Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-05-16
Astrophys.J. 590 (2003) L103-L106
Astronomy and Astrophysics
Astrophysics
15 pages, four figures, ApJL (in press)
Scientific paper
10.1086/376854
High resolution VLA observations of the Arches cluster near the Galactic center show evidence of continuum emission at $\lambda$3.6, 6, 20 and 90cm. The continuum emission at $\lambda$90cm is particularly striking because thermal sources generally become optically thick at longer wavelengths and fall off in brightness whereas non-thermal sources increase in brightness. It is argued that the radio emission from this unique source has compact and diffuse components produced by thermal and nonthermal processes, respectively. Compact sources within the cluster arise from stellar winds of mass-losing stars (Lang, Goss & Rodriguez 2001a) whereas diffuse emission is likely to be due to colliding wind shocks of the cluster flow generating relativistic particles due to diffuse shock acceleration. We also discuss the possibility that $\gamma$-ray emission from 3EG J1746--2851, located within 3.3$'$ of the Arches cluster, results from the inverse Compton scattering of the radiation field of the cluster.
Lang Christian
Law Colin Christian
Lazio Joseph T. W.
Nord Michael
Wardle Mark
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