SDSS IV MaNGA: Discovery of an Ha Blob Associated with a Dry Galaxy Pair-Ejected Gas or a "Dark" Galaxy Candidate?
文献类型：期刊论文
| 作者 | Lin, Lihwai2; Lin, Jing-Hua2,3; Hsu, Chin-Hao2,3; Fu, Hai4; Huang, Song5; Sanchez, Sebastian F.6; Gwyn, Stephen7; Gelfand, Joseph D.8,9; Cheung, Edmond5; Masters, Karen10 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2017-03-01 |
| 卷号 | 837期号:1 |
| 关键词 | Galaxies: Evolution Galaxies: Interactions Galaxies: Peculiar |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/837/1/32 |
| 英文摘要 | We report the discovery of a mysterious giant Ha. blob that is similar to 8 kpc away from the main MaNGA target 1-24145, one component of a dry galaxy merger, and has been identified in the first-year SDSS-IV MaNGA data. The size of the Ha. blob is similar to 3-4 kpc in radius, and the Ha. distribution is centrally concentrated. However, there is no optical continuum counterpart in the deep broadband images reaching similar to 26.9 mag arcsec(-2) in surface brightness. We estimate that the masses of the ionized and cold gases are 3.3 x 10(5) M-circle dot and < 1.3 x 10(9) M-circle dot respectively. The emission-line ratios indicate that the Ha. blob is photoionized by a combination of massive young stars and AGNs. Furthermore, the ionization line ratio decreases from MaNGA 1-24145 to the H alpha blob, suggesting that the primary ionizing source may come from MaNGA 1-24145, likely a low-activity AGN. Possible explanations for this Ha. blob include the AGN outflow, the gas remnant being tidally or ram-pressure stripped from MaNGA 1-24145, or an extremely low surface brightness galaxy. However, the stripping scenario is less favored according to galaxy merger simulations and the morphology of the H alpha blob. With the current data, we cannot distinguish whether this Ha. blob is ejected gas due to a past AGN outburst, or a special category of "ultra-diffuse galaxy" interacting with MaNGA 1-24145 that further induces the gas inflow to fuel the AGN in MaNGA 1-24145. |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000401170800017 |
| 出版者 | IOP PUBLISHING LTD |
| 源URL | [http://119.78.226.72/handle/331011/32621]  |
| 专题 | 中国科学院上海天文台 |
| 通讯作者 | Lin, Lihwai |
| 作者单位 | 1.Univ Cambridge, Kavli Inst Cosmol, Cambridge CB3 0HE, England 2.Acad Sinica, Inst Astron & Astrophys, Taipei 10617, Taiwan 3.Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan 4.Univ Iowa, Dept Phys & Astron, Iowa City, IA 52242 USA 5.Univ Tokyo, Inst Adv Study, Kavli Inst Phys & Math Universe WPI, Kashiwa, Chiba 2778583, Japan 6.Univ Nacl Autonoma Mexico, Inst Astron, AP 70-264, Mexico City 04510, DF, Mexico 7.Natl Res Council Canada, NRC Herzberg Astron & Astrophys, 5071 West Saanich Rd, Victoria, BC V9E 2E7, Canada 8.NYU Abu Dhabi, POB 129188, Abu Dhabi, U Arab Emirates 9.NYU, Ctr Cosmol & Particle Phys, New York, NY 10003 USA 10.Univ Portsmouth, Inst Cosmol & Gravitat, Dennis Sciama Bldg, Portsmouth PO1 3FX, Hants, England |
| 推荐引用方式 GB/T 7714 | Lin, Lihwai,Lin, Jing-Hua,Hsu, Chin-Hao,et al. SDSS IV MaNGA: Discovery of an Ha Blob Associated with a Dry Galaxy Pair-Ejected Gas or a "Dark" Galaxy Candidate?[J]. ASTROPHYSICAL JOURNAL,2017,837(1). |
| APA | Lin, Lihwai.,Lin, Jing-Hua.,Hsu, Chin-Hao.,Fu, Hai.,Huang, Song.,...&Thomas, Daniel.(2017).SDSS IV MaNGA: Discovery of an Ha Blob Associated with a Dry Galaxy Pair-Ejected Gas or a "Dark" Galaxy Candidate?.ASTROPHYSICAL JOURNAL,837(1). |
| MLA | Lin, Lihwai,et al."SDSS IV MaNGA: Discovery of an Ha Blob Associated with a Dry Galaxy Pair-Ejected Gas or a "Dark" Galaxy Candidate?".ASTROPHYSICAL JOURNAL 837.1(2017). |
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来源：上海天文台
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