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Using weak Mg II lines to chart Low Surface Brightness Galaxies

Published online by Cambridge University Press:  12 April 2016

V. Le Brun  and
C.W. Churchill
V. Le Brun
Affiliation:
IGRAP/LAS du CNRS, BP 8, 13376 Marseille CEDEX 12
C.W. Churchill
Affiliation:
Penn. State University, University Park, PA 16802

Abstract

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We report the detection, based on HST and Keck data, of two peculiar absorbers in the Lyα forest of the quasar PKS 0454+039. These clouds, at redshifts z = 0.6248 and 0.9315 respectively, display both Mg II and Fe II absorption lines in addition to the Lyα line. Based upon photoionization models, these are inferred to be photoionized by the intergalactic UV background, and to have H I column densities in the range 15.8 ≤ N(H I) ≤ 16.8. Furthermore, if one supposes that the relative abundances of heavy elements is similar to that of depleted clouds of our galaxy, the abundances of these two absorbers are greater than the solar value, which is a unique case for absorbers which are not associated to the quasar. We tentatively suggest that these absorbers may select giant low surface brightness galaxies.

Type
HI and QSO absorption lines
Information
International Astronomical Union Colloquium , Volume 171: The Low Surface Brightness Universe , 1999 , pp. 315 - 322
Copyright
Copyright © Astronomical Society of the Pacific 1999

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