Evolution of Dust Temperature of Galaxies through Cosmic Time as seen by Herschel

Details Evolution of Dust Temperature of Galaxies through Cosmic Time as seen by Herschel Evolution of Dust Temperature of Galaxies through Cosmic Time as seen by Herschel

2010-09-06

arxiv.org/abs/1009.1058v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

9 pages, 6 figures, To appear in MNRAS

Scientific paper

We study the dust properties of galaxies in the redshift range 0.10.5 with L_IR>5x10^{10} L_\odot, appears to be 2-5 K colder than that of AKARI-selected local galaxies with similar luminosities; and the dispersion in T_dust for high-z galaxies increases with L_IR due to the existence of cold galaxies that are not seen among local galaxies. We show that this large dispersion of the L_IR-T_dust relation can bridge the gap between local star-forming galaxies and high-z submillimeter galaxies (SMGs). We also find that three SMGs with very low T_dust (<20 K) covered in this study have close neighbouring sources with similar 24-\mum brightness, which could lead to an overestimation of FIR/(sub)millimeter fluxes of the SMGs.

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