1 research outputs found
Observation of very high energy gamma-rays from the AGN 1ES 2344+514 in a low emission state with the MAGIC telescope
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))*10^-11 cm^-2 s^-1 above
200 GeV has been obtained from 23.1 hours 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 six 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 has been observed.Comment: 7 pages, 7 figures, ApJ in press; updated fig. 4, fig. 7, tab. 3,
removed typo in differential spectr