期刊
ASTRONOMY & ASTROPHYSICS
卷 507, 期 2, 页码 723-746出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200911878
关键词
galaxies: evolution; galaxies: interactions; galaxies: intergalactic medium; galaxies: kinematics and dynamics
资金
- FAPESP [2007/07973-3]
- Brazilian agencies FAPESP [2006/56213-9]
- CNPq
- CAPES
- GALEX [NNG06GG45G]
- CAPES [3656/08-0]
- NASA
- Jet Propulsion Laboratory
- California Institute of Technology
- National Aeronautics and Space Administration
Context. Compact groups of galaxies are entities that have high densities of galaxies and serve as laboratories to study galaxy interactions, intergalactic star formation and galaxy evolution. Aims. The main goal of this study is to search for young objects in the intragroup medium of seven compact groups of galaxies: HCG 2, 7, 22, 23, 92, 100 and NGC 92 as well as to evaluate the stage of interaction of each group. Methods. We used Fabry-Perot velocity fields and rotation curves together with GALEX NUV and FUV images and optical R-band and HI maps. Results. (i) HCG 7 and HCG 23 are in early stages of interaction; (ii) HCG 2 and HCG 22 are mildly interacting; and (iii) HCG 92, HCG 100 and NGC 92 are in late stages of evolution. We find that all three evolved groups contain populations of young blue objects in the intragroup medium, consistent with ages < 100 Myr, of which several are younger than < 10 Myr. We also report the discovery of a tidal dwarf galaxy candidate in the tail of NGC 92. These three groups, besides containing galaxies that have peculiar velocity fields, also show extended HI tails. Conclusions. Our results indicate that the advanced stage of evolution of a group, together with the presence of intragroup HI clouds, may lead to star formation in the intragroup medium. A table containing all intergalactic HII regions and tidal dwarf galaxies confirmed to date is appended.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据