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X-shaped Radio Galaxies: Optical Properties, Large-scale Environment, and Relationship to Radio Structure
Joshi, Ravi1; Krishna, Gopal2,3; Yang, Xiaolong1,4; Shi, Jingjing1; Yu, Si-Yue1,5; Wiita, Paul J.6; Ho, Luis C.1,5; Wu, Xue-Bing1,5; An, Tao4; Wang, Ran1,5; Subramanian, Smitha7; Yesuf, Hassen1
2019-12-20
Source PublicationASTROPHYSICAL JOURNAL
ISSN0004-637X
Volume887Issue:2Pages:13
Corresponding AuthorJoshi, Ravi(rvjoshirv@gmail.com)
AbstractIn 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.
DOI10.3847/1538-4357/ab536f
WOS KeywordACTIVE GALACTIC NUCLEI ; BINARY BLACK-HOLE ; LINE SPECTRA ; AGN ; MORPHOLOGY ; EMISSION ; CHANDRA ; LOUD ; POPULATION ; CANDIDATE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000506012000160
PublisherIOP PUBLISHING LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35591
Collection中国科学院紫金山天文台
Corresponding AuthorJoshi, Ravi
Affiliation1.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
2.Aryabhatta Res Inst Observat Sci ARIES, Naini Tal 263002, Uttarakhand, India
3.Univ Mumbai, UM DAE Ctr Excellence Basic Sci, Mumbai 400098, Maharashtra, India
4.Chinese Acad Sci, Key Lab Radio Astron, Shanghai Astron Observ, Shanghai 200030, Peoples R China
5.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
6.Coll New Jersey, Dept Phys, POB 7718, Ewing, NJ 08628 USA
7.Indian Inst Astrophys, Sarjapur Main Rd,Koramangala 2 Block, Bangalore 560034, Karnataka, India
Recommended Citation
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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