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It is now well established that the star-formation activity of our Universe increased from the very early epochs, peaked around z=2, and then decreased by an order of magnitude until present age. However, the exact contribution of different galaxy populations to the total SFR budget is not yet well-defined. Further progress in this area requires both a better understanding (or calibration) of SFR tracers used as well as deep observations of such tracers. The international panchromatic Cosmic Evolution Survey (COSMOS), is the only single survey large enough to study the coupled evolution of the large-scale structure of the Universe, galaxies, star formation, and active galactic nuclei across cosmic time. The 2 sq deg area of sky covered by COSMOS has the most extensive set of multi-wavelength observations of any deep field sufficient to probe the high mass end of galaxy populations out to high redshift, spanning the entire electromagnetic spectrum from X-ray, UV, optical, infrared to the radio. In this talk I will cover two topics from my PhD work: 1) the evolution of galaxy opacity and dust distributions since z~1 and 2) the evolution of specific star formation since z~5 using radio continuum as a star formation rate tracer. |
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