The proton low-mass microquasar: high-energy emission
| dc.creator | Romero, Gustavo E. | |
| dc.creator | Vila, Gabriela S. | |
| dc.date | 2008-04-29 | |
| dc.date | 2008-07-02 | |
| dc.date.accessioned | 2026-07-07T09:47:49Z | |
| dc.date.available | 2026-07-07T09:47:49Z | |
| dc.description | A population of unidentified gamma-ray sources is forming a structure resembling a halo around the Galactic center. These sources are highly variable, and hence they should be associated with compact objects. Microquasars are objects undergoing accretion with relativistic jets; if such an object has a low-mass, evolved, donor star, it might be found in the Galactic halo. If these low-mass microquasars can generate detectable gamma-ray emission, then they are natural candidates to account for the halo high-energy sources. We aim to construct models for high-energy emission of low-mass microquasars, which could produce a significant luminosity in the gamma-ray domain. We consider that a significant fraction of the relativistic particles in the jets of low-mass microquasars are protons and then we study the production of high-energy emission through proton synchrotron radiation and photopion production. Photopair production and leptonic processes are considered as well. We compute a number of specific models with different parameters to explore the possibilities of this scenario.} We find that important luminosities, in the range of $10^{34}-10^{37}$ erg s$^{-1}$, can be achieved by proton synchrotron radiation in the Gamma-Ray Large Area Space Telescope (GLAST) energy range, and lower, but still significant luminosities at higher energies for some models. We conclude that the "proton microquasar" model offers a very interesting alternative to account for the halo gamma-ray sources and presents a variety of predictions that might be tested in the near future by instruments like GLAST, the High-Energy Stereoscopic System II (HESS II), the Major Atmospheric Gamma-ray Imaging Cherenkov telescope II (MAGIC II), and neutrino telescopes like IceCube. | |
| dc.description | 11 pages, 7 figures, final version, accepted for publication in A&A | |
| dc.identifier | https://arxiv.org/abs/0804.4606 | |
| dc.identifier | http://arxiv.org/abs/0804.4606 | |
| dc.identifier | Astronomy & Astrophysics 485, 623-634 (2008) | |
| dc.identifier | doi:10.1051/0004-6361:200809563 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/163984 | |
| dc.subject | Astrophysics | |
| dc.title | The proton low-mass microquasar: high-energy emission | |
| dc.type | text |