Abstract Details
| Name: Anjana C Affiliation: University of Calicut, Thenhipalam Conference ID: ASI2019_489 Title : BROADBAND X-RAY SPECTRAL STUDY OF ULTRALUMINOUS X-RAY SOURCE M81 X–6 Authors and Co-Authors : Anjana C and Dr. Jithesh. V (Post-Doctoral Fellow, IUCAA, Pune) Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : Ultraluminous X-ray sources (ULXs) are the fascinating class of X-ray sources with isotropic luminosity > 10 39 erg s −1 . Their properties have been widely explained in terms of accreting stellar-mass black holes (SMBHs), intermediate-mass black holes (IMBHs) or neutron stars (NSs). We investigated the broadband X-ray spectral properties of ULX M81 X–6 using simultaneous Suzaku and NuSTAR observations. In order to understand the spectral shape and nature of the source, we fitted the 0.6–20 keV spectrum of the source with different models, which include the single-components, phenomenological models, and pulsating NS models. Single-component models provide satisfactory fit in many cases but failed to provide realistic fit and constrain the parameters. However, two-component model fit gives a more reasonable description of the data. Among them, disk-Comptonization model suggests that source is in the ultraluminous state and this ULX may have cool accretion disk which is surrounded by an optically thick corona. The spectral fitting with accreting magnetic NSs continuum model provides a statistically acceptable fit, and the spectral parameters and X-ray colours are consistent with other pulsating ULXs, suggest that M81 X–6 is another candidate for pulsating ULXs. |