Abstract
We present the results of the Cosmic Origins Spectrograph-Intragroup Medium (COS-IGrM) Survey that used the COS on the Hubble Space Telescope to observe a sample of 18 UV bright quasars, each probing the IGrM of a galaxy group. We detect Lyα, C ii, N v, Si ii, Si iii, and O vi in multiple sightlines. The highest ionization species detected in our data is O vi, which was detected in eight out of 18 quasar sightlines. The wide range of ionization states observed provide evidence that the IGrM is patchy and multiphase. We find that the O vi detections generally align with radiatively cooling gas between 105.8 and 106 K. The lack of O vi detections in 10 of the 18 groups illustrates that O vi may not be the ideal tracer of the volume filling component of the IGrM. Instead, it either exists at trace levels in a hot IGrM or is generated in the boundary between the hotter IGrM and cooler gas.
Original language | English (US) |
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Article number | 189 |
Journal | Astrophysical Journal |
Volume | 923 |
Issue number | 2 |
DOIs | |
State | Published - Dec 20 2021 |
ASJC Scopus subject areas
- Astronomy and Astrophysics
- Space and Planetary Science
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18 UV bright QSOs obs. with HST (COS-IGrM survey)
McCabe, T. (Creator), Borthakur, S. (Creator), Heckman, T. (Creator), Tumlinson, J. (Creator), Bordoloi, R. (Creator) & Dave, R. (Creator), Centre de Donnees Strasbourg (CDS), 2023
DOI: 10.26093/cds/vizier.19230189, https://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/923/189
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