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Neutral Gas Phase Metallicities Associated with Dwarf Galaxies

Published online by Cambridge University Press:  30 October 2019

Sandhya M. Rao ,
David A. Turnshek  and
Eric M. Monier
Sandhya M. Rao
Affiliation:
Department of Physics and Astronomy and PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PITT PACC) University of Pittsburgh, Pittsburgh, PA 15216, USA emails: srao@pitt.edu, turnshek@pitt.edu
David A. Turnshek
Affiliation:
Department of Physics and Astronomy and PITTsburgh Particle physics, Astrophysics, and Cosmology Center (PITT PACC) University of Pittsburgh, Pittsburgh, PA 15216, USA emails: srao@pitt.edu, turnshek@pitt.edu
Eric M. Monier
Affiliation:
Department of Physics, College at Brockport, State University of New York, Brockport, NY 14420,USA email: emonier@brockport.edu
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Abstract

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Absorption line spectroscopy of foreground gas in the spectra of background quasars has revealed some clear cases where neutral gas is present and associated with dwarf galaxies. Spectroscopy of Lyα and low-ionization metal lines can be combined to derive neutral gas phase metallicities. The damped Lyα absorbers (DLAs) in quasar spectra are the clearest cases of absorption by predominantly neutral gas regions. Here we present some results on neutral gas phase metallicities for cases where the DLA is clearly associated with a dwarf galaxy. We find that the neutral gas phase metallicities in these systems are similar to those in other DLAs. We argue that there may be many unrecognized cases where a DLA is actually associated with a dwarf galaxy even though there is a luminous galaxy within 100 kpc of the quasar sightline.

Keywords

galaxies: dwarfgalaxies: abundancesquasars: absorption lines
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium S344: Dwarf Galaxies: From the Deep Universe to the Present , August 2018 , pp. 309 - 312
Copyright
© International Astronomical Union 2019 

References

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