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

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

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 hig...

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Bibliographic Details
Main 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.
Format: Journal Article
Language:English
Published: OXFORD UNIV PRESS 2020
Subjects:
Science & Technology
Physical Sciences
Astronomy & Astrophysics
acceleration of particles
radiation mechanisms: non-thermal
X-rays: individual: Cyg X-1
GAMMA-RAY EMISSION
BROAD-BAND SPECTRUM
BL-LAC OBJECTS
PARTICLE-ACCELERATION
MAGNETIC RECONNECTION
RELATIVISTIC JETS
SYNCHROTRON-RADIATION
SHOCK ACCELERATION
RADIO-EMISSION
XTE J1118+480
Online Access:http://purl.org/au-research/grants/arc/FT140101082
http://hdl.handle.net/20.500.11937/90028
Description
Summary: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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