1210.1035 (Georgios E. Magdis et al.)

The Evolving Interstellar Medium of Star Forming Galaxies Since z=2 as Probed by Their Infrared Spectral Energy Distributions    [PDF]

Georgios E. Magdis, E. Daddi, M. Bethermin, M. Sargent, D. Elbaz, M. Pannella, M. Dickinson, H. Dannerbauer, E. Da Cunha, F. Walter, D. Rigopoulou, V. Charmandaris, H. -S. Hwang, J. Kartaltepe

Using data from the mid-infrared to millimeter wavelengths for individual galaxies and for stacked ensembles at 0.5, which is proportional to the dust mass weighted luminosity (LIR/Mdust), and the primary parameter defining the shape of the SED, is equivalent to SFE/Z. For MS galaxies we measure this quantity, , showing that it does not depend significantly on either the stellar mass or the sSFR. This is explained as a simple consequence of the existing correlations between SFR-M*, M*-Z and Mgas-SFR. Instead, we show that (or LIR/Mdust) does evolve, with MS galaxies having harder radiation fields and thus warmer temperatures as redshift increases from z=0 to 2, a trend which can also be understood based on the redshift evolution of the M*-Z and SFR-M* relations. These results motivate the construction of a universal set of SED templates for MS galaxies which vary as a function of redshift with only one parameter, .

View original: http://arxiv.org/abs/1210.1035