Discovery of very high energy gamma-ray emission from the low-frequency-peaked Bl Lacertae object Bl Lacertae RID B-5372-2009
- Albert J
- Aliu E
- Anderhub H
- Antoranz P
- Armada A
- Baixeras C
- Barrio JA
- Bartko H
- Bastieri D
- Becker JK
- Bednarek W
- Berger K
- Bigongiari C
- Biland A
- Bock RK
- Bordas P
- Bosch-Ramon V
- Bretz T
- Britvitch I
- Camara M
- Carmona E
- Chilingarian A
- Coarasa JA
- Commichau S
- Contreras JL
- Cortina J
- Costado MT
- Curtef V
- Danielyan V
- Dazzi F
- De Angelis A
- Delgado C
- Reyes RDL
- De Lotto B
- Domingo-Santamaria E
- Dorner D
- Doro M
- Errando M
- Fagiolini M
- Ferenc D
- Fernandez E
- Firpo R
- Flix J
- Fonseca MV
- Font L
- Fuchs M
- Galante N
- Garcia-Lopez R
- Garczarczyk M
- Gaug M
- Giller M
- Goebel F
- Hakobyan D
- Hayashida M
- Hengstebeck T
- Herrero A
- Hohne D
- Hose J
- Hsu CC
- Jacon P
- Jogler T
- Kosyra R
- Kranich D
- Kritzer R
- Laille A
- Lindfors E
- Lombardi S
- Longo F
- Lopez J
- Lopez M
- Lorenz E
- Majumdar P
- Maneva G
- Mannheim K
- Mansutti O
- Mariotti M
- Martinez M
- Mazin D
- Merck C
- Meucci M
- Meyer M
- Miranda JM
- Mirzoyan R
- Mizobuchi S
- Moralejo A
- Nilsson K
- Ninkovic J
- Ona-Wilhelmi E
- Otte N
- Oya I
- Paneque D
- Panniello M
- Paoletti R
- Paredes JM
- Pasanen M
- Pascoli D
- Pauss F
- Pegna R
- Persic M
- Peruzzo L
- Piccioli A
- Poller M
- Prandini E
- Puchades N
- Raymers A
- Rhode W
- Ribo M
- Rico J
- Rissi M
- Robert A
- Rugamer S
- Saggion A
- Sanchez A
- Sartori P
- Scalzotto V
- Scapin V
- Schmitt R
- Schweizer T
- Shayduk M
- Shinozaki K
- Shore S.N.
- Sidro N
- Sillanpaa A
- Sobczynska D
- Stamerra A
- Stark LS
- Takalo L
- Temnikov P
- Tescaro D
- Teshima M
- Tonello N
- Torres DF
- Turini N
- Vankov H
- Vitale V
- Wagner RM
- Wibig T
- Wittek W
- Zandanel F
- Zanin R
- Zapatero J
DOIAbstract
The MAGIC collaboration observed BL Lacertae for 22.2 hr during 2005 August to December and for 26 hr during 2006 July to September. The source is the historical prototype and eponym of a class of low-frequency-peaked BL Lacertae (LBL) objects. A very high energy (VHE) gamma-ray signal was discovered with a 5.1 sigma excess in the 2005 data. Above 200 GeV, an integral flux of (0.6 +/- 0.2) x 10(-11) cm(-2) S-1 was measured, corresponding to approximately 3% of the Crab flux. The differential spectrum between 150 and 900 GeV is rather steep with a photon index of -3.6 +/- 0.5. The light curve shows no significant variability during the observations in 2005. For the first time a clear detection of VHE gamma-ray emission from an LBL object was...
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