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    Exploring the case for hard-X-ray beaming in NGC 6946 X-1

    96989.pdf (1.475Mb)
    Access Status
    Open access
    Authors
    Beuchert, T.
    Middleton, M.J.
    Soria, R.
    Miller-Jones, James
    Dauser, T.
    Roberts, T.P.
    Sathyaprakash, R.
    Markoff, S.
    Date
    2024
    Type
    Journal Article
    
    Metadata
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    Citation
    Beuchert, T. and Middleton, M.J. and Soria, R. and Miller-Jones, J.C.A. and Dauser, T. and Roberts, T.P. and Sathyaprakash, R. et al. 2024. Exploring the case for hard-X-ray beaming in NGC 6946 X-1. Monthly Notices of the Royal Astronomical Society. 534 (1): pp. 645-654.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/stae1975
    ISSN
    0035-8711
    Faculty
    Faculty of Science and Engineering
    School
    School of Elec Eng, Comp and Math Sci (EECMS)
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/DP200102471
    URI
    http://hdl.handle.net/20.500.11937/97225
    Collection
    • Curtin Research Publications
    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.

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