Detection of a Multiphase Intragroup Medium: Results from the COS-IGrM Survey

Abstract

We present the results of the COS Intragroup Medium (COS-IGrM) Survey that used the Cosmic Origins Spectrograph on the Hubble Space Telescope to observe a sample of 18 UV bright quasars, each probing the intragroup medium (IGrM) of a galaxy group. We detect Ly$\alpha$, 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 8 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 $10^{5.8}$ and $10^6$ 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.

29 pages, 26 figures, accepted to ApJ

References in corpus (27)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• The Circumgalactic Medium
• Galaxy Groups in the SDSS DR4: I. The Catalogue and Basic Properties
• The COS-Halos Survey: Physical Conditions and Baryonic Mass in the Low-Redshift Circumgalactic Medium
• Time-Dependent Ionization in Radiatively Cooling Gas
• A High-Resolution Survey of Low-Redshift QSO Absorption Lines: Statistics and Physical Conditions of O VI Absorbers
• The COS-Dwarfs Survey: The Carbon Reservoir Around sub-L* Galaxies
• The COS-Halos Survey: Origins of the Highly Ionized Circumgalactic Medium of Star-Forming Galaxies
• X-Ray Absorption from the Milky Way Halo and the Local Group
• The Far Ultraviolet Spectroscopic Explorer Survey of OVI Absorption in the Disk of the Milky Way
• The Nature and Origin of Low-Redshift O VI Absorbers
• The Properties of Low Redshift Intergalactic O VI Absorbers Determined from High S/N Observations of 14 QSOs with the Cosmic Origins Spectrograph
• Evidence for a Massive, Extended Circumgalactic Medium Around the Andromeda Galaxy
• The Properties of the Circumgalactic Medium in Red and Blue Galaxies: Results from the COS-GASS+COS-Halos Surveys
• Multi-phase Circum-Galactic Medium probed with MUSE and ALMA
• A Measurement of the Galaxy Group-Thermal Sunyaev-Zel'dovich Effect Cross-Correlation Function
• A Giant Intragroup Nebula Hosting a Damped Lya Absorber at z=0.313
• The Impact of the Group Environment on the OVI Circumgalactic Medium
• Galaxy Interactions in Compact Groups II: abundance and kinematic anomalies in HCG 91c
• Hot WHIM counterparts of FUV OVI absorbers: Evidence in the line-of-sight towards quasar 3C 273
• The Warm Circum-Galactic Medium: 10^5-6 K Gas Associated with a Single Galaxy Halo or with an Entire Group of Galaxies?
• NUV signatures of environment driven galaxy quenching in SDSS groups
• Evidence for galaxy quenching in the green valley caused by a lack of a circumgalactic medium
• Detection of Low Metallicity Warm Plasma in a Galaxy Overdensity Environment at z ~ 0.2
• SZ Scaling Relations of Galaxy Groups and Clusters Near the North Ecliptic Pole
• DIISC-I: The Discovery of Kinematically Anomalous HI Clouds in M 100
• A Sub-Damped Ly$\alpha$ Absorber with Unusual Abundances: Evidence of Gas Recycling in a Low-Redshift Galaxy Group

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