期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 423, 期 2, 页码 1831-1844出版社
WILEY-BLACKWELL
DOI: 10.1111/j.1365-2966.2012.21005.x
关键词
ISM: bubbles; H ii regions; galaxies: dwarf; galaxies: ISM; galaxies: kinematics and dynamics
资金
- Ministry of Education and Science of Russian Federation [16.518.11.7073, 16.552.11.7028]
- National Aeronautics and Space Administration
- Federal Target Programme Scientific and Scientific-Pedagogical Cadre of Innovative Russia [14.740.11.0800]
- Russian Foundation for Basic Research [10-02-00091]
- 'Dynasty' Foundation
- Alfred P. Sloan Foundation
- National Science Foundation
- U.S. Department of Energy
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- University of Chicago
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Los Alamos National Laboratory
- Max-Planck-Institute for Astronomy (MPIA)
- Max-Planck-Institute for Astrophysics (MPA)
- New Mexico State University
- University of Pittsburgh
- Princeton University
- United States Naval Observatory
- University of Washington
We present the results of an ionized gas turbulent motions study in several nearby dwarf galaxies using a scanning FabryPerot interferometer with the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS). Combining the intensityvelocity dispersion diagrams () with two-dimensional maps of radial velocity dispersion, we found a number of common patterns pointing to the relation between the value of chaotic ionized gas motions and processes of current star formation. In five out of the seven analysed galaxies, we identified expanding shells of ionized gas with diameters of 80-350 pc and kinematic ages of 14 Myr. We also demonstrate that the diagrams may be useful for the search of supernova remnants, other small expanding shells or unique stars in nearby galaxies. As an example, a candidate luminous blue variable (LBV) was found in UGC 8508. We propose some additions to the interpretation, previously used by Munoz-Tunon et al. to explain the diagrams for giant star formation regions. In the case of dwarf galaxies, a major part of the regions with high velocity dispersion belongs to the diffuse low surface brightness emission, surrounding the star-forming regions. We attribute this to the presence of perturbed low-density gas with high values of turbulent velocities around the giant H ii regions.
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