Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pgqa.conf..442l&link_type=abstract
Probing Galaxies through Quasar Absorption Lines, IAU Colloquium Proceedings of the International Astronomical Union 199, held M
Astronomy and Astrophysics
Astronomy
Scientific paper
A sample of distant (z>0.4) luminous infrared galaxies (lirgs) selected from isocam deep survey fields (cfrs, udsr, udsf) have been studied on the basis of their high-quality optical spectra from VLT/fors2 (r=5å). Robust estimates of dust extinction can be considered via the energy balance between the infrared and hβ luminosities, after correcting the underlying balmer absorption properly. Oxygen abundances [12+log(o/h)] in the interstellar medium of the sample galaxies estimated from the "strong-line" method show a range from 8.36 to 8.93, with a median value of 8.67, which is 0.5 lower than that of local bright disks (i.e. l*) at the given magnitude. The timescale to double the stellar masses of such lirgs can be very short, 0.1-1 gyr. A significant fraction of distant large disks are indeed lirgs. Such massive disks could have formed ˜50% of their metals and stellar masses since z˜1.
Cesarsky Catherine J.
Deng Li Cai
Elbaz David
Flores Hector
Hammer Francçois
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