HST observations reveal the curious geometry of circumgalactic gas

Glenn G. Kacprzak, Sowgat Muzahid, Christopher W. Churchill, Nikole M. Nielsen, Jane C. Charlton

Research output: Contribution to journalArticlepeer-review


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.

Original languageEnglish (US)
Pages (from-to)342-344
Number of pages3
JournalProceedings of the International Astronomical Union
Issue numberS321
StatePublished - Mar 1 2016

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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