Discovery of very high-energy gamma-ray emission from the LBL object BL Lacertae

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dc.creatorMAGIC Collaboration
dc.creatorHayashida, M.
dc.creatorBerger, K.
dc.creatorLindfors, E.
dc.creatorVitale, V.
dc.creatorWagner, R.
dc.creatorLorenz, E.
dc.date2007-09-14
dc.date.accessioned2026-07-07T08:29:39Z
dc.date.available2026-07-07T08:29:39Z
dc.descriptionThe low-frequency peaked BL Lac (LBL) object BL Lacertae was observed with the MAGIC telescope from 2005 August to December (22.2 hr), and from 2006 July to September (26.0 hr). 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)x10e-11 m-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 obtained. The 2006 data show no significant excess. This drop in flux follows the observed trend in optical activity
dc.description4 pages, 5 figures, to appear in the proceedings of the 30th International Cosmic Ray Conference, Merida, July 2007, on behalf of the MAGIC Collaboration
dc.identifierhttps://arxiv.org/abs/0709.2265
dc.identifierhttp://arxiv.org/abs/0709.2265
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/138011
dc.subjectAstrophysics
dc.titleDiscovery of very high-energy gamma-ray emission from the LBL object BL Lacertae
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