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Quasar Metal Abundances & Host Galaxy Evolution

Published online by Cambridge University Press:  09 March 2010

Fred Hamann  and
Leah E. Simon
Fred Hamann
Affiliation:
Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA email: [email protected]
Leah E. Simon
Affiliation:
Department of Astronomy, University of Florida, Gainesville, FL 32611-2055, USA email: [email protected]
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Abstract

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High-redshift quasars provide a unique glimpse into the early evolution of massive galaxies. The physical processes that trigger major bursts of star formation in quasar host galaxies (mergers and interactions) probably also funnel gas into the central regions to grow the super-massive black holes (SMBHs) and ignite the luminous quasar phenomenon. The globally dense environments where this occurs were probably also among the first to collapse and manufacture stars in significant numbers after the big bang. Measurements of the elemental abundances near quasars place important constraints on the nature, timing and extent of this star formation. A variety of studies using independent emission and absorption line diagnostics have shown that quasar environments have gas-phase metallicities that are typically a few times solar at all observed redshifts. These results are consistent with galaxy evolution scenarios in which large amounts of star formation (e.g., in the central regions) precede the visibly bright quasar phase. An observed trend for higher metallicities in more luminmous quasars (powered by more massive SMBHs) is probably tied to the well-known mass–metallicity relation among ordinary galaxies. This correlation and the absence of a trend with redshift indicate that mass is a more important parameter in the evolution than the time elapsed since the big bang.

Keywords

galaxies: formationgalaxies: high-redshiftquasars: generalquasars: absorption linesquasars: emission lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S265: Chemical Abundances in the Universe: Connecting First Stars to Planets , August 2009 , pp. 171 - 178
Copyright
Copyright © International Astronomical Union 2010

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