The VLA-COSMOS 1.4 GHz Survey: The Properties of the Faint Radio Population and Star Formation Rates

Mathematics – Logic

Scientific paper

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

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.

No associations

LandOfFree

Say what you really think

Search LandOfFree.com for scientists and scientific papers. Rate them and share your experience with other people.

Rating

The VLA-COSMOS 1.4 GHz Survey: The Properties of the Faint Radio Population and Star Formation Rates does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with The VLA-COSMOS 1.4 GHz Survey: The Properties of the Faint Radio Population and Star Formation Rates, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The VLA-COSMOS 1.4 GHz Survey: The Properties of the Faint Radio Population and Star Formation Rates will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFWR-SCP-O-1158138

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.