/ftp/cats/aliases/K/./KSL2010_2_



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J/ApJ/721/98        Morphology of 70um COSMOS galaxies       (Kartaltepe+, 2010)
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Beginning of ReadMe : J/ApJ/721/98 Morphology of 70um COSMOS galaxies (Kartaltepe+, 2010) ================================================================================ A multiwavelength study of a sample of 70 mum selected galaxies in the COSMOS field. II. The role of mergers in galaxy evolution. Kartaltepe J.S., Sanders D.B., Le Floc'h E., Frayer D.T., Aussel H., Arnouts S., Ilbert O., Salvato M., Scoville N.Z., Surace J., Yan L., Capak P., Caputi K., Carollo C.M., Cassata P., Civano F., Hasinger G., Koekemoer A.M., Le Fevre O., Lilly S., Liu C.T., McCracken H.J., Schinnerer E., Smolcic V., Taniguchi Y., Thompson D.J., Trump J., Baldassare V.F., Fiorenza S.L. <Astrophys. J., 721, 98-123 (2010)> =2010ApJ...721...98K ================================================================================ ADC_Keywords: Galaxies, IR ; Redshifts ; Morphology ; Surveys Keywords: cosmology: observations - galaxies: active - galaxies: evolution - galaxies: high-redshift - infrared: galaxies - surveys Abstract: We analyze the morphological properties of a large sample of 1503 70um selected galaxies in the COSMOS field spanning the redshift range 0.01<z<3.5 with a median redshift of 0.5 and an infrared luminosity range of 10^8^<L_IR_(8-1000um)<10^14^L_sun_ with a median luminosity of 10^11.4^L_sun_. In general, these galaxies are massive, with a stellar mass range of 10^10^-10^12^M_sun_, and luminous, with -25<M_K_<-20. The precise fraction of mergers in any given L_IR_ bin varies by redshift due to sources at z>1 being difficult to classify and subject to the effects of bandpass shifting; therefore, these numbers can only be considered lower limits. At z<1, where the morphological classifications are most robust, major mergers clearly dominate the ULIRG population ( 50%-80%) and are important for the LIRG population ( 25%-40%). At z>1, the fraction of major mergers is lower, but is at least 30%-40% for ULIRGs. In a comparison of our visual classifications with several automated classification techniques we find general agreement; however, the fraction of identified mergers is underestimated due to automated classification methods being sensitive to only certain timescales of a major merger. The distribution of the U-V color of the galaxies in our sample peaks in the green valley (<U-V>=1.1) with a large spread at bluer and redder colors and with the major mergers peaking more strongly in the green valley than the rest of the morphological classes. Description: The 70um sample used in this study was selected from the Spitzer-MIPS coverage of the COSMOS field taken during cycles 2 and 3. The main optical imaging data used for this study were obtained as a part of the COSMOS Treasury project with HST using the Advanced Camera for Surveys (ACS) and the F814W filter (FWHM=0.09").