The VLA-COSMOS Perspective Of The Radio-IR Relation At z < 1.5

Details The VLA-COSMOS Perspective Of The Radio-IR Relation At z < 1.5 The VLA-COSMOS Perspective Of The Radio-IR Relation At z < 1.5

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342425s&link_type=abstract

American Astronomical Society, AAS Meeting #213, #424.25; Bulletin of the American Astronomical Society, Vol. 41, p.250

Astronomy and Astrophysics

Astronomy

Scientific paper

In local star forming galaxies the radio-IR relation spans five orders of magnitude in luminosity. It defines one of the tightest relations in extragalactic astronomy and appears to hold out to redshift 2 to 3. However, its origin and the underlying physical processes are still being debated, as is the question of whether these processes are identical in the local and distant universe.
Because the radio-IR relation is commonly used as a tracer of obscured star formation in galaxies in a wide range of environments, it is vital to determine whether it holds out to high redshifts where the comoving cosmic star formation rate density peaks.
We present new work on the radio-IR relation based on a radio-selected (1.4 GHz) sample of more than 2500 galaxies with 0 < z < 1.5 in the COSMOS field. This VLA-COSMOS data set is combined with MIPS 24 and 70 micron data (providing accurate IR luminosities), as well as with spectroscopic (approx. 1000 objects) and precise photometric redshifts. The number of sources at z > 0.5 is significantly larger than in previous studies.
Using our unique sample we are able to show the first results on the (non-)evolution of the radio-IR relation as a function of redshift, host galaxy properties (e.g. mass, morphology) and environment, both for AGN and star forming galaxies.

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