Gas and dust in the taffy galaxies: UGC 12914/15
文献类型：期刊论文
| 作者 | Zhu, Ming; Gao, Yu ; Seaquist, E. R.; Dunne, Loretta
|
| 刊名 | ASTRONOMICAL JOURNAL
 |
| 出版日期 | 2007-07-01 |
| 卷号 | 134期号:1页码:118-134 |
| ISSN号 | 0004-6256 |
| 关键词 | galaxies : individual (UGC 12914/15, VV 254) galaxies : interactions galaxies : ISM galaxies : stellar content radio lines : galaxies |
| 英文摘要 | We present a comprehensive study of the dust and gas properties in the after-head-on-collision UGC 12914/15 galaxy system using multitransition CO data and SCUBA submillimeter continuum images at both 450 and 850 mu m. CO(3-2) line emission was detected in the disks of UGC 12914 and UGC 12915, as well as in a bridge connecting the two galaxies. Dust emission at 450 mu m was detected for the first time in the two galactic disks and in the connecting bridge. Using a large velocity gradient excitation analysis model we have obtained good estimates of the physical parameters in different regions of this system, and the amount of molecular gas was found to be 3-4 times lower than that estimated by other investigators using the standard Galactic CO-to-H-2 conversion factor. Comparing with the dust mass derived from the SCUBA data, we found that the gas-to-dust ratio was comparable to the Galactic value in the two galaxy disks but a factor of similar to 3 higher in the bridge. The physical condition of the molecular gas in the bridge is comparable to that in the diffuse clouds in our Galaxy. Our result is consistent with the scenario that the bridge molecular gas originated from the disk molecular clouds and has been drawn out of the galactic disks due to direct cloud-cloud collision. Our data indicate that the global star formation efficiency (SFE; L-IR/M-H2) in UGC 12915 is comparable to that of normal spiral galaxies, and the SFE is 40% lower in UGC 12914 than in UGC 12915. Little star formation activity was found in the bridge except in an H II region adjacent to the disk of UGC 12915. |
| 学科主题 | Astronomy & Astrophysics |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | INFRARED-LUMINOUS GALAXIES ; GALACTIC GAMMA-RAYS ; STAR-FORMATION ; MOLECULAR CLOUDS ; INTERACTING GALAXIES ; SUBMILLIMETER LUMINOSITY ; VELOCITY DISPERSION ; RADIAL-DISTRIBUTION ; INTERSTELLAR-MEDIUM ; NEARBY GALAXIES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000247590500011 |
| 公开日期 | 2012-02-05 |
| 源URL | [http://159.226.72.40/handle/332002/2424]  |
| 专题 | 紫金山天文台_天体化学和行星科学实验室 |
| 作者单位 | 1.Natl Res Council Canada, Joint Astron Ctr, Hilo, HI 96720 USA 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Tianjin Normal Univ, Joint Inst Galaxies & AGN, Tianjin, Peoples R China 4.Purple Mt Observ, Tianjin, Peoples R China 5.Chinese Acad Sci, Natl Astron Observ, Beijing, Peoples R China 6.Univ Toronto, Dept Astron & Astrophys, Toronto, ON M5S 3H8, Canada 7.Royal Observ, Inst Astron, Edinburgh EH9 3HJ, Midlothian, Scotland |
| 推荐引用方式 GB/T 7714 | Zhu, Ming,Gao, Yu,Seaquist, E. R.,et al. Gas and dust in the taffy galaxies: UGC 12914/15[J]. ASTRONOMICAL JOURNAL,2007,134(1):118-134. |
| APA | Zhu, Ming,Gao, Yu,Seaquist, E. R.,&Dunne, Loretta.(2007).Gas and dust in the taffy galaxies: UGC 12914/15.ASTRONOMICAL JOURNAL,134(1),118-134. |
| MLA | Zhu, Ming,et al."Gas and dust in the taffy galaxies: UGC 12914/15".ASTRONOMICAL JOURNAL 134.1(2007):118-134. |
入库方式： OAI收割
来源：紫金山天文台
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