Fig. 2: Fittings to the X-ray spectra of OGLE16aaa from XMM-Newton observations at two epochs.
From: X-ray flares from the stellar tidal disruption by a candidate supermassive black hole binary
a XMM-Newton PN spectra for OGLE16aaa along with the best-fitted single blackbody model. Error bars represent 1σ uncertainties calculated using Poisson statistics. The data observed on 9 June 2016 (XMM1) are shown in red, whereas that obtained on 30 November 2016 (XMM2) shown in black. The corresponding data to model radios are shown in b. c The joint 68%, 90%, and 99% confidence contours of the blackbody temperature vs. luminosity for the two observations. The vertical dotted lines represent the best-fitted temperatures. d The best-fitting result by including an additional blackbody component to account for the excess emission at above  ~0.7 keV for the XMM2 data, which is shown in dashed line, and e is the corresponding data/model ratio. f The same as e, but for the data/model ratio from spectral fitting by using an additional power-law component to describe the excess emission.
