Specific star-formation and the relation to stellar mass from 0<z<2 as seen in the far-infrared at 70 and 160mu - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




Specific star-formation and the relation to stellar mass from 0<z<2 as seen in the far-infrared at 70 and 160mu - Astrophysics > Cosmology and Nongalactic Astrophysics - Download this document for free, or read online. Document in PDF available to download.

Abstract: We use the Spitzer Wide-area InfraRed Extragalactic Legacy Survey SWIRE toexplore the specific star-formation activity of galaxies and their evolutionnear the peak of the cosmic far-infrared FIR background at 70 and 160um. Weuse a stacking analysis to determine the mean FIR properties of well definedsubsets of galaxies at flux levels well below the FIR catalogue detectionlimits of SWIRE and other Spitzer surveys. We tabulate the contribution ofdifferent subsets of galaxies to the FIR background at 70um and 160um. Theselong wavelengths provide a good constraint on the bolometric, obscuredemission. The large area provides good constraints at low z and in finerredshift bins than previous work. At all redshifts we find that the specificFIR Luminosity sLFIR decreases with increasing mass, following a trendL FIR-M* propto M * ^beta with beta =-0.38\pm0.14. This is a more continuouschange than expected from the {Delucia2007} semi-analytic model suggestingmodifications to the feedback prescriptions. We see an increase in the sLFIR byabout a factor of ~100 from 0




Author: Seb Oliver, M. Frost, D. Farrah, E. Gonzalez-Solares, D.L. Shupe, B. Henriques, I. Roseboom, A. Afonso Luis, T.S.R. Babbedge, D.

Source: https://arxiv.org/



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