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Discovery of very high energy gamma-rays from Markarian 180 triggered by an optical outburst\ud

By Pedro Antoranz Canales, Juan Abel Barrio Uña, José Luis Contreras González, Mª Victoria Fonseca González, Marcos López Moya and José Miguel Miranda Pantoja

Abstract

The high-frequency-peaked BL Lacertae object Markarian 180 (Mrk 180) was observed to have an optical outburst in 2006 March, triggering a Target of Opportunity observation with the MAGIC telescope. The source was observed for 12.4 hr, and very high energy gamma-ray emission was detected with a significance of 5.5 sigma. An integral flux above 200 GeV of (2.3 +/- 0.7) x 10(-11) cm(-2) s(-1) was measured, corresponding to 11% of the Crab Nebula flux. A rather soft spectrum with a photon index of has been determined. No significant flux -3.3 x 0.7 variation was found.\u

Topics: Electrónica, Electricidad, Física nuclear
Publisher: IOP Publishing
Year: 2006
DOI identifier: 10.1086/508020
OAI identifier: oai:www.ucm.es:23885
Provided by: EPrints Complutense

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