The nature of the red disk-like galaxies at high redshift: dust attenuation vs. intrinsically red stellar populations

Details The nature of the red disk-like galaxies at high redshift: dust attenuation vs. intrinsically red stellar populations The nature of the red disk-like galaxies at high redshift: dust attenuation vs. intrinsically red stellar populations

Apr 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..761..313p&link_type=abstract

THE SPECTRAL ENERGY DISTRIBUTIONS OF GAS-RICH GALAXIES: Confronting Models with Data; International Workshop. AIP Conference Pr

Physics

1

Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Interstellar Dust Grains, Diffuse Emission, Infrared Cirrus, Stellar Content And Populations, Radii, Morphology And Overall Structure

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 radiative transfer of the stellar and scattered radiation through different dusty interstellar media 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. In particular, this is due to the thermally pulsating Asymptotic-Giant-Branch stars, with intrinsically red rest-frame V - K colours. The winds of these intermediate-age stars are expected to contribute substantially to the enrichment of the interstellar medium of their host disk-like galaxy with carbonaceous dust (e.g. the Policyclic Aromatic Hydrocarbons). Finally, our models of dusty, star-forming disks barely show Rc - K > 5.3, and only for an extremely limited region of the explored parameter space, whatever their redshift. Hence, Rc - K-selected galaxies at 0.7 < z < 3.2 most probably are either systems with a bulge (and, thus, potential hosts of an active galactic nucleus), maybe old and passively evolving, or starbursts/mergers.

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