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Simulations of Lyα Absorption from Low Surface Brightness Galaxies

Published online by Cambridge University Press:  12 April 2016

Suzanne M. Linder
Suzanne M. Linder*
Affiliation:
Pennsylvania State University, University Park, PA 16802, USA; slinder@astro.psu.edu

Abstract

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Using simulations of the low redshift galaxy population based upon galaxy observations, it is shown (Linder 1998) that the majority of Lyα absorbers at low redshift could arise in low surface brightness (LSB) galaxies. The contribution to absorption from LSB galaxies is large for any galaxy surface brightness distribution which is currently supported by observations. Lyα absorbers should become powerful tools for studying the properties and evolution of galaxies, but first it will be necessary to establish observationally the nature of the Lyα absorbers at low redshift. Further simulations, in which the absorbing galaxy population is ‘observed’ with some selection criteria, are used to explore how easy it is for an observer to test for a scenario in which LSB galaxies give rise to most of the Lyα absorbers. It is shown that absorption arising in LSB galaxies is often likely to be attributed to high surface brightness galaxies at larger impact parameters from the quasar line of sight.

Type
HI and QSO absorption lines
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 323 - 330
Copyright
Copyright © Astronomical Society of the Pacific 1999

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