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Searching for Mg II absorbers in and around galaxy clusters
작성일
2021.05.10
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Searching for Mg II absorbers in and around galaxy clusters


Jong Chul Lee, Ho Seong Hwang, Hyunmi Song


Monthly Notices of the Royal Astronomical Society, Volume 503, Issue 3, May 2021, Pages 4309–4319


To study environmental effects on the circumgalactic medium (CGM), we use the samples of redMaPPer galaxy clusters, background quasars and cluster galaxies from the SDSS. With ~82 000 quasar spectra, we detect 197 MgII absorbers in and around the clusters. The detection rate per quasar is 2.7±0.7 times higher inside the clusters than outside the clusters, indicating that MgII absorbers are relatively abundant in clusters. However, when considering the galaxy number density, the absorber-to-galaxy ratio is rather low inside the clusters. If we assume that MgII absorbers are mainly contributed by the CGM of massive star-forming galaxies, a typical halo size of cluster galaxies is smaller than that of field galaxies by 30±10 per cent. This finding supports that galaxy haloes can be truncated by interaction with the host cluster.


https://arxiv.org/abs/2103.02856

저자명
Hyunmi Song