Journal
ASTRONOMY & ASTROPHYSICS
Volume 431, Issue 1, Pages 197-202Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20041552
Keywords
gamma rays : observations; stars : early-type; open clusters and associations : individual : Cygnus OB2
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The unidentified TeV source in Cygnus is now confirmed by follow-up observations from 2002 with the HEGRA stereoscopic system of Cherenkov Telescopes. Using all data ( 1999 to 2002) we confirm this new source as steady in flux over the four years of data taking, extended with radius 6.2' (+/-1.2(stat)' +/- 0.9(sys)') and exhibiting a hard spectrum with photon index -1.9. It is located in the direction of the dense OB stellar association, Cygnus OB2. Its integral flux above energies E > 1 TeV amounts to similar to5% of the Crab assuming a Gaussian profile for the intrinsic source morphology. There is no obvious counterpart at radio, optical nor X-ray energies, leaving TeV J2032+4130 presently unidentified. Observational parameters of this source are updated here and some astrophysical discussion is provided. Also included are upper limits for a number of other interesting sources in the FoV, including the famous microquasar Cygnus X-3.
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