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HST Observations Reveal the Curious Geometry of Circumgalactic Gas

Published online by Cambridge University Press:  21 March 2017

Glenn G. Kacprzak ,
Sowgat Muzahid ,
Christopher W. Churchill ,
Nikole M. Nielsen  and
Jane C. Charlton
Glenn G. Kacprzak
Affiliation:
Swinburne University of Technology, Victoria 3122, Australia, email: gkacprzak@astro.swin.edu.au
Sowgat Muzahid
Affiliation:
The Pennsylvania State University, State College, PA 16801, USA
Christopher W. Churchill
Affiliation:
New Mexico State University, Las Cruces, NM 88003, USA
Nikole M. Nielsen
Affiliation:
Swinburne University of Technology, Victoria 3122, Australia, email: gkacprzak@astro.swin.edu.au
Jane C. Charlton
Affiliation:
The Pennsylvania State University, State College, PA 16801, USA
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Abstract

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We have discovered that warm gas flows along galaxy major and minor axes detected out to 200 kpc. Our results are derived from a sample of HST-imaged isolated galaxies with nearby background quasars used to probe their 105K CGM detected in HST/COS UV spectra (traced by Ovi absorption). We constrain the geometry of the gas to reside between 20-40 degrees of the projected major axis and within 60 degrees of the projected minor axis, with little-to-no gas found in between. Furthermore, strong absorption systems tend to be found along the minor axes of star-forming galaxies. All of our results are consistent with the current view of the CGM originating from major axis-fed inflows/recycled gas and from minor axis-driven outflows.

Keywords

quasars: absorption linesgalaxies: halosgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 342 - 344
Copyright
Copyright © International Astronomical Union 2017 

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