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Constraining MgII absorber systems with the SDSS

Published online by Cambridge University Press:  06 October 2005

Brice Ménard ,
Stefano Zibetti ,
Daniel Nestor  and
David Turnshek
Brice Ménard
Affiliation:
Institute for Advanced Study, Einstein Drive, Princeton NJ 08540, USA
Stefano Zibetti
Affiliation:
Max-Planck-Institut für Extraterrestrische Physik, Garching, Germany
Daniel Nestor
Affiliation:
Dept. of Astronomy, University of Florida, Gainesville, FL 32611, USA
David Turnshek
Affiliation:
Dept. of Physics and Astronomy, University of Pittsburgh, Pittsburgh, PA 15260, USA
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Abstract

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Using a large sample of MgII absorbers with $0.4<z<2.2$ detected by Nestor et al. (2005) in the Early Data Release of the SDSS, we present new constraints on the physical properties of these systems based on two statistical analyses: (i) by computing the ratio between the composite spectra of quasars with and without absorbers, we measure the reddening effects induced by these intervening systems; and (ii) by stacking SDSS images centred on quasars with strong MgII absorption lines and isolating the excess light around the PSF, we measure the mean luminosity and colours of the absorbing galaxies. This statistical approach does not require any spectroscopic follow up and allows us to constrain the photometric properties of absorber systems.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 86 - 91
Copyright
© 2005 International Astronomical Union