Simultaneous X-ray/UV Observations of Ultraluminous X-ray Source Holmberg II X-1 with Indian Space Mission Astrosat
Vinokurov, A.;
Solovyeva, Y.;
Atapin, K.;
Sutaria, F.;
Murthy, J.;
Fabrika, S.;
Kostenkov, A.;
Sarkisyan, A.;
Rahna, P. T.;
Bordoloi, O. P.;
Kashyap, U.;
Chakraborty, M.;
Safonova, M.;
Gogoi, R.
Russia, India, China
Abstract
We present the results of eight epochs of simultaneous UV and X-ray observations of the highly variable ultraluminous X-ray source (ULX) Holmberg II X-1 with AstroSat—Indian multiwavelength space satellite. During the entire observation period from late 2016 to early 2020, Holmberg II X-1 showed a moderate X-ray luminosity about of $$8 \times {{10}^{{39}}}$$ erg s$$^{{ - 1}}$$ and a hard power-law spectrum with $$\Gamma \lesssim 1.9$$. Due to low variability of the object in X-rays (by a factor 1.5) and insignificant variability in the UV range (upper limit approximately 25%) we could not find reliable correlation between flux changes in these ranges. Inside each particular observation, the X-ray variability amplitude is higher, reaching a factor of 2–3 respect to the mean level, however, it is observed in the form of relatively short stochastic bursts. We discussed our results in terms of three models of a heated donor star, a heated disk and a heated wind, and estimated the lower limit to the variability which would allow to reject at least part of them.
2022
•
Astrophysical Bulletin
XMM-Newton
3
