Bibcode
Aleksić, J.; Alvarez, E. A.; Antonelli, L. A.; Antoranz, P.; Asensio, M.; Backes, M.; Barres de Almeida, U.; Barrio, J. A.; Bastieri, D.; Becerra-González, J.; Bednarek, W.; Berger, K.; Bernardini, E.; Biland, A.; Blanch, O.; Bock, R. K.; Boller, A.; Bonnoli, G.; Borla Tridon, D.; Bosch-Ramon, V.; Bretz, T.; Cañellas, A.; Carmona, E.; Carosi, A.; Colin, P.; Colombo, E.; Contreras, J. L.; Cortina, J.; Cossio, L.; Covino, S.; Da Vela, P.; Dazzi, F.; De Angelis, A.; De Caneva, G.; De Cea del Pozo, E.; De Lotto, B.; Delgado-Mendez, C.; Diago-Ortega, A.; Doert, M.; Domínguez, A.; Dominis Prester, D.; Dorner, D.; Doro, M.; Eisenacher, D.; Elsaesser, D.; Ferenc, D.; Fonseca, M. V.; Font, L.; Fruck, C.; García-López, R. J.; Garczarczyk, M.; Garrido Terrats, D.; Giavitto, G.; Godinović, N.; González Muñoz, A.; Gozzini, S. R.; Hadasch, D.; Häfner, D.; Herrero, A.; Hildebrand, D.; Hose, J.; Hrupec, D.; Huber, B.; Jankowski, F.; Jogler, T.; Kadenius, V.; Kellermann, H.; Klepser, S.; Krähenbühl, T.; Krause, J.; La Barbera, A.; Lelas, D.; Leonardo, E.; Lewandowska, N.; Lindfors, E.; Lombardi, S.; López, M.; López-Coto, R.; López-Oramas, A.; Lorenz, E.; Makariev, M.; Maneva, G.; Mankuzhiyil, N.; Mannheim, K.; Maraschi, L.; Mariotti, M.; Martínez, M.; Mazin, D.; Meucci, M.; Miranda, J. M.; Mirzoyan, R.; Moldón, J.; Moralejo, A.; Munar-Adrover, P.; Niedzwiecki, A.; Nieto, D.; Nilsson, K.; Nowak, N.; Orito, R.; Paiano, S. et al.
Bibliographical reference
The Astrophysical Journal Letters, Volume 754, Issue 1, article id. L10 (2012).
Advertised on:
7
2012
Citations
34
Refereed citations
19
Description
The very high energy (VHE) γ-ray source HESS J0632+057 has
recently been confirmed to be a γ-ray binary. The optical
counterpart is the Be star MWC 148, and a compact object of unknown
nature orbits it every ~321 days 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 γ-ray
emission during 2011 February, when the system exhibited an X-ray
outburst. We find no γ-ray signal in the other observation periods
when the system did not show increased X-ray flux. Thus, HESS J0632+057
exhibits γ-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 γ-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 γ-ray binary LS
I +61°303 and discuss the possible origin of the multi-wavelength
emission of the source.
Related projects
Particle Astrophysics
The MAGIC Collaboration is integrated by 20 research institutes and university departments from Armenia, Bulgaria, Finland, Germany, Italy, Poland, Spain, Switzerland and USA. The collaboration comprises two 17m diameter telescopes, located at the Roque de los Muchachos Observatory, designed to measure the Cherenkov radiation associated with
Ramón
García López