Browsing by Author "Allak, Sinan"
Authors:Akyüz, Aysun; Avdan, Şenay; Allak, Sinan; Aksaker, Nazım; Oralhan, İnci Akkaya; Balman, Şölen
Publisher and Date:(Oxford Univ Press, 2020)We present the results of a search for the nature of ultraluminous X-ray source (ULX) X-3 in the nearby galaxy NGC 4258. We use archival data from XMM-Newton, Chandra, NuSTAR, and Hubble Space Telescope (HST) observations. Total X-ray data were analysed to find that the model parameters of the system are indicative of a stellar-mass black hole, similar to 10 M-circle dot, as the central compact object. Furthermore, analyses of the optical data from HST reveal two optical candidates at 90 per cent ...