Warm Gas in the Virgo Cluster: I. Distribution of Lya AbsorbersReportar como inadecuado



 Warm Gas in the Virgo Cluster: I. Distribution of Lya Absorbers


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The first systematic study of the warm gas T=10^4-5 K distribution across a galaxy cluster is presented using multiple background QSOs to the Virgo Cluster. We detect 25 Lya absorbers N HI = 10^13.1-15.4 cm^-2 in the Virgo velocity range toward 9 of 12 QSO sightlines observed with Cosmic Origin Spectrograph, with a cluster impact parameter range of 0.36-1.65 Mpc 0.23-1.05R vir. Including 18 Lya absorbers previously detected by STIS or GHRS toward 7 of 11 background QSOs in and around the Virgo Cluster, we establish a sample of 43 absorbers towards a total of 23 background probes for studying the incidence of Lya absorbers in and around the Virgo Cluster. With these absorbers, we find: 1 warm gas is predominantly in the outskirts of the cluster and avoids the X-ray detected hot ICM. Also, Lya absorption strength increases with cluster impact parameter. 2 Lya absorbing warm gas traces cold HI emitting gas in the substructures of the Virgo Cluster. 3 Including the absorbers associated with the surrounding substructures, the warm gas covering fraction 100% for N HI 10^13.1 cm^-2 is in agreement with cosmological simulations. We speculate that the observed warm gas is part of large-scale gas flows feeding the cluster both the ICM and galaxies.



Autor: Joo Heon Yoon; Mary Putman; Christopher Thom; Hsiao-Wen Chen; Greg Bryan

Fuente: https://archive.org/







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