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The radio detection...
The radio detection and accretion properties of the peculiar nuclear transient AT 2019avd
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- Wang, Yanan (author)
- University of Southampton
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- Baldi, Ranieri D. (author)
- University of Southampton,Istituto nazionale di astrofisica (INAF)
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- Del Palacio, Santiago, 1990 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
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- Guolo, Muryel (author)
- Johns Hopkins University
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- Yang, Xiaolong (author)
- Chinese Academy of Sciences
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- Zhang, Yangkang (author)
- Chinese Academy of Sciences
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- Done, Chris (author)
- Durham University
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- Pasham, Dheeraj R. (author)
- Massachusetts Institute of Technology (MIT)
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- Qiao, Erlin (author)
- Chinese Academy of Sciences
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- Jiang, Ning (author)
- University of Science and Technology of China
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- Yan, Hongliang (author)
- Chinese Academy of Sciences
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- Panessa, Francesca (author)
- Istituto nazionale di astrofisica (INAF)
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- Jin, Chichuan (author)
- Chinese Academy of Sciences
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- Shen, Rongfeng (author)
- Sun Yat-Sen University
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- Dai, Lixin (author)
- The University of Hong Kong
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(creator_code:org_t)
- 2023-01-11
- 2023
- English.
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In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 520:2, s. 2417-2435
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Abstract
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- AT 2019avd is a nuclear transient detected from infrared to soft X-rays, though its nature is yet unclear. The source has shown two consecutive flaring episodes in the optical and the infrared bands, and its second flare was covered by X-ray monitoring programs. During this flare, the UVOT/Swift photometries revealed two plateaus: one observed after the peak and the other one appeared similar to 240 d later. Meanwhile, our NICER and XRT/Swift campaigns show two declines in the X-ray emission, one during the first optical plateau and one 70-90 d after the optical/UV decline. The evidence suggests that the optical/UV could not have been primarily originated from X-ray reprocessing. Furthermore, we detected a timelag of similar to 16-34 d between the optical and UV emission, which indicates the optical likely comes from UV reprocessing by a gas at a distance of 0.01-0.03 pc. We also report the first VLA and VLBA detection of this source at different frequencies and different stages of the second flare. The information obtained in the radio band - namely a steep and a late-time inverted radio spectrum, a high brightness temperature and a radio-loud state at late times - together with the multiwavelength properties of AT 2019avd suggests the launching and evolution of outflows such as disc winds or jets. In conclusion, we propose that after the ignition of black hole activity in the first flare, a super-Eddington flaring accretion disc formed and settled to a sub-Eddington state by the end of the second flare, associated with a compact radio outflow.
Subject headings
- NATURVETENSKAP -- Fysik -- Subatomär fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Subatomic Physics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)
Keyword
- accretion discs
- black hole physics
- galaxies: nuclei
- radio continuum: transients
- accretion
- galaxies: active
Publication and Content Type
- art (subject category)
- ref (subject category)
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- By the author/editor
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Wang, Yanan
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Baldi, Ranieri D ...
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Del Palacio, San ...
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Guolo, Muryel
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Yang, Xiaolong
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Zhang, Yangkang
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Done, Chris
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Pasham, Dheeraj ...
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Qiao, Erlin
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Jiang, Ning
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Yan, Hongliang
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Panessa, Frances ...
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Jin, Chichuan
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Shen, Rongfeng
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Dai, Lixin
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NATURAL SCIENCES
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and Atom and Molecul ...
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NATURAL SCIENCES
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Chalmers University of Technology