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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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Dexter, Jason1, Autor           
Xin, Shuo, Autor
Shen, Yue, Autor
Grier, C. J., Autor
Liu, Teng2, Autor           
Gezari, Suvi, Autor
McGreer, Ian D., Autor
Brandt, W. N., Autor
Hall, P. B., Autor
Horne, Keith, Autor
Simm, Torben2, Autor           
Merloni, Andrea2, Autor           
Green, Paul J., Autor
Vivek, M., Autor
Trump, Jonathan R., Autor
Homayouni, Yasaman, Autor
Peterson, B. M., Autor
Schneider, Donald P., Autor
Kinemuchi, K., Autor
Pan, Kaike, Autor
Bizyaev, Dmitry, Autor mehr..
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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 Zusammenfassung: 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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 Datum: 2019-10-29
 Publikationsstatus: Online veröffentlicht
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 Identifikatoren: DOI: 10.3847/1538-4357/ab4354
Anderer: LOCALID: 3186690
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Titel: The Astrophysical Journal
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: Bristol; Vienna : IOP Publishing; IAEA
Seiten: - Band / Heft: 885 (1) Artikelnummer: 44 Start- / Endseite: - Identifikator: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3