Evidence for a massive, extended circumgalactic medium around the Andromeda Galaxy
Journal Article
·
· Astrophysical Journal
- Department of Physics, University of Notre Dame, 225 Nieuwland Science Hall, Notre Dame, IN 46556 (United States)
- Department of Astronomy, University of Wisconsin, 475 N. Charter Street, Madison, WI 53706 (United States)
We demonstrate the presence of an extended and massive circumgalactic medium (CGM) around Messier 31 using archival HST Cosmic Origins Spectrograph ultraviolet spectroscopy of 18 QSOs projected within two virial radii of M31 (R{sub vir}=300 kpc). We detect absorption from Si iii at −300≲v{sub LSR}≲−150 km s{sup −1} toward all three sightlines at R≲0.2R{sub vir}, 3 of 4 sightlines at 0.8≲R/R{sub vir}≲1.1, and possibly 1 of 11 at 1.1
- OSTI ID:
- 22883237
- Journal Information:
- Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 2 Vol. 804; ISSN ASJOAB; ISSN 0004-637X
- Country of Publication:
- United Kingdom
- Language:
- English
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