Accurate OH maser positions from the SPLASH pilot region
MetadataShow full item record
Copyright © 2016 The American Astronomical Society. All rights reserved.
We report on high spatial resolution observations, using the Australia Telescope Compact Array (ATCA), of ground-state OH masers. These observations were carried out toward 196 pointing centers previously identified in the Southern Parkes Large-Area Survey in Hydroxyl (SPLASH) pilot region, between Galactic longitudes of 334 and 344 and Galactic latitudes of -2 and +2. Supplementing our data with data from the MAGMO (Mapping the Galactic Magnetic field through OH masers) survey, we find maser emission toward 175 of the 196 target fields. We conclude that about half of the 21 nondetections were due to intrinsic variability. Due to the superior sensitivity of the followup ATCA observations, and the ability to resolve nearby sources into separate sites, we have identified 215 OH maser sites toward the 175 fields with detections. Among these 215 OH maser sites, 111 are new detections. After comparing the positions of these 215 maser sites to the literature, we identify 122 (57%) sites associated with evolved stars (one of which is a planetary nebula), 64 (30%) with star formation, two sites with supernova remnants, and 27 (13%) of unknown origin. The infrared colors of evolved star sites with symmetric maser profiles tend to be redder than those of evolved star sites with asymmetric maser profiles, which may indicate that symmetric sources are generally at an earlier evolutionary stage. © 2016. The American Astronomical Society. All rights reserved.
Showing items related by title, author, creator and subject.
Walsh, Andrew; Purcell, C.; Longmore, S.; Breen, S.; Green, A.; Harvey-Smith, L.; Jordan, C.; Macpherson, C. (2014)We report on high spatial resolution water maser observations, using the Australia Telescope Compact Array, towards water maser sites previously identified in the H2O southern Galactic Plane Survey (HOPS). Of the 540 ...
High-mass star-forming cloud G0.38+0.04 in the Galactic center dust ridge contains H2CO and SiO masersGinsburg, A.; Walsh, Andrew; Henkel, C.; Jones, P.; Cunningham, M.; Kauffmann, J.; Pillai, T.; Mills, E.; Ott, J.; Kruijssen, J.; Menten, K.; Batersby, C.; Rathborne, J.; Contreras, Y.; Longmore, S.; Walker, D.; Dawson, J.; Lopez, J. (2015)We have discovered a new H2CO (formaldehyde) 11,0−11,1 4.82966 GHz maser in Galactic center Cloud C, G0.38+0.04. At the time of acceptance, this is the eighth region to contain an H2CO maser detected in the Galaxy. Cloud ...
Qiao, H.; Walsh, Andrew; Shen, Z.; Dawson, J. (2016)Ground-state OH masers identified in the Southern Parkes Large-Area Survey in Hydroxyl were observed with the Australia Telescope Compact Array to obtain positions with high accuracy (~1 arcsec). We classified these OH ...