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STUDY OF ULTRALUMINOUS X-RAY SOURCES IN SOME NEARBY GALAXIES
• 저자
Singha, Akram Chandrajit
• 저널명
The Korean Astronomical Society
• 발행년도
2019
• 권호
V .52, N .1
• 원문보기
We present the results of the spectral and temporal analysis of eight X-ray point sources in five nearby (distance ${\sim}10^{39}ergs\;s^{-1}$ except for one source (X-8) with $L_X 10^{40}ergs\;s^{-1}$ . Five of these maybe classified as Ultraluminous X-ray sources (ULXs) with powerlaw photon index within the range, ${\Gamma}{\sim}1.63-2.63$ while the inner disk temperature, kT ~ 0.68 - 1.93 keV, when fitted with the disk blackbody model. The black hole masses harboured by the X-ray point sources were estimated using the disk blackbody model to be in the stellar mass range, however, the black hole mass of one source (X-6) lies within the range $68.37M_{\odot}{\leq}M_{BH}{\leq}176.32M_{\odot}$ , which at the upper limit comes under the Intermediate mass black hole range. But if the emission is considered to be beamed by a factor ~ 5, the black hole mass reduces to ${\sim}75M_{\odot}$ . The timing analysis of these sources does not show the presence of any short term variations in the kiloseconds timescales.