The MAGIC highlights of the gamma ray binary LS I 61 303 - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




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Abstract: The discovery of emission of TeV gamma rays from X-ray binaries has triggeredan intense effort to better understand the particle acceleration, absorption,and emission mechanisms in compact binary systems. Here we present thepioneering effort of the MAGIC collaboration to understand the very high energyemission of the prototype system LS I +61 303. We report on the variable natureof the emission from LS I +61 303 and show that this emission is indeedperiodic. The system shows regular outburst at TeV energies in phasephi=0.6-0.7 and detect no signal at periastron phi~ 0.275. Furthermore wefind no indication of spectral variation along the orbit of the compact objectand the spectral energy distribution is compatible with a simple power law withindex Gamma=2.6+-0.2 stat+-0.2 sys. To answer some of the open questionsconcerning the emission process of the TeV radiation we conducted amultiwavelength campaign with the MAGIC telescope, XMM-Newton, and Swift inSeptember 2007. We detect a simultaneous outburst at X-ray and TeV energies,with the peak at phase 0.62 and a similar shape at both wavelengths. A linearfit to the strictly simultaneous X-ray-TeV flux pairs provides r=0.81 -0.21+0.06. Here we present the observations and discuss the implications of theobtained results to the emission processes in the system.



Author: T. Jogler, N. Puchades, O. Blanch Bigas, V. Bosch-Ramon, J. Cortina, J. Moldón, J. M. Paredes, M. A. Perez-Torres, M. Ribó, J.

Source: https://arxiv.org/







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