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  The Sloan Digital Sky Survey Reverberation Mapping Project: accretion and broad emission line physics from a hypervariable quasar

Dexter, J., Xin, S., Shen, Y., Grier, C. J., Liu, T., Gezari, S., et al. (2019). The Sloan Digital Sky Survey Reverberation Mapping Project: accretion and broad emission line physics from a hypervariable quasar. The Astrophysical Journal, 885(1): 44. doi:10.3847/1538-4357/ab4354.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0005-79A3-B Version Permalink: http://hdl.handle.net/21.11116/0000-0005-79A4-A
Genre: Journal Article

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 Creators:
Dexter, Jason1, Author              
Xin, Shuo, Author
Shen, Yue, Author
Grier, C. J., Author
Liu, Teng2, Author              
Gezari, Suvi, Author
McGreer, Ian D., Author
Brandt, W. N., Author
Hall, P. B., Author
Horne, Keith, Author
Simm, Torben2, Author              
Merloni, Andrea2, Author              
Green, Paul J., Author
Vivek, M., Author
Trump, Jonathan R., Author
Homayouni, Yasaman, Author
Peterson, B. M., Author
Schneider, Donald P., Author
Kinemuchi, K., Author
Pan, Kaike, Author
Bizyaev, Dmitry, Author more..
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              
2High Energy Astrophysics, MPI for Extraterrestrial Physics, Max Planck Society, ou_159890              

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 Abstract: We analyze extensive spectroscopic and photometric data of the hypervariable quasar SDSS J141324+530527 (RMID 017) at z = 0.456, an optical "changing-look" quasar from the Sloan Digital Sky Survey Reverberation Mapping project that increased in optical luminosity by a factor ≃10 between 2014 and 2017. The observed broad emission lines all respond in luminosity and width to the changing optical continuum, as expected for photoionization in a stratified, virialized broad emission line region. The luminosity changes therefore result from intrinsic changes in accretion power rather than variable obscuration. The variability is continuous and apparently stochastic, disfavoring an origin as a discrete event such as a tidal disruption flare or microlensing event. It is coordinated on day timescales with blue leading red, consistent with reprocessing powering the entire optical spectral energy distribution. We show that this process cannot work in a standard thin disk geometry on energetic grounds, and would instead require a large covering factor reprocessor. Disk instability models could potentially also explain the data, provided that the instability sets in near the inner radius of a geometrically thick accretion disk.

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 Dates: 2019-10-29
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/ab4354
Other: LOCALID: 3186690
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 885 (1) Sequence Number: 44 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3