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Age Problem Based on the Abundance Ratio from a High-Redshift QSO

Published online by Cambridge University Press:  19 July 2016

T. Tsujimoto ,
Y. Yoshii  and
K. Kawara
T. Tsujimoto
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan
Y. Yoshii
Affiliation:
Institute of Astronomy, Faculty of Science, University of Tokyo, Mitaka, Tokyo 181-8588, Japan
K. Kawara
Affiliation:
Institute of Astronomy, Faculty of Science, University of Tokyo, Mitaka, Tokyo 181-8588, Japan

Abstract

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The age of a high-redshift QSO can constrain the cosmology by placing a limit on the cosmological time. We use the observed FeII (UV+optical)/MgIIλ2798 flux ratio from the broad-line gas of a QSO at z=3.62 to estimate the abundance ratio [Mg/Fe] and predict that the QSO is at least 1.3 Gyr old from the chemical analysis using the abundance ratio [Mg/Fe] as a cosmic clock. Our result favors a nonzero cosmological constant and thus conflicts with a flat, matter-dominated universe.

Type
Conference Papers in order of Presentation
Information
Symposium - International Astronomical Union , Volume 187: Cosmic Chemical Evolution , 2002 , pp. 153 - 157
Copyright
Copyright © 2002 

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