VLA images of the Sickle and Pistol H II regions near the Galactic center at 3.6 and 6 cm reveal six point sources in the region where the dense Quintuplet stellar cluster is located. The spectral indices of five of these sources between 6 cm and 3.6 cm have values of α = +0.5 to +0.8, (where S ∝ ν ), consistent with the interpretation that the radio sources correspond to ionized stellar winds of the massive stars in this cluster. The radio source associated with the Pistol Star shows α = −0.4±0.2, consistent with a flat or slightly non-thermal spectrum. (Refer to PDF file for exact formulas).

Publication Date



Also archived in: arXiv:astro-ph/9907176 v1 13 Jul 1999 We would like to thank Luis Rodriguez for suggesting that the stellar wind of the Pistol Star may be detectable at 8.3 GHz. We would also like to thank Liese van Zee for help with the coordinate solution for the HST/NICMOS image, and Paco Najarro for useful comments on the theory of stellar winds.ISSN:1538-3881 Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works in February 2014.

Document Type


Department, Program, or Center

School of Physics and Astronomy (COS)


RIT – Main Campus