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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/151125
Detection of VHE γ-Rays from HESS J0632+057 during the 2011 February X-Ray Outburst with the MAGIC Telescopes
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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
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PAREDES I POY, Josep Maria, et al. Detection of VHE γ-Rays from HESS J0632+057 during the 2011 February X-Ray Outburst with the MAGIC Telescopes. Astrophysical Journal Letters. 2012. Vol. 754, num. 1, pags. 10A. ISSN 2041-8205. [consulted: 11 of October of 2026]. Available at: https://hdl.handle.net/2445/151125