2019ApJ...873...92B


Query : 2019ApJ...873...92B

2019ApJ...873...92B - Astrophys. J., 873, 92-92 (2019/March-1)

The broad absorption line tidal disruption event iPTF15af: optical and ultraviolet evolution.

BLAGORODNOVA N., CENKO S.B., KULKARNI S.R., ARCAVI I., BLOOM J.S., DUGGAN G., FILIPPENKO A.V., FREMLING C., HORESH A., HOSSEINZADEH G., KARAMEHMETOGLU E., LEVAN A., MASCI F.J., NUGENT P.E., PASHAM D.R., VEILLEUX S., WALTERS R., YAN L. and ZHENG W.

Abstract (from CDS):

We present multiwavelength observations of the tidal disruption event (TDE) iPTF15af, discovered by the intermediate Palomar Transient Factory survey at redshift z = 0.07897. The optical and ultraviolet (UV) light curves of the transient show a slow decay over 5 months, in agreement with previous optically discovered TDEs. It also has a comparable blackbody peak luminosity of Lpeak~1.5×1044ergs–1. The inferred temperature from the optical and UV data shows a value of (3-5) x 104 K. The transient is not detected in X-rays up to LX< 3×1042ergs–1 within the first 5 months after discovery. The optical spectra exhibit two distinct broad emission lines in the He II region, and at later times also Hα emission. Additionally, emission from [N III] and [O III] is detected, likely produced by the Bowen fluorescence effect. UV spectra reveal broad emission and absorption lines associated with high-ionization states of N V, C IV, Si IV, and possibly P V. These features, analogous to those of broad absorption line quasars (BAL QSOs), require an absorber with column densities NH> 1023 cm–2. This optically thick gas would also explain the nondetection in soft X-rays. The profile of the absorption lines with the highest column density material at the largest velocity is opposite that of BAL QSOs. We suggest that radiation pressure generated by the TDE flare at early times could have provided the initial acceleration mechanism for this gas. Spectral UV line monitoring of future TDEs could test this proposal.

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

Journal keyword(s): accretion, accretion disks - black hole physics - galaxies: nuclei - stars: individual: iPTF15af

VizieR on-line data: <Available at CDS (J/ApJ/873/92): table2.dat table3.dat sp/*>

Simbad objects: 10

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Number of rows : 10
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 SN 2016ezh SN* 01 58 04.750 -00 52 21.89           SNII 58 0
3 PTF 15af SN* 08 48 28.13 +22 03 33.4           ~ 44 0
4 SDSS J084828.13+220333.5 G 08 48 28.1442457200 +22 03 33.541909668           ~ 6 0
5 PS1-11af ev 09 57 26.815 +03 14 01.00           ~ 66 0
6 LEDA 43234 AG? 12 48 15.2253025968 +17 46 26.475426228   16.5       ~ 254 0
7 QSO B1254+0443 QSO 12 56 59.9234909976 +04 27 34.411850136   16.53 16.25     ~ 157 0
8 PS1-10jh ev 16 09 28.296 +53 40 23.52           ~ 133 0
9 [VV2006] J164148.2+223224 QSO 16 41 48.1979979264 +22 32 25.215659808   19.44 19.24     ~ 34 0
10 ASASSN -15oi SN* 20 39 09.096 -30 45 20.71           ~ 126 0

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