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Study of Type-B QPOs Observed in Black Hole x-Ray Binary Swift J1728.9-3613

Research in Astronomy and Astrophysics 2024年第3期24卷 1-9页

作者： Raj Kumar Astrophysical Sciences Division Bhabha Atomic Research CentreMumbai 400085India Homi Bhabha National Institute Mumbai 400094India

We report the detection of type-B quasi-periodic oscillation(QPO)of the black hole x-ray binary Swift J1728.9-3613 observed by NICER during the 2019 outburst.A type-B QPO was observed for the first two days and it disappeared as flux increased,but again appeared at∼7.70 Hz when flux was dramatically *** source was found in the soft intermediate state during these *** further studied the energy dependence of the *** found that QPO was observed only for a higher energy range implying that the origin of QPO is possibly due to the corona emitting higher energy photons by the inverse Compton *** variation of spectral parameters can be explained with the disk truncation *** fractional rms was found to be monotonically increased with *** phase lag spectrum followed the“U-shaped”*** rms and phase lag spectrum are modeled and explained with the single-component Comptonization model vkompthdk.

关键词： x-rays binaries-accretion-accretion disks-x-rays individual (Swift J1728.9-3613)

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Broadband Spectral Properties of MAxI J1348-630 using AstroSat Observations

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Research in Astronomy and Astrophysics 2023年第1期23卷 161-170页

作者： Gitika Mall Jithesh Vadakkumthani Ranjeev Misra Center for Field Theory and Particle Physics and Department of Physics Fudan UniversityShanghai 200438China Department of Physics and Electronics CHRIST(Deemed to be University)Hosur Main RoadBengaluru 560029India Inter-University Centre for Astronomy and Astrophysics(IUCAA) PB No.4GaneshkhindPune 411007India

We present broadband x-ray spectral analysis of the black hole x-ray binary MAxI J1348-630,performed using five AstroSat *** source was in the soft spectral state for the first three observations and in the hard state for the last *** three soft state spectra were modeled using a relativistic thin accretion disk with reflection features and thermal *** fitting of the soft state spectra constrained the spin parameter of the black hole a_(*)>0.97 and the disk inclination angle i=32.9_(-0.6)^(+4.1)*** bright and faint hard states had bolometric flux a factor of~6 and~10 less than that of the soft state *** spectra were fitted using the same model except that the inner disk radius was not assumed to be at the last stable ***,the estimated values do not indicate large truncation radii and the inferred accretion rate in the disk was an order of magnitude lower than that of the soft *** with earlier reported temporal analysis,AstroS at data provide a comprehensive picture of the evolution of the source.

关键词： black hole physics-x-rays binaries-accretion-accretion disks-x-rays individual(MAxI J1348-630)

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