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The MAGIC highlights of the gamma ray binary LS I +61 303 | | T. Jogler
; N. Puchades
; O. Blanch Bigas
; V. Bosch-Ramon
; J. Cortina
; J. Moldón
; J. M. Paredes
; M. A. Perez-Torres
; M. Ribó
; J. Rico
; D. F. Torres
; V. Zabalza
; MAGIC collaboration
; | | Date: |
6 Jul 2009 | | Abstract: | The discovery of emission of TeV gamma rays from X-ray binaries has triggered
an intense effort to better understand the particle acceleration, absorption,
and emission mechanisms in compact binary systems. Here we present the
pioneering effort of the MAGIC collaboration to understand the very high energy
emission of the prototype system LS I +61 303. We report on the variable nature
of the emission from LS I +61 303 and show that this emission is indeed
periodic. The system shows regular outburst at TeV energies in phase
phi=0.6-0.7 and detect no signal at periastron (phi~ 0.275). Furthermore we
find no indication of spectral variation along the orbit of the compact object
and the spectral energy distribution is compatible with a simple power law with
index Gamma=2.6+-0.2_(stat)+-0.2_(sys). To answer some of the open questions
concerning the emission process of the TeV radiation we conducted a
multiwavelength campaign with the MAGIC telescope, XMM-Newton, and Swift in
September 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 linear
fit 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 the
obtained results to the emission processes in the system. | | Source: | arXiv, 0907.0992 | | Services: | Forum | Review | PDF | Favorites | |
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