Optical variability of the accretion disk around the intermediate mass black hole ESO 243-49 HLX-1 during the 2012 outburst

Дата и время публикации : 2013-11-27T09:49:14Z

Авторы публикации и институты :
N. A. Webb
O. Godet
K. Wiersema
J. -P. Lasota
D. Barret
S. A. Farrell
T. J. Maccarone
M. Servillat

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 9 pages, 2 figures, accepted for publication in ApJL
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE

Краткий обзор статьи: We present dedicated quasi-simultaneous X-ray (Swift) and optical (Very Large Telescope (VLT), V- and R-band) observations of the intermediate mass black hole candidate ESO 243-49 HLX-1 before and during the 2012 outburst. We show that the V-band magnitudes vary with time, thus proving that a portion of the observed emission originates in the accretion disk. Using the first quiescent optical observations of HLX-1, we show that the stellar population surrounding HLX-1 is fainter than V~25.1 and R~24.2. We show that the optical emission may increase before the X-ray emission consistent with the scenario proposed by Lasota et al. (2011) in which the regular outbursts could be related to the passage at periastron of a star circling the intermediate mass black hole in an eccentric orbit, which triggers mass transfer into a quasi-permanent accretion disk around the black hole. Further, if there is indeed a delay in the X-ray emission we estimate the mass-transfer delivery radius to be ~1e11 cm.

Category: Physics