Bibcode
DOI
Albert, J.; Aliu, E.; Anderhub, H.; Antoranz, P.; Armada, A.; Baixeras, C.; Barrio, J. A.; Bartko, H.; Bastieri, D.; Becker, J. K.; Bednarek, W.; Berger, K.; Bigongiari, C.; Biland, A.; Bock, R. K.; Bordas, P.; Bosch-Ramon, V.; Bretz, T.; Britvitch, I.; Camara, M.; Carmona, E.; Chilingarian, A.; Coarasa, J. A.; Commichau, S.; Contreras, J. L.; Cortina, J.; Costado, M. T.; Curtef, V.; Danielyan, V.; Dazzi, F.; De Angelis, A.; Delgado, C.; de los Reyes, R.; De Lotto, B.; Domingo-Santamaría, E.; Dorner, D.; Doro, M.; Errando, M.; Fagiolini, M.; Ferenc, D.; Fernández, E.; Firpo, R.; Flix, J.; Fonseca, M. V.; Font, L.; Fuchs, M.; Galante, N.; García-López, R. J.; Garczarczyk, M.; Gaug, M.; Giller, M.; Goebel, F.; Hakobyan, D.; Hayashida, M.; Hengstebeck, T.; Herrero, A.; Höhne, D.; Hose, J.; Hsu, C. C.; Jacon, P.; Jogler, T.; Kosyra, R.; Kranich, D.; Kritzer, R.; Laille, A.; Lindfors, E.; Lombardi, S.; Longo, F.; López, J.; López, M.; Lorenz, E.; Majumdar, P.; Maneva, G.; Mannheim, K.; Mansutti, O.; Mariotti, M.; Martínez, M.; Mazin, D.; Merck, C.; Meucci, M.; Meyer, M.; Miranda, J. M.; Mirzoyan, R.; Mizobuchi, S.; Moralejo, A.; Nieto, D.; Nilsson, K.; Ninkovic, J.; Oña-Wilhelmi, E.; Otte, N.; Oya, I.; Paneque, D.; Panniello, M.; Paoletti, R.; Paredes, J. M.; Pasanen, M.; Pascoli, D.; Pauss, F.; Pegna, R.; Perlman, E. et al.
Bibliographical reference
The Astrophysical Journal, Volume 667, Issue 1, pp. L21-L24.
Advertised on:
9
2007
Journal
Citations
125
Refereed citations
98
Description
We report on the discovery of very high energy (VHE) γ-ray
emission from the BL Lacertae object 1ES 1011+496. The observation was
triggered by an optical outburst in 2007 March and the source was
observed with the MAGIC telescope from 2007 March to May. Observing for
18.7 hr, we find an excess of 6.2 σ with an integrated flux above
200 GeV of (1.58 +/- 0.32) × 10-11 photons
cm-2 s-1. The VHE γ-ray flux is >40%
higher than in 2006 March-April (reported elsewhere), indicating that
the VHE emission state may be related to the optical emission state. We
have also determined the redshift of 1ES 1011+496 based on an optical
spectrum that reveals the absorption lines of the host galaxy. The
redshift of z=0.212 makes 1ES 1011+496 the most distant source observed
to emit VHE γ-rays to date.