paper

Multiwavelength Study of an X-ray Tidal Disruption Event Candidate in NGC 5092

arXiv:2003.09066 · doi:10.3847/1538-4357/ab744a

Abstract

We present multiwavelength studies of a transient X-ray source, XMMSL1 J131952.3+225958, associated with the galaxy NGC 5092 at detected in the XMM-Newton SLew survey (XMMSL). The source brightened in the 0.2--2 keV band by a factor of in 2005 as compared with previous flux limits and then faded by a factor of as observed with it XMM-Newton in 2013 and with it Swift in 2018. At the flaring state, the X-ray spectrum can be modeled with a blackbody at a temperature of 60 eV and an overall luminosity of erg s. A UV flare and optical flare were also detected with the Galaxy Evolution Explorer and the Sloan Digital Sky Survey, respectively, within several months of the X-ray flare, whose nonstellar UV--optical spectrum can be described with a blackbody at a temperature of K and a luminosity of erg s. Interestingly, mid-infrared monitoring observations of NGC 5092 with the Wide-field Infrared Survey Explorer 5--13 yr later show a continuous flux decline. These dramatic variability properties, from the X-ray through UV and optical to infrared, appear to be orderly, suggestive of a stellar tidal disruption event (TDE) by a massive black hole, confirming the postulation by Kanner et al.(2013). This TDE candidate belongs to a rare sample with contemporaneous bright emission detected in the X-ray, UV, and optical, which are later echoed by dust-reprocessed light in the mid-infrared. The black hole has a mass of , residing in a galaxy that is dominated by a middle-aged stellar population of 2.5 Gyr.

arXiv comment24 pages, 13 figures, accepted for publication in ApJ

References in corpus (87)

Cited by in corpus (11)