Mon. Not. R. Astron. Soc., 475, 2067-2085 (2018/April-1)
Warm-hot gas in X-ray bright galaxy clusters and the H I-deficient circumgalactic medium in dense environments.
BURCHETT J.N., TRIPP T.M., WANG Q.D., WILLMER C.N.A., BOWEN D.V. and JENKINS E.B.
Abstract (from CDS):
We analyse the intracluster medium (ICM) and circumgalactic medium (CGM) in seven X-ray-detected galaxy clusters using spectra of background quasi-stellar objects (QSOs) (HST-COS/STIS), optical spectroscopy of the cluster galaxies (MMT/Hectospec and SDSS), and X-ray imaging/spectroscopy (XMM-Newton and Chandra). First, we report a very low covering fraction of H I absorption in the CGM of these cluster galaxies, fc=25+25^–15 percent, to stringent detection limits (N(H I) <1013 cm–2). As field galaxies have an H I covering fraction of ∼ 100 per cent at similar radii, the dearth of CGM H I in our data indicates that the cluster environment has effectively stripped or overionized the gaseous haloes of these cluster galaxies. Secondly, we assess the contribution of warm-hot (105-106 K) gas to the ICM as traced by O VI and broad Ly α (BLA) absorption. Despite the high signal-to-noise ratio of our data, we do not detect O VI in any cluster, and we only detect BLA features in the QSO spectrum probing one cluster. We estimate that the total column density of warm-hot gas along this line of sight totals to ∼ 3 per cent of that contained in the hot T > 107 K X-ray emitting phase. Residing at high relative velocities, these features may trace pre-shocked material outside the cluster. Comparing gaseous galaxy haloes from the low-density 'field' to galaxy groups and high-density clusters, we find that the CGM is progressively depleted of H I with increasing environmental density, and the CGM is most severely transformed in galaxy clusters. This CGM transformation may play a key role in environmental galaxy quenching.
© 2017 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
galaxies: clusters: intracluster medium - galaxies: evolution - galaxies: groups: general - galaxies: haloes - quasars: absorption lines - X-rays: galaxies: clusters
Status in Simbad:
waiting for electronic table
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