared surveys covering 2 square degrees total. After cleaning the Spitzer/MIPS 70 μm and 160 μm maps of detected sources, we stacked the far-IR images at the positions of the 24 μm sources in different redshift bins.We measured the contribution of each stacked source to the total 70 and 160 μm light, and compared with model predictions and far-IR measurements obtained for Herschel/PACS data of smaller fields. Results. We detect components of the 70 and 160 μm backgrounds in different redshift bins up to z ~ 2. The contribution to the CIB reaches a maximum at 0.3 ≤ z ≤ 0.9 at 160 μm (and z ≤ 0.5 at 70 μm). A total of 81% (74%) of the 70 (160) μm background was emitted at z < 1. We estimate that the AGN contribution to the far-IR CIB is less than about 10% at z < 1.5. We provide a comprehensive view of the CIB buildup at 24, 70, 100 and 160 μm. Conclusions. We find that IR galaxy models predicting a major contribution to the CIB from sources at z < 1 agree with our measurements, while our results exclude other models that predict a peak of the background at higher redshifts. The consistency of our results with those obtained by the direct study of Herschel far-IR data at 160 μm confirms that the stacking analysis method is a valid approach to estimate the components of the far-IR background using prior information about resolved mid-IR sources.

Additional Information

© 2010 ESO. Received 19 July 2010, Accepted 31 August 2010, Published online 01 December 2010. Part of this work was supported by the D-SIGALE ANR- 06-BLAN-0170 and the HUGE ANR-09-BLAN-0224-02. M. J. thanks the "Matière Interstellaire et Cosmologie" group at IAS and the CNRS for the funding. K. C. acknowledges founding from a Leverhulme Trust Early Career Fellowship. We thank S. Berta for providing us with an electronic form of his latest Herschel/PACS PEP published results, and D. Le Borgne and E. Valiante for the public access to their models. We thank D. Elbaz, E. Daddi, B. Magnelli, and R.-R. Chary for fruitful discussions. In memoriam, Pr. Ph. Jauzac (August 29th, 1948 – October 22nd, 2009) (M. J.).

Attached Files

Published - Jauzac2011p12442Astron_Astrophys.pdf

Files

Jauzac2011p12442Astron_Astrophys.pdf
Files (613.4 kB)
Name Size Download all
md5:81e4709f44aedd595a5b9454e38d4803
613.4 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 23, 2023