Title:	Constraint on the Accretion of NGC 6946 X-1 Using Broadband X-Ray Data
Authors:	Ghosh, Tanuman Rana, Vikram
Issue Date:	7-Jun-2023
Publisher:	IOP Publishing Ltd.
Citation:	The Astrophysical Journal, 2023, Vol. 949, Article No.: 78
Abstract:	We analyze broadband X-ray data of NGC 6946 X-1 and probe plausible accretion scenarios in this ULX. NGC 6946 X-1 is a persistent soft source with broadband continuum spectra described by two thermal disk components. The cool accretion disk temperature Tcool ∼ 0.2 keV and the presence of a ∼0.9 keV emission/absorption broad feature suggest evidence of an optically thick wind due to supercritical accretion. The hot geometrically modified accretion disk has an inner temperature of Thot ∼ 2 keV with a radially dependent profile T(r) ∝ r−0.5, expected in a slim-disk scenario. Further, the measurement based on a realistic inclination angle of the disk indicates that the mass of the host compact object is comparable to a ∼6–10 M⊙ nonrotating black hole or the system hosts a moderately magnetized neutron star with a B ≲ 2 × 1011 G magnetic field. Overall, the detected spectral curvature, high luminosity, flux contribution from two thermal disk components, and estimated accretion rate support the super-Eddington accretion scenario.
Description:	Open Access
URI:	http://hdl.handle.net/2289/8108
ISSN:	0004-637X 1538-4357(Online)
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2023ApJ...949...78G/abstract https://arxiv.org/abs/2301.09837 http://dx.doi.org/10.3847/1538-4357/acccf4 https://inspirehep.net/literature/2626143
Copyright:	2023 The Author(s)
Appears in Collections:	Research Papers (A&A)

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