Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-09-07
Astrophys.J.643:238-244,2006
Astronomy and Astrophysics
Astrophysics
Substantially revised version; incorporates referee suggestions & expanded discussion
Scientific paper
10.1086/502642
A 50 ksec Chandra observation of the unidentified TeV source in Cygnus reported by the HEGRA collaboration reveals no obvious diffuse X-ray counterpart. However, 240 Pointlike X-ray sources are detected within or nearby the extended TeV J2032+4130 source region, of which at least 36 are massive stars and 2 may be radio emitters. That the HEGRA source is a composite, having as counterpart the multiple point-like X-ray sources we observe, cannot be ruled out. Indeed, the distribution of point-like X-ray sources appears non-uniform and concentrated broadly within the extent of the TeV source region. We offer a hypothesis for the origin of the very high energy gamma-ray emission in Cyg OB2 based on the local acceleration of TeV range cosmic rays and the differential distribution of OB vs. less massive stars in this association.
Benaglia Paula
Butt Yousaf
Combi Jorge
Dame Thomas
Drake Jeremy
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