Artículo
Abstract:
Context. Some high mass X-ray binaries (HMXB) have been recently confirmed as γ-ray sources by ground based Cherenkov telescopes. In this work, we discuss the γ-ray emission from X-ray transient sources formed by a Be star and a highly magnetized neutron star. This kind of systems can produce variable hadronic γ-ray emission through the mechanism proposed by Cheng and Ruderman, where a proton beam accelerated in the pulsar magnetosphere impacts the transient accretion disk. We choose as case of study the best known system of this class: A0535+26. Aims. We aim at making quantitative predictions about the very high-energy radiation generated in Be-X ray binary systems with strongly magnetized neutron stars. Methods. We study the gamma-ray emission generated during a major X-ray outburst of a HMXB adopting for the model the parameters of A0535+26. The emerging photon signal from the disk is determined by the grammage of the disk that modulates the optical depth. The electromagnetic cascades initiated by photons absorbed in the disk are explored, making use of the so-called "Approximation A" to solve the cascade equations. Very high energy photons induce Inverse Compton cascades in the photon field of the massive star. We implemented Monte Carlo simulations of these cascades, in order to estimate the characteristics of the resulting spectrum. Results. TeV emission should be detectable by Cherenkov telescopes during a major X-ray outburst of a binary formed by a Be star and a highly magnetized neutron star. The y-ray light curve is found to evolve in anti-correlation with the X-ray signal. © ESO 2007.
Registro:
| Documento: | Artículo |
| Título: | Very high energy γ-ray emission from X-ray transients during major outbursts |
| Autor: | Orellana, M.; Romero, G.E.; Pellizza, L.J.; Vidrih, S. |
| Filiación: | Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, Paseo del Bosque, 1900 La Plata, Argentina Instituto Argentino de Radioastronomía, C.C.5 (1894) Villa Elisa, Buenos Aires, Argentina Instituto de Astronomía y Física del Espacio, C.C. 67, Suc. 28, 1428 Buenos Aires, Argentina Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, United Kingdom CONICET, Argentina |
| Palabras clave: | Gamma-rays: theory; Stars: individual: A0535+26; X-ray: binaries; Binary sequences; Gamma rays; Magnetization; Magnetosphere; Space telescopes; X rays; Cherenkov telescopes; Gamma ray emission; High mass X-ray binaries (HMXB; Neutron star; Stars |
| Año: | 2007 |
| Volumen: | 465 |
| Número: | 3 |
| Página de inicio: | 703 |
| Página de fin: | 709 |
| DOI: | http://dx.doi.org/10.1051/0004-6361:20066238 |
| Título revista: | Astronomy and Astrophysics |
| Título revista abreviado: | Astron. Astrophys. |
| ISSN: | 00046361 |
| CODEN: | AAEJA |
| Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v465_n3_p703_Orellana |
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Citas:
---------- APA ----------
Orellana, M., Romero, G.E., Pellizza, L.J. & Vidrih, S. (2007) . Very high energy γ-ray emission from X-ray transients during major outbursts. Astronomy and Astrophysics, 465(3), 703-709.http://dx.doi.org/10.1051/0004-6361:20066238
---------- CHICAGO ----------
Orellana, M., Romero, G.E., Pellizza, L.J., Vidrih, S. "Very high energy γ-ray emission from X-ray transients during major outbursts" . Astronomy and Astrophysics 465, no. 3 (2007) : 703-709.http://dx.doi.org/10.1051/0004-6361:20066238
---------- MLA ----------
Orellana, M., Romero, G.E., Pellizza, L.J., Vidrih, S. "Very high energy γ-ray emission from X-ray transients during major outbursts" . Astronomy and Astrophysics, vol. 465, no. 3, 2007, pp. 703-709.http://dx.doi.org/10.1051/0004-6361:20066238
---------- VANCOUVER ----------
Orellana, M., Romero, G.E., Pellizza, L.J., Vidrih, S. Very high energy γ-ray emission from X-ray transients during major outbursts. Astron. Astrophys. 2007;465(3):703-709.http://dx.doi.org/10.1051/0004-6361:20066238
