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    A new lepto-hadronic model applied to the first simultaneous multiwavelength data set for Cygnus X-1

    89852.pdf (1.319Mb)
    Access Status
    Open access
    Authors
    Kantzas, D.
    Markoff, S.
    Beuchert, T.
    Lucchini, M.
    Chhotray, A.
    Ceccobello, C.
    Tetarenko, A.J.
    Miller-Jones, James
    Bremer, M.
    Garcia, J.A.
    Grinberg, V.
    Uttley, P.
    Wilms, J.
    Date
    2020
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Kantzas, D. and Markoff, S. and Beuchert, T. and Lucchini, M. and Chhotray, A. and Ceccobello, C. and Tetarenko, A.J. et al. 2020. A new lepto-hadronic model applied to the first simultaneous multiwavelength data set for Cygnus X-1. Monthly Notices of the Royal Astronomical Society. 500 (2): pp. 2112-2126.
    Source Title
    Monthly Notices of the Royal Astronomical Society
    DOI
    10.1093/mnras/staa3349
    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/FT140101082
    Remarks

    This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/90028
    Collection
    • Curtin Research Publications
    Abstract

    Cygnus X-1 is the first Galactic source confirmed to host an accreting black hole. It has been detected across the entire electromagnetic spectrum from radio to GeV gamma-rays. The source's radio through mid-infrared radiation is thought to originate from the relativistic jets. The observed high degree of linear polarization in the MeV X-rays suggests that the relativistic jets dominate in this regime as well, whereas a hot accretion flow dominates the soft X-ray band. The origin of the GeV non-thermal emission is still debated, with both leptonic and hadronic scenarios deemed to be viable. In this work, we present results from a new semi-analytical, multizone jet model applied to the broad-band spectral energy distribution of Cygnus X-1 for both leptonic and hadronic scenarios. We try to break this degeneracy by fitting the first-ever high-quality, simultaneous multiwavelength data set obtained from the CHOCBOX campaign (Cygnus X-1 Hard state Observations of a Complete Binary Orbit in X-rays). Our model parametrizes dynamical properties, such as the jet velocity profile, the magnetic field, and the energy density. Moreover, the model combines these dynamical properties with a self-consistent radiative transfer calculation including secondary cascades, both of leptonic and hadronic origin. We conclude that sensitive TeV gamma-ray telescopes like Cherenkov Telescope Array (CTA) will definitively answer the question of whether hadronic processes occur inside the relativistic jets of Cygnus X-1.

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