期刊
ASTROPHYSICAL JOURNAL
卷 879, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab24de
关键词
accretion, accretion disks; black hole physics; galaxies: nuclei; ultraviolet: general
资金
- NSF [AST-1518052, 1454816]
- Gordon & Betty Moore Foundation
- Heising-Simons Foundation
- David and Lucile Packard Foundation
- Raymond and Beverley Sackler Distinguished Visitor Fellowship
- Institute of Astronomy
- Science and Technology Facilities Council (STFC)
- Kavli Institute for Cosmology, Cambridge
- Netherlands Organisation for Scientific Research (NWO) [016.192.277]
- National Science Foundation Graduate Research Fellowship Program [1842400]
- EU via ERC grant [725161]
- ISF
- BSF Transformative program
- Kimmel award
- Benoziyo Prize Postdoctoral Fellowship
- NASA [NAS 5-26555]
- W. M. Keck Foundation
- National Science Foundation [AST-1440341, 1106171]
- European Research Council (ERC) [725161] Funding Source: European Research Council (ERC)
We report the discovery of nonstellar hydrogen Balmer and metastable helium absorption lines accompanying a transient, high-velocity (0.05c) broad absorption line (BAL) system in the optical spectra of the tidal disruption event (TDE) AT2018zr (z = 0.071). In the Hubble Space Telescope UV spectra, absorption of high-and low-ionization lines is also present at this velocity, making AT2018zr resemble a low-ionization BALQSO. We conclude that these transient absorption features are more likely to arise in fast outflows produced by the TDE than absorbed by the unbound debris. In accordance with the outflow picture, we are able to reproduce the flat-topped Ha emission in a spherically expanding medium without invoking the typical prescription of an elliptical disk. We also report the appearance of narrow (similar to 1000 kms(-1)) N III lambda 4640, He II lambda 4686, H alpha, and H beta emission in the late-time optical spectra of AT2018zr, which may be a result of UV continuum hardening at late times, as observed by Swift. Including AT2018zr, we find a high association rate (three out of four) of BALs in the UV spectra of TDEs. This suggests that outflows may be ubiquitous among TDEs and less sensitive to viewing angle effects compared to QSO outflows.
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