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The metallicities of Luminous Infrared Galaxies at $z\sim 0.7$, hints to the evolution of galaxies

Published online by Cambridge University Press:  06 October 2005

Y. C. Liang ,
F. Hammer ,
H. Flores ,
D. Elbaz ,
X. Z. Zheng ,
L. C. Deng ,
D. Marcillac  and
C. J. Cesarsky
Y. C. Liang
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, P.R. China, email: [email protected] GEPI, Observatoire de Paris-Meudon, 92195 Meudon, France
F. Hammer
Affiliation:
GEPI, Observatoire de Paris-Meudon, 92195 Meudon, France
H. Flores
Affiliation:
GEPI, Observatoire de Paris-Meudon, 92195 Meudon, France
D. Elbaz
Affiliation:
CEA, Saclay-Service d'Astrophysique, Orme des Merisiers, F91191, Gif-sûr-Yvette, France
X. Z. Zheng
Affiliation:
Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
L. C. Deng
Affiliation:
National Astronomical Observatories, Chinese Academy of Sciences, 20A Datun Road, Chaoyang District, Beijing 100012, P.R. China, email: [email protected]
D. Marcillac
Affiliation:
CEA, Saclay-Service d'Astrophysique, Orme des Merisiers, F91191, Gif-sûr-Yvette, France
C. J. Cesarsky
Affiliation:
Max-Planck Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
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Abstract

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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 H$\beta$ 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 $\sim50$% of their metals and stellar masses since $z\sim1$.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 442 - 444
Copyright
© 2005 International Astronomical Union