Undetected Matter in Nascent Groups in the RESOLVE Survey
Abstract
We analyze the baryonic and dark matter content of three small galaxy groups in the REsolved Spectroscopy Of a Local VolumE (RESOLVE) survey, each with four known members. Our three "nascent groups" represent different stages of evolution with group integrated gas-to-stellar mass ratios ranging from 0.3 to 2.9. Analyzing the profiles of the mass components for individual galaxies can illuminate the distribution of undetected gas and dark matter for the group. We use stellar mass profiles based on UV-Optical-IR photometry, atomic gas mass profiles based on VLA 21-cm data, and molecular gas mass profiles based on ALMA CO data. We analyze spectroscopic data from the SALT and SOAR telescopes to obtain H-alpha rotation curves and total mass profiles. We perform mass decomposition to quantify the undetected matter in individual galaxies, which we use to assemble the mass inventory of their host group. This analysis enables us to investigate the behavior of undetected mass components as galaxy groups evolve. This research has been supported by National Science Foundation grant AST-1814486.
- Publication:
-
American Astronomical Society Meeting Abstracts #235
- Pub Date:
- January 2020
- Bibcode:
- 2020AAS...23520728E