2019ApJ...879..119H


Query : 2019ApJ...879..119H

2019ApJ...879..119H - Astrophys. J., 879, 119-119 (2019/July-2)

Discovery of highly blueshifted broad Balmer and metastable helium absorption lines in a tidal disruption event.

HUNG T., CENKO S.B., ROTH N., GEZARI S., VEILLEUX S., VAN VELZEN S., GASKELL C.M., FOLEY R.J., BLAGORODNOVA N., YAN L., GRAHAM M.J., BROWN J.S., SIEBERT M.R., FREDERICK S., WARD C., GATKINE P., GAL-YAM A., YANG Y., SCHULZE S., DIMITRIADIS G., KUPFER T., SHUPE D.L., RUSHOLME B., MASCI F.J., RIDDLE R., SOUMAGNAC M.T., VAN ROESTEL J. and DEKANY R.

Abstract (from CDS):

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 Hα emission in a spherically expanding medium without invoking the typical prescription of an elliptical disk. We also report the appearance of narrow (∼1000 kms–1) N III λ4640, He II λ4686, Hα, and Hβ 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.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): accretion, accretion disks - black hole physics - galaxies: nuclei - ultraviolet: general

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 AT 2016fnl ev 00 29 57.050 +32 53 37.27           ~ 100 0
2 ATLAS 18nej ev 07 56 54.537 +34 15 43.61           ~ 63 0
3 SDSS J075654.53+341543.6 G 07 56 54.5382395520 +34 15 43.641537336           ~ 4 0
4 PTF 15af SN* 08 48 28.13 +22 03 33.4           ~ 44 0
5 PS1-11af ev 09 57 26.815 +03 14 01.00           ~ 66 0
6 ASASSN -14ae SN* 11 08 40.11 +34 05 52.4           ~ 104 0
7 LEDA 43234 AG? 12 48 15.2253025968 +17 46 26.475426228   16.5       ~ 254 0
8 Mrk 231 Sy1 12 56 14.2341182928 +56 52 25.238373852   14.68 13.84     ~ 1973 3
9 QSO B1254+0443 QSO 12 56 59.9234909976 +04 27 34.411850136   16.53 16.25     ~ 157 0
10 LEDA 50824 Sy1 14 13 48.3306274368 +44 00 14.003371296   14.99 14.99     ~ 382 0
11 PS1-10jh ev 16 09 28.296 +53 40 23.52           ~ 133 0
12 PTF 09djl SN* 16 33 55.94 +30 14 16.3           SNII 60 0

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