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Radio Activity of Supermassive Black Holes with Extremely High Accretion Rates
Yang,Xiaolong1,2; Yao,Su1,3; Yang,Jun2,4; Ho,Luis C.1,5; An,Tao2; Wang,Ran1,5; Baan,Willem A.6,7; Gu,Minfeng8; Liu,Xiang6; Yang,Xiaofeng6; Joshi,Ravi1
2020-12-01
Source PublicationThe Astrophysical Journal
ISSN0004-637X
Volume904Issue:2
AbstractAbstract Radio emission from the high- and super-Eddington accreting active galactic nuclei (AGNs) has various origins: a persistent jet, the magnetized corona, and the wind-like outflows. It is still unclear which is the leading mechanism responsible for the observed radio emission and how the radio emission is related to other characteristic parameters such as the Eddington ratio and black hole mass. In this paper, we present the 5 GHz Very Large Array (VLA) observational results of a sample of 25 extremely high Eddington accreting supermassive black holes (EESBHs, the Eddington ratio λEdd close to or above 1) in narrow-line Seyfert 1 galaxies, among which 22 sources are detected. Most of the EESBHs show a compact radio structure from a few hundred parsecs to 1 kpc scale. We estimated the lowest star formation rate surface density required for producing the observed radio emission and found that it is higher than the largest value previously detected in circumnuclear starburst galaxies, implying that the radio emission is from the AGN activity. Along with a comparison sample, we find an overall inverse –λEdd correlation ranging from sub- to super-Eddington ratios. The high-Eddington and mildly super-Eddington AGNs (?0.5 < log ) have a radio-to-X-ray luminosity ratio LR/LX?~?10?5–10?4 and a steep radio spectrum, supporting that the radio emission is from transient ejecta (outflows) of corona; however, the jet contribution cannot be entirely ruled out. Our highly super-Eddington sources (log ) have a flatter radio spectrum, along with its low radio luminosity: ; their radio emission is likely dominated by a magnetized corona, and a radiation-pressure-caused jet is also proposed in this paper.
KeywordSupermassive black holes Active galaxies Jets Active galactic nuclei
DOI10.3847/1538-4357/abb775
Language英语
WOS IDIOP:0004-637X-904-2-abb775
PublisherThe American Astronomical Society
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Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/61085
Collection中国科学院国家天文台
Corresponding AuthorYang,Xiaolong
Affiliation1.Kavli Institute for Astronomy and Astrophysics, Peking University, Beijing 100871, People’s Republic of China; yxl.astro@gmail.com
2.Shanghai Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 200030 Shanghai, People’s Republic of China
3.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, People’s Republic of China
4.Department of Space, Earth and Environment, Chalmers University of Technology, Onsala Space Observatory, SE-439 92 Onsala, Sweden
5.Department of Astronomy, School of Physics, Peking University, Beijing 100871, People’s Republic of China
6.Xinjiang Astronomical Observatory, Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, 150 Science 1-Street, 830011 Urumqi, People’s Republic of China
7.Netherlands Institute for Radio Astronomy ASTRON, NL-7991 PD Dwingeloo, The Netherlands
8.Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Chinese Academy of Sciences, 200030 Shanghai, People’s Republic of China
Recommended Citation
GB/T 7714
Yang,Xiaolong,Yao,Su,Yang,Jun,et al. Radio Activity of Supermassive Black Holes with Extremely High Accretion Rates[J]. The Astrophysical Journal,2020,904(2).
APA Yang,Xiaolong.,Yao,Su.,Yang,Jun.,Ho,Luis C..,An,Tao.,...&Joshi,Ravi.(2020).Radio Activity of Supermassive Black Holes with Extremely High Accretion Rates.The Astrophysical Journal,904(2).
MLA Yang,Xiaolong,et al."Radio Activity of Supermassive Black Holes with Extremely High Accretion Rates".The Astrophysical Journal 904.2(2020).
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