Deeper Chandra follow-up of Cygnus TeV source perpetuates mystery

被引：32

作者：

Butt, YM

Drake, J

Benaglia, P

Combi, JA

Dame, T

Miniati, F

Romero, GE

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] Inst Argentino Radioastron, RA-1894 Buenos Aires, DF, Argentina

[3] Natl Univ La Plata, Fac Ciencias Astron & Geofis, RA-1900 La Plata, Argentina

[4] Univ Jaen, Dept Fis, Jaen 23071, Spain

[5] ETH, Dept Phys, CH-8093 Zurich, Switzerland

来源：

ASTROPHYSICAL JOURNAL | 2006年 / 643卷 / 01期

关键词：

acceleration of particles; cosmic rays; gamma rays : observations; ISM : bubbles; open clusters and associations : individual (Cygnus OB2);

D O I：

10.1086/502642

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A 50 ks 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 two may be radio emitters. That the HEGRA source is a composite, having as a counterpart the multiple pointlike X-ray sources we observe, cannot be ruled out. Indeed, the distribution of pointlike X-ray sources appears nonuniform 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 versus less massive stars in this association.

引用

页码：238 / 244

页数：7

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