Spectral study of different black hole candidates and measurement of spin parameter
Abstract
We study different black hole candidates using different satellites (RXTE, Swift and NuSTAR) data.We show how the spectral shape changes with the change in geometry of the disk and accretion rates.Our analysis attempts to explain these using TCAF model fitted physicalparameters. We also explain different spectral states of a complete outburst from the accretionrate behavior. It is evident that the evolution of flow parameters in the decline phase may notretrace path of the rising phase. We shed light on that from our model fitting.The presence of Fe K_{α} line is well detected in accretion diskfor Galactic X-ray sources and active galactic nuclei due to the rotating matter around the central object.We study the presence of Fe K_{α} line emission from the NuSTAR observation of transientsource GX 339-4 during its 2013 outburst. Throughout the outburst, to fit the spectra withTCAF model, we require LAOR model. Our estimated value of spin parameter is 0.99 for this candidate.Chakrabarti, S.K., & Titarchuk, L.G. 1995, ApJ, 455, 623Debnath, D., Chakrabarti, S. K., & Mondal, S. 2014, MNRAS, 440, L121Mondal, S., Debnath, D., & Chakrabarti, S. K. 2014, ApJ, 786, 4Mondal, S., Chakrabarti, S. K., & Debnath, D. 2016, Ap&SS, 361, 309
- Publication:
-
42nd COSPAR Scientific Assembly
- Pub Date:
- July 2018
- Bibcode:
- 2018cosp...42E2326M