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Observation of very high energy gamma-rays from the AGN 1ES 2344+514 in low emission state with the magic telescope

J. Albert
•
E. Aliu
•
H. Anderhub
altro
J. Zapatero
2007
  • journal article

Periodico
THE ASTROPHYSICAL JOURNAL
Abstract
he MAGIC collaboration has observed very high energy gamma-ray emission from the AGN 1ES 2344+514. A gamma-ray signal corresponding to an 11 sigma excess and an integral flux of ( 2.38 +/- 0.30(stat) +/- 0.70(syst)) x 10(-11) cm(-2) s(-1) above 200 GeV has been obtained from 23.1 hr of data taking between 2005 August 3 and 2006 January 1. The data confirm the previously detected gamma-ray emission from this object during a flare seen by the Whipple collaboration in 1995 and the evidence ( below 5 sigma significance level) from long-term observations conducted by the Whipple and HEGRA groups. The MAGIC observations show a relatively steep differential photon spectrum that can be described by a power law with a photon index of alpha = -2.95 +/- 0.12(stat) +/- 0.2(syst) between 140 GeV and 5.4 TeV. The observations reveal a low-flux state, about 6 times below the 1995 flare seen by Whipple and comparable with the previous Whipple and HEGRA long-term measurements. During the MAGIC observations no significant time variability was observed.
WOS
WOS:000247245800010
Archivio
http://hdl.handle.net/11368/2338310
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-34547311761
Diritti
metadata only access
Soggetti
  • Very High Energy Gamm...

  • Active Galactic Nucle...

  • MAGIC telescope

Visualizzazioni
7
Data di acquisizione
Apr 19, 2024
Vedi dettagli
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