Discovery of Very High Energy γ-Rays from Markarian 180 Triggered by an Optical Outburst
Open Access
- 22 August 2006
- journal article
- Published by American Astronomical Society in The Astrophysical Journal
- Vol. 648 (2) , L105-L108
- https://doi.org/10.1086/508020
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 γ-ray emission was detected with a significance of 5.5 σ. An integral flux above 200 GeV of (2.3 ± 0.7) × 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 -3.3 ± 0.7 has been determined. No significant flux variation was found.status: publisheKeywords
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This publication has 34 references indexed in Scilit:
- Discovery of Very High Energy Gamma Rays from 1ES 1218+30.4The Astrophysical Journal, 2006
- A low level of extragalactic background light as revealed by γ-rays from blazarsNature, 2006
- Observation of Very High Energy Gamma‐Ray Emission from the Active Galactic Nucleus 1ES 1959+650 Using the MAGIC TelescopeThe Astrophysical Journal, 2006
- Observations of 54 Active Galactic Nuclei with the HEGRA system of Cherenkov telescopesAstronomy & Astrophysics, 2004
- Methods for multidimensional event classification: a case study using images from a Cherenkov gamma-ray telescopeNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2004
- TeV candidate BL Lac objectsAstronomy & Astrophysics, 2002
- Random ForestsMachine Learning, 2001
- First results on the performance of the HEGRA IACT arrayAstroparticle Physics, 1997
- Model for the High-Energy Emission from BlazarsThe Astrophysical Journal, 1993
- Comparative investigation of unfolding methodsNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1991