Spitzer Mid-to-Far-Infrared Flux Densities of Distant Galaxies

Details Spitzer Mid-to-Far-Infrared Flux Densities of Distant Galaxies Spitzer Mid-to-Far-Infrared Flux Densities of Distant Galaxies

May 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...210.0813p&link_type=abstract

American Astronomical Society Meeting 210, #08.13; Bulletin of the American Astronomical Society, Vol. 39, p.105

Astronomy and Astrophysics

Astronomy

Scientific paper

We study the 24, 70, and 160 μm properties of high-redshift galaxies. Our primary interest is to improve the constraints on the total infrared (IR) luminosities, L(IR), of these galaxies. We combine Spitzer data in the southern Extended Chandra Deep Field with a Ks-band-selected galaxy sample with photometric redshifts from the Multiwavelength Survey by Yale-Chile. We used a stacking analysis to measure the average 70 and 160 μm flux densities of 1.5 < zph < 2.5 galaxies as a function of 24 μm flux density, X-ray activity, and rest-frame near-IR color. Galaxies with 1.5 < zph < 2.5 and S(24) = 54-250 μJy have L(IR) derived from their average 24-160 μm flux densities within factors of 2-3 of those derived from the 24 μm flux densities only. However, L(IR) derived from the average 24-160 μm flux densities for galaxies with S(24) > 250 μJy and 1.5 < zph < 2.5 are lower than those derived using only the 24 μm flux density by factors of 2-6. Galaxies with S(24) > 250 μJy have S(70)/S(24) flux ratios comparable to sources with X-ray detections or red rest-frame IR colors, suggesting that warm dust possibly heated by AGN produces high 24 μm emission. Based on the average 24-160 μm flux densities, 24 μm-selected galaxies at 1.5 < zph < 2.5 have an upper envelope of L(IR) < 6 × 1012 L&sun;, which if attributed to star formation corresponds to < 1000 M&sun; yr-1. This envelope is similar to the maximal star formation rate observed in low redshift galaxies, suggesting that high redshift galaxies have star formation efficiencies and feedback processes comparable to lower redshift analogs.
Support for this work was provided by NASA through the Spitzer Space Telescope Fellowship Program, through a contract issued by JPL, Caltech under a contract with NASA.

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