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Galaxy morphology – halo gas connections

Published online by Cambridge University Press:  06 October 2005

Glenn G. Kacprzak ,
Christopher W. Churchill  and
Charles C. Steidel
Glenn G. Kacprzak
Affiliation:
Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA email: glennk@nmsu.edu,cwc@nmsu.edu
Christopher W. Churchill
Affiliation:
Department of Astronomy, New Mexico State University, Las Cruces, NM 88003, USA email: glennk@nmsu.edu,cwc@nmsu.edu
Charles C. Steidel
Affiliation:
Department of Astronomy, California Institute of Technology, Pasadena, CA 91125, USA email: ccs@astro.caltech.edu
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Abstract

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We studied a sample of 38 intermediate redshift MgII absorption-selected galaxies using (1) Keck/HIRES and VLT/UVES quasar spectra to measure the halo gas kinematics from MgII absorption profiles and (2) HST/WFPC–2 images to study the absorbing galaxy morphologies. We have searched for correlations between quantified gas absorption properties, and host galaxy impact parameters, inclinations, position angles, and quantified morphological parameters. We report a $3.2\sigma$ correlation between asymmetric perturbations in the host galaxy morphology and the MgII absorption equivalent width. We suggest that this correlation may indicate a connection between past merging and/or interaction events in MgII absorption-selected galaxies and the velocity dispersion and quantity of gas surrounding these galaxies.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C199: Probing Galaxies through Quasar Absorption Lines , March 2005 , pp. 80 - 85
Copyright
© 2005 International Astronomical Union