Astronomy and Astrophysics – Astrophysics
Scientific paper
2000-09-29
Astrophys.J. 555 (2001) 641-649
Astronomy and Astrophysics
Astrophysics
final version with labled new fig. 3: ApJ, in press
Scientific paper
10.1086/321492
We predict luminosity functions and number counts for extragalactic infrared sources at various wavelengths using the framework of our empirically based model. Comparisons of our galaxy count results with existing data indicate that either galaxy luminosity evolution is not much stronger than Q=3.1, where L is proportional to (1+z)^{Q}, or that this evolution does not continue beyond a redshift of 2. However, a derivation of the far infrared background from COBE-DIRBE data suggests a stronger evolution for far infrared emission with Q > 4 in the redshift range beteen 0 and 1. We discuss several interpretations of these results and also discuss how future observations can reconcile this apparent conflict. We also make predictions of the redshift distributions of extragalactic infrared sources at selected flux levels which can be tested by planned detectors. Finally, we predict the fluxes at which various future surveys will become confusion limited.
Malkan Matthew A.
Stecker Floyd W.
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