Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631 - INSPIRE

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Serendipitous discovery of the unidentified extended TeV gamma-ray source HESS J1303-631

H.E.S.S.

Collaboration

•

F. Aharonian

May, 2005

9 pages

Published in:

Astron.Astrophys. 439 (2005) 1013-1021

e-Print:

astro-ph/0505219 [astro-ph]

DOI:

10.1051/0004-6361:20053195

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Abstract: (arXiv)

The serendipitous discovery of an unidentified extended TeVgamma-ray source close to the galactic plane named HESS J1303-631 at a significance of 21 standard deviations is reported. The observations were performed between February and June 2004 with the H.E.S.S. stereoscopic system of Cherenkov telescopes in Namibia. HESS J1303-631 was discovered roughly 0.6 deg north of the binary system PSR B1259-63/SS 2883, the target object of the initial observation campaign which was also detected at TeV energies in the same field of view. HESS J1303-631 is extended with a width of an assumed intrinsic Gaussian emission profile of sigma = (0.16 +- 0.02) deg and the integral flux above 380 GeV is compatible with constant emission over the entire observational period of (17 +- 3)% of the Crab Nebula flux. The measured energy spectrum can be described by a power-law dN/dE ~ E^-Gamma with a photon index of Gamma = 2.44 +- 0.05_stat +- 0.2_syst. Up to now, no counterpart at other wavelengths is identified. Various possible TeV production scenarios are discussed.

Note:

9 pages, 8 figures, accepted in Astronomy and Astrophysics

GAMMA-RAY OBSERVATIONS
GALAXY DISK
photon: cosmic radiation
cosmic radiation: particle source
cosmic radiation: flux
cosmic radiation: energy spectrum
Cherenkov counter: imaging
experimental results

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