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VLBI Observations of a sample of Palomar-Green quasars II: characterizing the parsec-scale radio emission

文献类型：期刊论文

作者Wang, Ailing1,9; An, Tao1,2,9; Zhang, Yingkang1,2; Cheng, Xiaopeng3; Ho, Luis C.4,5; Kellermann, Kenneth, I6; Baan, Willem A.7,8
刊名MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
出版日期2023-09-11
卷号525期号:4页码:6064-6083
关键词instrumentation: high angular resolution methods: observational galaxies: jets galaxies: nuclei
ISSN号0035-8711
DOI10.1093/mnras/stad2651
产权排序8
英文摘要This study uses multifrequency very long baseline interferometry (VLBI) to study the radio emission from 10 radio-quiet quasars (RQQs) and four radio-loud quasars (RLQs). The diverse morphologies, radio spectra, and brightness temperatures observed in the VLBI images of these RQQs, together with the variability in their GHz spectra and VLBI flux densities, shed light on the origins of their nuclear radio emission. The total radio emission of RQQs appears to originate from non-thermal synchrotron radiation due to a combination of active galactic nuclei and star formation activities. However, our data suggest that the VLBI-detected radio emission from these RQQs is primarily associated with compact jets or corona, with extended emissions such as star formation and large-scale jets being resolved by the high resolution of the VLBI images. Wind emission models are not in complete agreement the VLBI observations. Unlike RLQs, where the parsec-scale radio emission is dominated by a relativistically boosted core, the radio cores of RQQs are either not dominant or are mixed with significant jet emission. RQQs with compact cores or core-jet structures typically have more pronounced variability, with flat or inverted spectra, whereas jet-dominated RQQs have steep spectra and unremarkable variability. Future high-resolution observations of more RQQs could help to determine the fraction of different emission sources and their associated physical mechanisms.
WOS关键词SEYFERT 1 GALAXY ; QUIET QUASARS ; XMM-NEWTON ; CENTRAL ENGINES ; LINE REGION ; LOW-STATE ; JET ; LOUD ; WIND ; I.
资助项目National SKA Programme of China[2022SKA0120102] ; Tianchi Talents Programme of Xinjiang Uygur Autonomous Region ; Brain Pool Programme through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT[2019H1D3A1A01102564] ; National Science Foundation of China[11721303] ; National Science Foundation of China[11991052] ; National Science Foundation of China[12011540375] ; China Manned Space Project[CMS-CSST-2021-A04] ; China Manned Space Project[CMS-CSST-2021-A06] ; National Natural Science Foundation of China[11433008] ; Chinese Academy of Sciences President's International Fellowship Initiative[2021VMA0008] ; Chinese Academy of Sciences President's International Fellowship Initiative[2022VMA0019] ; Shanghai Astronomical Observatory through an MoU ; NRAO ; Ministry of Science and Technology of China ; Chinese Academy of Sciences
WOS研究方向Astronomy & Astrophysics
语种英语
WOS记录号WOS:001072112100009
出版者OXFORD UNIV PRESS
资助机构National SKA Programme of China ; Tianchi Talents Programme of Xinjiang Uygur Autonomous Region ; Brain Pool Programme through the National Research Foundation of Korea (NRF) - Ministry of Science and ICT ; National Science Foundation of China ; China Manned Space Project ; National Natural Science Foundation of China ; Chinese Academy of Sciences President's International Fellowship Initiative ; Shanghai Astronomical Observatory through an MoU ; NRAO ; Ministry of Science and Technology of China ; Chinese Academy of Sciences
源URL[http://ir.xao.ac.cn/handle/45760611-7/5526]  
专题恒星形成与演化研究团组
通讯作者An, Tao
作者单位1.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China
2.Chinese Acad Sci, Key Lab Radio Astron & Technol, A20 Datun Rd, Beijing 100101, Peoples R China
3.Korea Astron & Space Sci Inst, 776 Daedeok Daero, Daejeon 34055, South Korea
4.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
5.Peking Univ, Sch Phys, Dept Astron, Beijing 100871, Peoples R China
6.Natl Radio Astron Observ, 520 Edgemont Rd, Charlottesville, VA 22903 USA
7.Chinese Acad Sci, Xinjiang Astron Observ, 150 Sci 1 St, Urumqi 830011, Peoples R China
8.Netherlands Inst Radio Astron ASTRON, NL-7991 PD Dwingeloo, Netherlands
9.Univ Chinese Acad Sci, Sch Astron & Space Sci, 19 A Yuquan Rd, Beijing 100049, Peoples R China
推荐引用方式
GB/T 7714		 Wang, Ailing,An, Tao,Zhang, Yingkang,et al. VLBI Observations of a sample of Palomar-Green quasars II: characterizing the parsec-scale radio emission[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2023,525(4):6064-6083.
APA Wang, Ailing.,An, Tao.,Zhang, Yingkang.,Cheng, Xiaopeng.,Ho, Luis C..,...&Baan, Willem A..(2023).VLBI Observations of a sample of Palomar-Green quasars II: characterizing the parsec-scale radio emission.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,525(4),6064-6083.
MLA Wang, Ailing,et al."VLBI Observations of a sample of Palomar-Green quasars II: characterizing the parsec-scale radio emission".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 525.4(2023):6064-6083.

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