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

Kantzas D, Markoff S, Beuchert T, Lucchini M, Chhotray A, Ceccobello C, Tetarenko AJ, Miller-Jones JCA, Bremer M, Garcia JA, Grinberg , Uttley P, Wilms J (2021)


Publication Type: Journal article

Publication year: 2021

Journal

Book Volume: 500

Pages Range: 2112-2126

Journal Issue: 2

DOI: 10.1093/mnras/staa3349

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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APA:

Kantzas, D., Markoff, S., Beuchert, T., Lucchini, M., Chhotray, A., Ceccobello, C.,... Wilms, J. (2021). 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), 2112-2126. https://doi.org/10.1093/mnras/staa3349

MLA:

Kantzas, Dimitrios, et al. "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 (2021): 2112-2126.

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