Galaxies 09: Assembly, Gas Content and Star Formation History of Galaxies

Jeyhan Kartaltepe
University of Hawaii

Multiwavelength Properties of 70 micron Selected Galaxies in the COSMOS Field

We present the results of a multiwavelength study of a complete sample of 1507 70 micron selected galaxies in the COSMOS field. We have obtained an accurate measure of the total infrared luminosity by fitting various template libraries to the mid to far infrared spectral energy distribution and discuss the variations in the full SED shape from the ultraviolet to the far infrared. We identify potential AGN using several different methods and find that the fraction of 70 micron sources that host powerful AGN increases strongly with $L_{IR}$. The morphological properties of these sources indicate that the fraction of major mergers also increases with luminosity while the fraction of spirals drops. Their U-V colors show that they reside in the "green valley" in between the blue cloud of star forming galaxies and the red sequence of quiescent ellipticals suggesting that they represent a significant transition population.

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