A serendipitous discovery of HI-rich galaxy groups with MeerKAT
arXiv:2403.16807 · doi:10.1093/mnras/stae684
Abstract
We report on the serendipitous discovery of 49 HI-rich galaxies in a 2.3 hour Open Time observation with MeerKAT. We present their properties including their HI masses, intensity and velocity maps, and spectra. We determine that at least three HI-rich galaxy groups have been detected, potentially as part of a supergroup. Some members of these galaxy groups show clear interaction with each other in their HI emission. We cross-match the detections with PanSTARRS, WISE and GALEX, and obtain stellar masses and star formation rates. One source is found to be a potential OH megamaser, but further follow-up is required to confidently determine this. For 6 sources with sufficient spatial resolution in HI we produce rotation curves with BBarolo, generate mass models, and derive a dark matter halo mass. While the number of galaxies detected in this relatively short pointing appears to be at the high end of expectations compared to other MeerKAT observations and group HIMF studies, this finding highlights the capability of MeerKAT for other serendipitous discoveries, and the potential for many more HI-rich galaxies to be revealed within both existing and upcoming Open Time datasets.
16 pages, 10 figures. Includes appendix (32 pages, primarily figures). Published in MNRAS
References in corpus (28)
- The Circumgalactic Medium
- High-Resolution Rotation Curves and Galaxy Mass Models from THINGS
- High-resolution mass models of dwarf galaxies from LITTLE THINGS
- The UV-Optical Color Magnitude Diagram II: Physical Properties and Morphological Evolution On and Off of a Star-Forming Sequence
- SoFiA: a flexible source finder for 3D spectral line data
- Cold gas stripping in satellite galaxies: from pairs to clusters
- SoFiA 2 -- An automated, parallel HI source finding pipeline for the WALLABY survey
- Variation of galactic cold gas reservoirs with stellar mass
- MIGHTEE-HI: The HI emission project of the MeerKAT MIGHTEE survey
- Scaling Properties of Galaxy Groups
- LoCuSS: Pre-processing in galaxy groups falling into massive galaxy clusters at z=0.2
- The Large Area Radio Galaxy Evolution Spectroscopic Survey (LARGESS): Survey design, data catalogue and GAMA/WiggleZ spectroscopy
- WALLABY Pilot Survey: Public release of HI data for almost 600 galaxies from phase 1 of ASKAP pilot observations
- The Persistent Percolation of Single-Stream Voids
- First release of Apertif imaging survey data
- A MeerKAT view of pre-processing in the Fornax A group
- WALLABY Early Science - II. The NGC 7232 galaxy group
- DustPedia - the relationships between stars, gas and dust for galaxies residing in different environments
- OH Megamasers in HI Surveys: Forecasts and a Machine Learning Approach to Separating Disks from Mergers
- WALLABY Pre-Pilot Survey: HI Content of the Eridanus Supergroup
- HI absorption in nearby compact radio galaxies
- Evolution of compact groups from intermediate to final stages: A case study of the HI content of HCG 16
- The relation between specific baryon angular momentum and mass for a sample of nearby low-mass galaxies with resolved HI kinematics
- HI debris in the IC 1459 galaxy group
- Apertif view of the OH Megamaser IRAS 10597+5926: OH 18 cm satellite lines in wide-area HI surveys
- WISE data as a photometric redshift indicator for radio AGN
- LADUMA: Discovery of a luminous OH megamaser at
- MIGHTEE-HI: Discovery of an HI-rich galaxy group at z = 0.044 with MeerKAT