Spectral energy distribution, radio maps and polarization of Cygnus X-1: a leptohadronic model.

VILA GABRIELA S.; PEPE CAROLINA; ROMERO GUSTAVO E.

La Plata

Congreso; 58 Reunión de la Asociación Argentina de Astronomía; 2015

Facultad de Ciencias Astronómicas y Geofísicas, UNLP

The microquasar Cygnus X-1 is one of the most studied astrophysical sources. Several radiativemodels for the non-thermal broadband emission of Cygnus X-1 are available. For the jet emission in particular, only leptonic models have been considered despite the observational evidence of the presence of hadrons in the jets of other microquasars. In this work, we present an inhomogeneous, lepto-hadronic jet model for the non-thermal broadband emission of Cygnus X-1. We calculate the contribution to the spectrum of both relativistic electrons and protons, taking into account their interaction with the magnetic eld, matter and photon elds internal and external to the jet. We obtain best-t models for the spectrum that reproduce the observations from radio to gamma rays, including the MeV tail whose origin is still disputed. We also produce synthetic radio maps of thejet and compare them to actual interferometric observations of the source. Finally, we present preliminary results for the degree of polarization of the jet radiation in the MeV band.