Other
Scientific paper
Apr 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt.........8b&link_type=abstract
Tesis Doctorals en Xarxa
Other
Binary Systems, X-Ray Sources, Stellar Winds, Non-Thermal Processes, Gamma-Ray Theory, Multiwavelength
Scientific paper
Microquasars are X-ray binary systems that present relativistic radio jets.
These systems consist on a normal star and a compact object, where the latter accretes matter from the former powering the mentioned relativistic jets.
Microquasars are known to emit at all the wavelengths from radio to soft gamma-ray energies. Moreover, these objects are nowadays turning out as a new galactic population of high-energy and very high energy gamma-ray emitters.
Although the mechanisms behind gamma-ray emission are still not known, it seems that the production site should be the jet itself.
We have explored several scenarios linked to gamma-ray production, modeling the non-thermal radiation produced in microquasar jets in the entire spectrum, from radio to TeV energies. We have developed leptonic models to reproduce the emission thought to come from the inner parts of the jet, close to the compact object, taking also into account the radiation at lower energies. Moreover, we have studied the extended broadband emission that could be produced via leptonic and hadronic interactions in nearby clouds bombarded by microquasar jet accelerated protons.
We show that microquasars could be behind a significant fraction of the gamma and cosmic rays generated within the Galaxy. Gamma-ray emission from jets could be observed presenting complicated spectra and patterns of variability. The emission should be affected by variable accretion and jet ejection, particle acceleration changes, photon photon absorption in dense ambient photon fields, and other effects linked to the geometry involved in the emitting and absorbing processes. Concerning extended emission from microquasar nearby regions, radiation, convection and diffusion timescales, as well as the particle acceleration efficiencies, are of primary importance to characterize their emission properties.
Multiwavelength and multiparticle observations are required to properly understand the involved physics. This will be possible with the new instrumentation at work or to come, which will allow to improve theoretical modeling up to unexpected levels.
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