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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

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Antoranz Canales, Pedro and Barrio Uña, Juan Abel and Contreras González, José Luis and Fonseca González, Mª Victoria and López Moya, Marcos and Miranda Pantoja, José Miguel (2007) Observation of very high energy gamma-rays from the AGN 1ES 2344+514 in low emission state with the magic telescope. Astrophysical journal, 662 (2 (Par). pp. 892-899. ISSN 0004-637X

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Official URL: http://dx.doi.org/10.1086/518431




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.


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© The American Astronomical Society. We thank the IAC for the excellent working conditions at the Observatorio del Roque de los Muchachos in La Palma. The support of the German BMBF and MPG, the Italian INFN and the Spanish CICYT is gratefully acknowledged. This work was also supported by ETH Research Grant TH 34/04 3 and the Polish MNiI Grant 1P03D01028.

Uncontrolled Keywords:Active Galactic Nuclei, Einstein Slew Survey, BL-Lacertae Objects, Multiwavelength Observations, Cherenkov Telescopes, LAC Objects, Spectra, Discovery, Radiation, Universe.
Subjects:Sciences > Physics > Electronics
Sciences > Physics > Electricity
Sciences > Physics > Nuclear physics
ID Code:23841
Deposited On:09 Dec 2013 09:35
Last Modified:10 Dec 2018 14:58

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