Initial results from the Arecibo Galaxy Environment Survey in the Pegasus Cluster
Abstract
As part of the Arecibo Galaxy Environment Survey (AGES), we have covered a 5deg x 4deg region centered on the Pegasus Cluster and its principal member, the elliptical galaxy NGC 7619, in the 21-cm line of neutral hydrogen. The survey takes in the full redshift range of the cluster and the volume behind it out to 18,000 km/s. In the cluster and the volume we detect over 500 sources, many of which are previously uncataloged. These include five sources without obvious optical counterparts (three within the redshift range of the cluster, which are assumed to be members); of these, four (two within the cluster) have possible low surface-brightness counterparts identified on stacked and/or smoothed SDSS images, while the third remains without an optical counterpart. We also detect three low surface-brightness ultra-diffuse galaxies from the catalog of Shi et al. (2017) in HI for the first time, and find fourteen other HI sources where both a UDG and other potential counterparts are present in the beam, making an unambiguous association with the UDG not possible on the basis of this data alone. In addition to these, we detect N objects with HI and stellar streams.
- Publication:
-
American Astronomical Society Meeting Abstracts #231
- Pub Date:
- January 2018
- Bibcode:
- 2018AAS...23115106M