The nature of the red disk-like galaxies at high redshift

Details The nature of the red disk-like galaxies at high redshift The nature of the red disk-like galaxies at high redshift

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..307p&link_type=abstract

In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A

Physics

Galaxies: High-Redshift, Galaxies: Spiral, Galaxies: Evolution, Galaxies: Stellar Content, Dust, Extinction, Radiative Transfer

Scientific paper

We investigate the nature of the disk-like galaxies with "red" colours (i.e. Ic-K > 4 or J-K > 2.3), discovered at redshift 0.7 < z < 3.2, by combining models of the radiative transfer of the stellar and scattered radiation through different dusty interstellar media together with stellar population evolutionary synthesis models. Reproducing the observed optical/near-infrared colours suggests that high-z, red disk-like galaxies have declining star-formation rates with e-folding times as short as ~3 Gyr. Being "red" does not necessarily imply having luminosity-weighted old (i.e. >1 Gyr) ages and/or being very dusty, since the contribution to the bolometric luminosity of the intermediate-age (i.e. between 0.2 and 1-2 Gyr) stellar populations is relevant.

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