VLA detections of stellar winds arising from the galactic center Arches cluster

Details VLA detections of stellar winds arising from the galactic center Arches cluster VLA detections of stellar winds arising from the galactic center Arches cluster

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..276l&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

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Scientific paper

Several extraordinary clusters of massive stars near the Galactic center have recently been revealed at near-infrared wavelengths. The Arches and Quintuplet clusters each harbor at least 100 OB supergiants and other highly evolved, mass-losing stellar types such as Wolf-Rayet stars. The expanding, ionized winds of these stars should be detectable at radio wavelengths. Here, we present multi-frequency (ranging from 6 cm to 7 mm), high resolution (0''.3 to 3'') VLA observations of a number of sources that show rising spectra (Sν ∝ να), characteristic of radio detections of ionized stellar winds. In addition, the majority of these detections are coincident in position with near-infrared counterparts located in the Arches and Quintuplet clusters, confirming that these detections are likely to be the ionized winds associated with massive stars in these clusters. The large integrated ionizing flux of the clusters can explain the ionization of the two sets unusually-shaped H II regions found in the central 50 pc of the Galaxy. The interaction of individual stellar winds can also produce a powerful stellar wind that might impact on and alter the surrounding interstellar medium. We are also undertaking a VLA study to detect the winds arising from the massive stars which surround the supermassive black hole, SgrA*, and to determine the effects of tidal shearing on the ionized winds in such an extreme environment.

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