Origin of Multi-band Emission from the Microquasar Cygnus X--1

Abstract

We study the origin of non-thermal emissions from the Galactic black hole X-ray binary Cygnus X--1 which is a confirmed high mass microquasar. By analogy with those methods used in studies of active galactic nuclei, we propose a two-dimensional, time-dependent radiation model from the microquasar Cygnus X--1. In this model, the evolution equation for relativistic electrons in a conical jet are numerically solved by including escape, adiabatic and various radiative losses. The radiative processes involved are synchrotron emission, its self-Compton scattering, and inverse Compton scatterings of an accretion disk and its surrounding stellar companion. This model also includes an electromagnetic cascade process of an anisotropic $\gamma$-$\gamma$ interaction. We study the spectral properties of electron evolution and its emission spectral characteristic at different heights of the emission region located in the jet. We find that radio data from Cygnus X--1 are reproduced by the synchrotron emission, the \emph{Fermi} LAT measurements by the synchrotron emission and Comptonization of photons of the stellar companion, the TeV band emission fluxes by the Comptonization of the stellar photons. Our results show that: (1) Radio emission region extends from the binary system scales to the termination of the jet. (2) The GeV band emissions should originate from the distance close to the binary system scales. (3) The TeV band emissions could be inside the binary system, and these emissions could be probed by the upcoming CTA telescope. (4) The MeV tail emissions, which produces a strongly linearly polarized signal, are emitted inside the binary system. The location of the emissions is very close to the inner region of the jet.

arXiv commentModify a figure(7 Figures, 38 pages. Accepted for publication in the ApJ)

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• The role of fast magnetic reconnection on the radio and gamma-ray emission from the nuclear regions of microquasars and low luminosity AGNs
• A new lepto-hadronic model applied to the first simultaneous multiwavelength data set for Cygnus X--1
• A magnetic reconnection model for explaining the multi-wavelength emission of the microquasars Cyg X-1 and Cyg X-3
• Lepto-hadronic model for the broadband emission of Cygnus X-1
• Cosmic Radio Background from Primordial Black Holes at Cosmic Dawn
• Electron transport with re-acceleration and radiation in the jets of X-ray binaries
• Polarization radiation with turbulent magnetic fields from X-ray binaries
• A simplified approach for reproducing fully relativistic spectra in X-ray binary systems: Application to Cygnus X-1
• Recurrent outbursts revealed in 3XMM J031820.8-663034
• Broadband Emission Spectra from the Cygnus X-3 Jet in the Soft Spectral State