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

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

Periodico
THE ASTROPHYSICAL JOURNAL
Abstract
The 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.
DOI
10.1086/518431
WOS
WOS:000247245800010
Archivio
http://hdl.handle.net/11390/882546
info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-34547311761
Diritti
metadata only access
Web of Science© citazioni
50
Data di acquisizione
Mar 18, 2024
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