X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure
文献类型：期刊论文
| 作者 | Joshi, Ravi7; Krishna, Gopal5,6; Yang, Xiaolong4,7; Shi, Jingjing7; Yu, Si-Yue3,7; Wiita, Paul J.2; Ho, Luis C.3,7; Wu, Xue-Bing3,7; An, Tao4; Wang, Ran3,7 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2019-12-20 |
| 卷号 | 887期号:2页码:13 |
| ISSN号 | 0004-637X |
| DOI | 10.3847/1538-4357/ab536f |
| 通讯作者 | Joshi, Ravi(rvjoshirv@gmail.com) |
| 英文摘要 | In pursuit of clues to the origin of "winged" or X-shaped radio galaxies (XRGs) we investigate the parent galaxies of a large sample of 106 XRGs for optical-radio axes alignment, interstellar medium, black hole mass, and largescale environment. For 41 of the XRGs it was possible to determine the optical major axis and the primary radio axis and the strong tendency for the two axes to be fairly close is confirmed. However, several counter-examples were also found and these could challenge the widely discussed backflow diversion model for the origin of the radio wings. Comparison with a well-defined large sample of normal FR II radio galaxies has revealed that: (i) XRGs possess slightly less massive central black holes than the normal radio galaxies (average masses being logMBH similar to 8.81M(circle dot) and 9.07M(circle dot), respectively); (ii) a much higher fraction of XRGs (similar to 80%) exhibits red mid-IR colors (W2-W3 > 1.5), indicating a population of young stars and/or an enhanced dust mass, probably due to relatively recent galaxy merger(s). A comparison of the large-scale environment (i.e., within similar to 1 Mpc) shows that both XRGs and FRII radio galaxies inhabit similarly poor galaxy clustering environments (medium richness being 8.94 and 11.87, respectively). Overall, the origin of XRGs seems difficult to reconcile with a single dominant physical mechanism and competing mechanisms seem prevalent. |
| WOS关键词 | ACTIVE GALACTIC NUCLEI ; BINARY BLACK-HOLE ; LINE SPECTRA ; AGN ; MORPHOLOGY ; EMISSION ; CHANDRA ; LOUD ; POPULATION ; CANDIDATE |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| 出版者 | IOP PUBLISHING LTD |
| WOS记录号 | WOS:000506012000160 |
| 源URL | [http://libir.pmo.ac.cn/handle/332002/35590]  |
| 专题 | 中国科学院紫金山天文台 |
| 通讯作者 | Joshi, Ravi |
| 作者单位 | 1.Indian Inst Astrophys, Sarjapur Main Rd,Koramangala 2 Block, Bangalore 560034, Karnataka, India 2.Coll New Jersey, Dept Phys, POB 7718, Ewing, NJ 08628 USA 3.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China 4.Chinese Acad Sci, Key Lab Radio Astron, Shanghai Astron Observ, Shanghai 200030, Peoples R China 5.Univ Mumbai, UM DAE Ctr Excellence Basic Sci, Mumbai 400098, Maharashtra, India 6.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, Uttarakhand, India 7.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China |
| 推荐引用方式 GB/T 7714 | Joshi, Ravi,Krishna, Gopal,Yang, Xiaolong,et al. X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure[J]. ASTROPHYSICAL JOURNAL,2019,887(2):13. |
| APA | Joshi, Ravi.,Krishna, Gopal.,Yang, Xiaolong.,Shi, Jingjing.,Yu, Si-Yue.,...&Yesuf, Hassen.(2019).X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure.ASTROPHYSICAL JOURNAL,887(2),13. |
| MLA | Joshi, Ravi,et al."X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure".ASTROPHYSICAL JOURNAL 887.2(2019):13. |
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来源：紫金山天文台
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