Zobrazeno 1 - 10
of 10
pro vyhledávání: '"Guessoum, N."'
We consider the production of positrons in microquasars, i.e. X-ray binary systems that exhibit jets frequently, but not continuously. We estimate the production rate of positrons in microquasars, both by simple energy considerations and in the frame
Externí odkaz:
http://arxiv.org/abs/astro-ph/0607296
Autor:
Weidenspointner, G., Shrader, C. R., Knoedlseder, J., Jean, P., Lonjou, V., Guessoum, N., Diehl, R., Gillard, W., Harris, M. J., Skinner, G. K., von Ballmoos, P., Vedrenne, G., Roques, J. -P., Schanne, S., Sizun, P., Teegarden, B. J., Schoenfelder, V., Winkler, C.
We present a measurement of the sky distribution of positronium (Ps) annihilation continuum emission obtained with the SPI spectrometer on board ESA's INTEGRAL observatory. The only sky region from which significant Ps continuum emission is detected
Externí odkaz:
http://arxiv.org/abs/astro-ph/0601673
Autor:
Jean, P., Knodlseder, J., Gillard, W., Guessoum, N., Ferriere, K., Marcowith, A., Lonjou, V., Roques, J. P.
Publikováno v:
Astron.Astrophys.445:579-589,2006
We present a spectral analysis of the e+e- annihilation emission from the Galactic Centre region based on the first year of measurements made with the spectrometer SPI of the INTEGRAL mission. We have found that the annihilation spectrum can be model
Externí odkaz:
http://arxiv.org/abs/astro-ph/0509298
Autor:
Knödlseder, J., Jean, P., Lonjou, V., Weidenspointner, G., Guessoum, N., Gillard, W., Skinner, G., von Ballmoos, P., Vedrenne, G., Roques, J. -P., Schanne, S., Teegarden, B., Schönfelder, V., Winkler, C.
Publikováno v:
Astron.Astrophys.441:513-532,2005
We present a map of 511 keV electron-positron annihilation emission, based on data accumulated with the SPI spectrometer aboard ESA's INTEGRAL gamma-ray observatory, that covers approximately 95% of the celestial sphere. 511 keV line emission is sign
Externí odkaz:
http://arxiv.org/abs/astro-ph/0506026
We reexamine in detail the various processes undergone by positrons in the ISM from their birth to their annihilation using the most recent results of positron interaction cross sections with H, H2 and He. The positrons' lives are divided into two ph
Externí odkaz:
http://arxiv.org/abs/astro-ph/0504186
Autor:
Lonjou, V., Weidenspointner, G., Knodlseder, J., Jean, P., Allain, M., von Ballmoos, P., Harris, M. J., Roques, J. P., Skinner, G. K., Teegarden, B. J., Gehrels, N., Guessoum, N., Chapuis, C., Durouchoux, Ph., Cisana, E., Valsesia, M.
The status of the analysis of the electron/positron annihilation radiation performed by INTEGRAL/SPI in the 4th GALACTIC QUADRANT is reported. We use data from the first two Galactic Center Deep Exposures (GCDE) and from the Galactic Plane Scans (GPS
Externí odkaz:
http://arxiv.org/abs/astro-ph/0411414
SPI observations of positron annihilation radiation from the 4th galactic quadrant: sky distribution
Autor:
Weidenspointner, G., Lonjou, V., Knoedlseder, J., Jean, P., Allain, M., von Ballmoos, P., Harris, M. J., Skinner, G. K., Vedrenne, G., Teegarden, B. J., Gehrels, N., Guessoum, N., Schoenfelder, V., Chapuis, C., Durouchoux, Ph., Cisana, E., Valsesia, M.
During its first year in orbit the INTEGRAL observatory performed deep exposures of the Galactic Center region and scanning observations of the Galactic plane. We report on the status of our analysis of the positron annihilation radiation from the 4t
Externí odkaz:
http://arxiv.org/abs/astro-ph/0406178
Autor:
Jean, P., Guessoum, N.
We consider the production of 2.22 MeV radiation resulting from the capture of neutrons in the atmosphere of the secondary in an X-ray binary system, where the neutrons are produced in the accretion disk around the compact primary star and radiated i
Externí odkaz:
http://arxiv.org/abs/astro-ph/0109185
Publikováno v:
Astrophysical Letters & Communications. Dec99 Pt 1, Vol. 38 Issue 1-6, p415. 5p.
Autor:
Hamidani, H., Guessoum, N.
Publikováno v:
AIP Conference Proceedings; 10/31/2010, Vol. 1295 Issue 1, p218-221, 4p