Abstract
We study the spectral properties and accretion flow behavior of an ultraluminous X-ray source M82 X-1 using NuSTAR observations. We use the physical two-component advective flow (TCAF) model to fit the data and to derive the accretion flow properties of the source. From the model fitted parameters, we found that M82 X-1 is harboring an intermediate mass black hole at its centre, where the mass varies from \(156.04^{+13.51}_{-15.30}\) to \(380.96^{+28.38}_{-29.76}\) \(M_\odot \). The error weighed average mass of the black hole is \(273\pm 43\) \(M_\odot \), which accreted in nearly super-Eddington rate. The Compton cloud was compact with a size of \({\sim }13 r_g\) and the shock compression ratio had nearly intermediate values except for the epoch four. These indicate a possible significant mass outflow from the inner region of the disk. The quasi periodic oscillation (QPO) frequencies estimated from the model fitted parameters can reproduce the observed QPOs. The robustness of the model parameters is verified by drawing the confidence contours among them.
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Acknowledgements
We thank the referee for making constructive comments and suggestions. SM thanks M. Brightman for discussions on resolving the source. SM and BP acknowledge Ramanujan Fellowship research grant (file #RJF/2020/000113) by DST-SERB, Government of India, for this research. This research has made use of the NuSTAR Data Analysis Software (nustardas) jointly developed by the ASI Science Data Center (ASDC), Italy, and the California Institute of Technology (Caltech), USA. This research has also made use of data obtained through the High Energy Astrophysics Science Archive Research Center Online Service, provided by NASA/Goddard Space Flight Center.
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Mondal, S., Palit, B. & Chakrabarti, S.K. Study of accretion flows around an ultraluminous X-ray source M82 X-1 using NuSTAR data. J Astrophys Astron 43, 90 (2022). https://doi.org/10.1007/s12036-022-09881-0
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DOI: https://doi.org/10.1007/s12036-022-09881-0