Exploring the case for hard-X-ray beaming in NGC 6946 X-1
Beuchert T, Middleton MJ, Soria R, Miller-Jones JC, Dauser T, Roberts TP, Sathyaprakash R, Markoff S (2024)
Publication Type: Journal article
Publication year: 2024
Journal
Book Volume: 534
Pages Range: 645-654
Journal Issue: 1
Abstract
In order to understand the nature of super-Eddington accretion we must explore both the emission emerging directly from the inflow and its impact on the surroundings. In this paper, we test whether we can use the optical line emission of spatially resolved, ionized nebulae around ultraluminous X-ray sources (ULXs) as a proxy for their X-ray luminosity. We choose the ULX NGC 6946 X-1 and its nebula, MF16, as a test case. By studying how the nebular optical line emission responds to assumed irradiation, we can infer the degree to which we require the UV or X-ray emission from the inflow to be collimated by optically thick winds seemingly ubiquitously associated with ULXs. We find that the nebula is highly sensitive to compact UV emission but mostly insensitive to hard X-rays. Our attempts to quantify the beaming of the soft and hard X-rays therefore strongly depends on the UV luminosity of the ULX in the centre of the nebula. We find that it is not possible to conclude a lack of geometrical beaming of hard X-rays from such sources via nebula feedback.
Authors with CRIS profile
Involved external institutions
University of Amsterdam
Netherlands (NL)
University of Southampton
United Kingdom (GB)
National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF)
Italy (IT)
International Centre for Radio Astronomy Research
Australia (AU)
Durham University
United Kingdom (GB)
Scuola Superiore Studi Pavia IUSS
Italy (IT)
Netherlands (NL)
University of Southampton
United Kingdom (GB)
National Institute for Astrophysics / Istituto Nazionale Astrofisica (INAF)
Italy (IT)
International Centre for Radio Astronomy Research
Australia (AU)
Durham University
United Kingdom (GB)
Scuola Superiore Studi Pavia IUSS
Italy (IT)
How to cite
APA:
Beuchert, T., Middleton, M.J., Soria, R., Miller-Jones, J.C., Dauser, T., Roberts, T.P.,... Markoff, S. (2024). Exploring the case for hard-X-ray beaming in NGC 6946 X-1. Monthly Notices of the Royal Astronomical Society, 534(1), 645-654. https://doi.org/10.1093/mnras/stae1975
MLA:
Beuchert, Tobias, et al. "Exploring the case for hard-X-ray beaming in NGC 6946 X-1." Monthly Notices of the Royal Astronomical Society 534.1 (2024): 645-654.
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