The properties of 70micron selected high-redshift galaxies in the Extended Groth Strip

Details The properties of 70micron selected high-redshift galaxies in the Extended Groth Strip The properties of 70micron selected high-redshift galaxies in the Extended Groth Strip

2008-01-02

arxiv.org/abs/0801.0454v1

Astronomy and Astrophysics

Astrophysics

15 pages, 11 figures and 3 tables; accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.12899.x

We examine the infrared properties of 43 high redshift (0.135 and for a large fraction (~50 per cent) the SED turns over into the Rayleigh-Jeans regime at wavelengths longward of 90 microns. For comparison, we also fit semi-empirical templates based on local galaxy data, however, these underestimate the far-infrared SED shape by a factor of at least 2 and in extreme cases up to 10 for the majority (~70 per cent) of the sources. Further investigation of SED characteristics reveals that the mid-infrared (70/24 microns) continuum slope is decoupled from various galaxy properties such as the total infrared luminosity and far-infrared peak, quantified by the L_160/L_70 ratio. In view of these results, we propose that these high-redshift galaxies have different properties to their local counterparts, in the sense that large amounts of dust cause heavy obscuration and are responsible for an additional cold emissive component, appearing as a far-infrared excess in their SEDs.

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