%0 Generic %1 burchett2017warmhot %A Burchett, Joseph N. %A Tripp, Todd M. %A Wang, Q. Daniel %A Willmer, Christopher N. A. %A Bowen, David V. %A Jenkins, Edward B. %D 2017 %K ICM X-ray absorption cold component hot %T Warm-hot Gas in X-ray Bright Galaxy Clusters and the H I-deficient Circumgalactic Medium in Dense Environments %U http://arxiv.org/abs/1705.05892 %X We analyze the intracluster medium (ICM) and circumgalactic medium (CGM) in 7 X-ray detected galaxy clusters using spectra of background QSOs from HST/COS and HST/STIS, optical spectroscopy of the cluster galaxies from MMT/Hectospec and SDSS, and X-ray imaging/spectroscopy from XMM-Newton and Chandra. Optical spectroscopy reveals many galaxies at small impact parameters (<300 kpc) to the QSO sightlines and within ~1000 km/s of the cluster redshifts; we report a very low covering fraction of H I absorption in the CGM of these cluster galaxies, f_c = 18% +14%/-9%, to stringent detection limits (log N(HI) < 13 cm^-2) in most cases. As field galaxies have H I covering fractions of ~100% at similar radii, the dearth of CGM H I in our data indicates that the cluster environment has effectively stripped or gravitationally heated and overionized the gaseous halos of these member galaxies. Second, we assess the contribution of warm-hot (10^5 - 10^6 K) gas to the ICM as traced by O VI and broad Ly-alpha (BLA) absorption, which would potentially bring the cluster baryon content closer to the universal baryon mass fraction (~17%). Despite the high S/N 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 material in the warm-hot phase along this line of sight totals to ~3% of that contained in the hot T > 10^7 K X-ray emitting phase. These features may trace pre-shocked material outside the cluster. Comparing halo gas properties in regions ranging 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, where galaxy clusters are extreme sites where the CGM is most severely transformed. This transformation may play a key role in environmental galaxy quenching.

@misc{burchett2017warmhot, abstract = {We analyze the intracluster medium (ICM) and circumgalactic medium (CGM) in 7 X-ray detected galaxy clusters using spectra of background QSOs from HST/COS and HST/STIS, optical spectroscopy of the cluster galaxies from MMT/Hectospec and SDSS, and X-ray imaging/spectroscopy from XMM-Newton and Chandra. Optical spectroscopy reveals many galaxies at small impact parameters (<300 kpc) to the QSO sightlines and within ~1000 km/s of the cluster redshifts; we report a very low covering fraction of H I absorption in the CGM of these cluster galaxies, f_c = 18% +14%/-9%, to stringent detection limits (log N(HI) < 13 cm^-2) in most cases. As field galaxies have H I covering fractions of ~100% at similar radii, the dearth of CGM H I in our data indicates that the cluster environment has effectively stripped or gravitationally heated and overionized the gaseous halos of these member galaxies. Second, we assess the contribution of warm-hot (10^5 - 10^6 K) gas to the ICM as traced by O VI and broad Ly-alpha (BLA) absorption, which would potentially bring the cluster baryon content closer to the universal baryon mass fraction (~17%). Despite the high S/N 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 material in the warm-hot phase along this line of sight totals to ~3% of that contained in the hot T > 10^7 K X-ray emitting phase. These features may trace pre-shocked material outside the cluster. Comparing halo gas properties in regions ranging 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, where galaxy clusters are extreme sites where the CGM is most severely transformed. This transformation may play a key role in environmental galaxy quenching.}, added-at = {2017-05-18T10:03:51.000+0200}, author = {Burchett, Joseph N. and Tripp, Todd M. and Wang, Q. Daniel and Willmer, Christopher N. A. and Bowen, David V. and Jenkins, Edward B.}, biburl = {https://www.bibsonomy.org/bibtex/2b3b667e30d1ced85a3566abfa7c6e3cf/miki}, description = {[1705.05892] Warm-hot Gas in X-ray Bright Galaxy Clusters and the H I-deficient Circumgalactic Medium in Dense Environments}, interhash = {974d5c1f96461ed791e6958694839a27}, intrahash = {b3b667e30d1ced85a3566abfa7c6e3cf}, keywords = {ICM X-ray absorption cold component hot}, note = {cite arxiv:1705.05892Comment: 19 pages, 12 figures, 5 tables. Submitted to MNRAS. Email corresponding author for galaxy survey data prior to publication}, timestamp = {2017-05-18T10:03:51.000+0200}, title = {Warm-hot Gas in X-ray Bright Galaxy Clusters and the H I-deficient Circumgalactic Medium in Dense Environments}, url = {http://arxiv.org/abs/1705.05892}, year = 2017 }