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Title: Detection of VHE γ-Rays from HESS J0632+057 during the 2011 February X-Ray Outburst with the MAGIC Telescopes
Author: Paredes i Poy, Josep Maria
Munar i Adrover, Pere
Ribó Gomis, Marc
Bosch i Ramon, Valentí
Moldón Vara, Francisco Javier
Keywords: Estels binaris de raigs X
Raigs gamma
X-ray binaries
Gamma rays
Issue Date: 5-Jul-2012
Publisher: Institute of Physics (IOP)
Abstract: The very high energy (VHE) \gamma-ray source HESS J0632+057 has recently been confirmed to be a \gamma-ray binary. The optical counterpart is the Be star MWC 148, and a compact object of unknown nature orbits it every ~321 d with a high eccentricity of ~0.8. We monitored HESS J0632+057 with the stereoscopic MAGIC telescopes from 2010 October to 2011 March and detected significant VHE \gamma-ray emission during 2011 February, when the system exhibited an X-ray outburst. We find no \gamma-ray signal in the other observation periods when the system did not show increased X-ray flux. Thus HESS J0632+057 exhibits \gamma-ray variability on timescales of the order of one to two months possibly linked to the X-ray outburst that takes place about 100 days after the periastron passage. Furthermore our measurements provide for the first time the \gamma-ray spectrum down to about 140 GeV and indicate no turnover of the spectrum at low energies. We compare the properties of HESS J0632+057 with the similar \gamma-ray binary LS I +61 303, and discuss on the possible origin of the multi-wavelength emission of the source
Note: Reproducció del document publicat a:
It is part of: Astrophysical Journal Letters, 2012, vol. 754, num. 1, p. 10A
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ISSN: 2041-8205
Appears in Collections:Articles publicats en revistes (Física Quàntica i Astrofísica)

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