National conference on REcent Trends in the study of Compact Objects (RETCO-V): Theory and Observation

Session

ULX Sources

Apr 5, 2023, 12:15 PM

Auditorium (Kodaikanal Solar Observatory)

Conveners

ULX Sources

• Banibrata Mukhopadhyay (Indian Institute of Science)

49. Revealing the accretion scenarios of BH-ULXs with XMM-Newton

Seshadri Majumder (Indian Institute of Technology, Guwahati)

4/5/23, 12:15 PM

ULX Sources

We present the results of a comprehensive long-term spectro-temporal analysis of nine ultra-luminous X-ray sources (ULXs) with the central object being a black hole, using XMM-Newton monitoring of about a decade. Temporal studies reveal the existence of short-term variability in each source with fractional variance varying in the range of $1.42-27.28$ per cent. Five sources of the sample are...

88. A stellar mass ULX NGC 6946 X-1 and its super-Eddington accretion

Tanuman Ghosh (Raman Research Institute)

4/5/23, 12:30 PM

ULX Sources

Ultraluminous X-ray sources (ULXs) are the brightest known non-nuclear X-ray binaries with luminosities exceeding the classical Eddington limit of a 10 $\rm M_\odot$ black hole. Recent discoveries of neutron star cores in ULXs confirm that the Eddington ratio can be a few hundred. Broadband spectral studies are pivotal to deciphering the emission mechanism in these mysterious sources. Here we...