Discovery of Very High Energy gamma-rays from 1ES1011+496 at z=0.212 - INSPIRE

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Discovery of Very High Energy gamma-rays from 1ES1011+496 at z=0.212

MAGIC

Collaboration

•

J. Albert
(
- Wurzburg U.
)

Jun, 2007

4 pages

Published in:

Astrophys.J.Lett. 667 (2007) L21-L23

e-Print:

0706.4435 [astro-ph]

DOI:

10.1086/521982

Report number:

MPP-2007-88

Experiments:

MAGIC

View in:

ADS Abstract Service

reference search133 citations

Citations per year

Abstract: (arXiv)

We report on the discovery of Very High Energy (VHE) gamma-ray emission from the BL Lacertae object 1ES1011+496. The observation was triggered by an optical outburst in March 2007 and the source was observed with the MAGIC telescope from March to May 2007. Observing for 18.7 hours we find an excess of 6.2 sigma with an integrated flux above 200GeV of (1.58

\pm0.32)\cdot 10^{-11}

photons cm

^{-2}

s

^{-1}

. The VHE gamma-ray flux is >40% higher than in March-April 2006 (reported elsewhere), indicating that the VHE emission state may be related to the optical emission state. We have also determined the redshift of 1ES1011+496 based on an optical spectrum that reveals the absorption lines of the host galaxy. The redshift of z=0.212 makes 1ES1011+496 the most distant source observed to emit VHE gamma-rays up to date.

gamma ray: cosmic radiation
cosmic radiation: particle source
cosmic radiation: flux
cosmic radiation: energy spectrum
redshift
Cherenkov counter: imaging
experimental results
GAMMA-RAY OBSERVATIONS
BL LAC OBJECTS

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