On the Neutral Gas Content and Environment of NGC 3109 and the Antlia Dwarf Galaxy

Abstract

As part of a continuing survey of nearby galaxies, we have mapped the neutral gas content of the low surface brightness, Magellanic-type galaxy NGC 3109 --- and its environment, including the Antlia dwarf galaxy --- at unprecedented velocity resolution and brightness sensitivity. The HI mass of NGC 3109 is measured to be (3.8 +/- 0.5) x 10^8 Msun. A substantial warp in the disk of NGC 3109 is detected in the HI emission image in the form of an extended low surface brightness feature. We report a positive detection in HI of the nearby Antlia dwarf galaxy, and measure its total neutral gas mass to be (6.8 +/- 1.4) x 10^5 Msun. We show the warp in NGC 3109 to lie at exactly the same radial velocity as the gas in the Antlia dwarf galaxy and speculate that Antlia disturbed the disk of NGC 3109 during a mild encounter ~1 Gyr in the past. HI data for a further eight galaxies detected in the background are presented.

Accepted for publication in AJ

Cited by in corpus (33)

• The 1000 Brightest HIPASS Galaxies: HI Properties
• The Progenitors of Dwarf Spheroidal Galaxies
• The Effects of Photoionization on Galaxy Formation - II: Satellites in the Local Group
• Is there Evidence for Flat Cores in the Halos of Dwarf Galaxies?: The Case of NGC 3109 and NGC 6822
• VLA-ANGST: A high-resolution HI Survey of Nearby Dwarf Galaxies
• Nebular Abundances of Nearby Southern Dwarf Galaxies
• The extent of NGC 6822 revealed by its C stars population
• What Causes The Formation of Disks and End of Bursty Star Formation?
• Southern GEMS groups II: HI distribution, mass functions and HI deficient galaxies
• The ARAUCARIA Project: VLT-FORS spectroscopy of blue supergiants in NGC 3109 - Classifications, first abundances and kinematics
• Hot Dust and PAH Emission at Low Metallicity: A Spitzer Survey of Local Group and Other Nearby Dwarf Galaxies
• Galaxy Mass Models: MOND versus Dark Matter Halos
• The chemical composition of planetary nebulae and HII regions in NGC 3109
• The extended structure of the dwarf irregular galaxies Sextans A and Sextans B. Signatures of tidal distortion in the outskirts of the Local Group
• KAT-7 Science Verification: Using HI Observations of NGC 3109 to Understand its Kinematics and Mass Distribution
• Neutral Hydrogen Clouds near Early-Type Dwarf Galaxies of the Local Group
• A Plane of High Velocity Galaxies Across the Local Group
• Carbon star survey in the Local Group. VII. NGC 3109 a galaxy without a stellar halo
• Galaxy Pairs in the Local Group
• Interstellar Medium Oxygen Abundances of Dwarf Irregular Galaxies in Centaurus A and Nearby Groups
• SDSS Survey for Resolved Milky Way Satellite Galaxies II: High-Velocity Clouds in the Early Data Release
• The Turn-Down of the Baryonic Tully-Fisher Relation and Changing Baryon Fractions at Low Galaxy Masses
• Tidal interactions at the edge of the Local Group: New evidence for tidal features in the Antlia Dwarf Galaxy
• Dynamical History Of The Local Group In $\Lambda$CDM $\mathrm{II}$ $-$ Including External Perturbers In 3D
• The Discovery of New Galaxy Members in the NGC 5044 and NGC 1052 Groups
• VLA and ATCA Search for Natal Star Clusters in Nearby Star-Forming Galaxies
• Impact of UV Radiation from Giant Spirals on the Evolution of Dwarf Galaxies
• A census of dwarf galaxy satellites around LMC-mass galaxy NGC 2403
• Census of Gaseous Satellites around Local Spiral Galaxies
• Seeing Red in NGC 1978, NGC 55, and NGC 3109
• Antlia Dwarf Galaxy: Distance, quantitative morphology and recent formation history via statistical field correction
• The emergence of globular clusters and globular-cluster-like dwarfs
• Optical BVI Imaging and HI Synthesis Observations of the Dwarf Irregular Galaxy ESO 364-G 029