ALFALFA and WSRT imaging of extended H I features in the Leo Cloud of galaxies

作者：Leisman Lukas; Haynes Martha P; Giovanelli Riccardo; Jozsa Gyula; Adams Elizabeth A K; Hess Kelley M

来源：Monthly Notices of the Royal Astronomical Society, 2016, 463(2): 1692-1706.

DOI：10.1093/mnras/stw2083

• galaxies: evolution
• galaxies: groups: individual: NGC 3190
• galaxies: groups: individual: NGC 3227
• galaxies: groups: individual: HCG 44
• radio lines: galaxies

We present Arecibo Legacy Fast ALFA (ALFALFA) H I observations of a well-studied region of the Leo Cloud, which includes the NGC 3227 group and the NGC 3190 group. We detect optically dark H I tails and plumes with extents potentially exceeding 600 kpc, well beyond the field of view of previous observations. These H I features contain similar to 40 per cent of the total H I mass in the NGC 3227 group and similar to 10 per cent of the NGC 3190 group. We also present Westerbork Synthesis Radio Telescope (WSRT) maps which show the complex morphology of the extended emission in the NGC 3227 group. We comment on previously proposed models of the interactions in these groups and the implications for the scale of group processing through interactions. Motivated by the extent of the H I plumes, we place the H I observations in the context of the larger loose group, demonstrating the need for future sensitive, wide field H I surveys to understand the role of group processing in galaxy evolution.

• 出版日期2016-12-1