Conferència DAM: "Contribution from jets and accretion to broad-band spectra of black-hole binaries"

  • Ponent: Andrzej A. Zdziarski (Centrum Astronomiczne im. M. Kopernika, Bartycka 18, PL-00-716 Warszawa, Poland)
  • Dia - Hora:    11.12.2013 , 12:00:00
  • Lloc:    Seminari DAM
  • Resum:   We study models of compact jets in the hard state of black-hole binaries, in which we self-consistently solve for both the steady state electron distribution and the emitted spectrum in both the self-absorbed and optically thin parts as functions of the height along the jet. We take into account synchrotron emission and absorption, Compton scattering of synchrotron, stellar and accretion-flow photons, adiabatic losses, and absorption of very-high energy gamma-rays by pair production on stellar photons. We find Compton upscattering of blackbody stellar radiation in high-mass X-ray binaries to be a major contributor to their gamma-ray emission. Then measurements and/or upper limits on that emission impose strong constraints on the jet parameters, in particular on their magnetic field. We apply our models to the hard state of Cyg X-1, and find it accounts well for its radio/IR spectrum as well its gamma-ray emission observed by Fermi. The Fermi emission and upper limits also place strong constraints on both leptonic and hadronic accretion models.

 

  • Correu electrònic:    jmparedes @ ub.edu