Radio Recombination Line and Continuum Emission from Flickering UC HII Regions in Sgr B2 Main
Abstract
We have observed the Galactic Center star forming regions Sgr B2 Main and North at 1.3 cm and 7 mm with the VLA over a 23 year time baseline. The 1.3 cm observations, at a resolution of ~0.25", indicate that 4 of the 41 ultracompact sources in Sgr B2 Main and North have experienced significant changes in flux density between 1989 and 2012, with three sources brightening (F10.303, F1 and F3) and one source fading (K3). We present a summary of these results, as well as new 7 mm continuum images of Sgr B2 Main and North. Finally, we present the first high spectral resolution radio recombination line (RRL) observations of the sources with detected flux density changes.
- Publication:
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American Astronomical Society Meeting Abstracts #224
- Pub Date:
- June 2014
- Bibcode:
- 2014AAS...22422306D