Very Large Array HI Imaging of 'H Alpha Dots'
Abstract
"Hα Dots" are compact sources of line emission that were discovered in a narrow-band imaging study of nearby, star-forming galaxies (Kellar et al. 2008, 2012). While located in close angular and velocity proximity to normal star-forming disk galaxies, they are not obviously associated with them. In Allan et al. (2010) we presented preliminary HI spectral line imaging of selected "Hα Dots" obtained with the Karl G. Jansky Very Large Array in the C configuration. Here present preliminary results from subsequent observations of these sources in the D configuration. The increased surface brightness sensitivity of the combined datasets allows us to determine if the Hα Dots are located within the target galaxies’ gas envelopes, within tidal tails, or if they are isolated, extragalactic star-forming objects. We present HI moment maps and compare these to optical broad and narrow-band images of the same fields. JMC is supported by NSF grant AST-1211683.
- Publication:
-
American Astronomical Society Meeting Abstracts #223
- Pub Date:
- January 2014
- Bibcode:
- 2014AAS...22335514A