An H I view of galaxy conformity: H I-rich environment around H I-excess galaxies

作者：Wang, Jing^*; Serra, Paolo; Jozsa, Gyula I. G.; Koribalski, Baerbel; van der Hulst, Thijs; Kamphuis, Peter; Li, Cheng; Fu, Jian; Xiao, Ting; Overzier, Roderik; Wieringa, Mark; Wang, Enci

来源：Monthly Notices of the Royal Astronomical Society, 2015, 453(3): 2399-2411.

DOI：10.1093/mnras/stv1767

• intergalactic medium
• galaxies: spiral

Using data taken as part of the Bluedisk project, we study the connection between neutral hydrogen (H I) in the environment of spiral galaxies and that in the galaxies themselves. We measure the total HI mass present in the environment in a statistical way by studying the distribution of noise peaks in the HI data cubes obtained for 40 galaxies observed with Westerbork Synthesis Radio Telescope. We find that galaxies whose HI mass fraction is high relative to standard scaling relations have an excess HI mass in the surrounding environment as well. Gas in the environment consists of gas clumps which are individually below the detection limit of our HI data. These clumps may be hosted by small satellite galaxies and/or be the high-density peaks of a more diffuse gas distribution in the intergalactic medium. We interpret this result as an indication for a picture in which the HI-rich central galaxies accrete gas from an extended gas reservoir present in their environment.

• 出版日期2015-11-1
• 单位中国科学院上海天文台; CSIRO