Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8005s&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #80.05; Bulletin of the American Astronomical Society, V
Mathematics
Logic
Scientific paper
Radio observations have important advantages in determining the star formation history of the universe, in particular there is no need for uncertain dust-extinction corrections. Radio (synchrotron) emission at 1.4 GHz (20 cm) is dominated by the emission from active-galactic nuclei (AGN) and star-forming (SF) galaxies, hence a reliable SF/AGN separation is one of the main pre-requisites for a robust determination of star-formation rates utilizing radio-data. Although there have been suggestions that the faint end (below fluxes of 1 mJy) of the 1.4 GHz source counts may be dominated by SF galaxies, the exact composition of the faint radio population is still controversial. The VLA-COSMOS survey with 3,600 detected radio sources at 1.4 GHz, with 1.5" resolution and high sensitivity (rms = 10 micro Jy), provides enough targets to allow for a robust systematic characterization of the 'cosmological mix' of faint radio sources. Utilizing the entire COSMOS multi-wavelength (X-ray to radio) data set, we present a method that separates the radio population into SF galaxies and AGN. Our results indicate that SF galaxies are not the dominant radio population at faint flux densities (<1 mJy), but rather have a fairly constant contribution with decreasing fluxes. Selecting the SF galaxies within the VLA-COSMOS population, we derive their star formation rates and present the cosmic star-formation history out to z=1, for the first time based on radio observations of a large, contiguous field with unprecedented sensitivity.
Carilli Chris
Franzetti Paolo
Jahnke Knud
Martinez-Sansigre Alejo
Salvato Mara
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