Uncovering Extraplanar Gas in UGCA 250 with the Ultra-deep MHONGOOSE Survey
arXiv:2503.03483 · doi:10.1093/mnras/staf387
Abstract
We use the neutral atomic hydrogen (HI) observations of the edge-on galaxy UGCA 250, taken as part of the MeerKAT HI Observations of Nearby Galactic Objects - Observing Southern Emitters (MHONGOOSE) survey to investigate the amount, morphology, and kinematics of extraplanar gas. The combination of high column density sensitivity and high spatial resolution of the survey over a large field of view is ideal for studying the underlying physics governing the extraplanar gas. These data reveal 9 additional detections within the field of view along with UGCA 250, with 8 of them being within 200 km s of the galaxy's systemic velocity. The galaxy seems to have a tail-like feature extending away from it in the southern direction up to 41 kpc (in projection). We also detect a cloud at anomalous velocities, but we did not find any optical counterpart. We construct a detailed tilted ring model for this edge-on galaxy to gain a deeper understanding of the vertical structure of its neutral hydrogen. The model that best matches the data features a thick disc with a scale height of 31 kpc and an HI mass of about 15 of the total HI mass. This extraplanar gas is detected for the first time in UGCA 250. Our analysis favours a mixed origin for the extraplanar gas in UGCA 250, likely arising from a combination of internal stellar feedback and external tidal interactions.
16 pages, 14 figures, Accepted for publication in MNRAS
References in corpus (22)
- Cold gas accretion in galaxies
- The cold gaseous halo of NGC 891
- A z=0 Multi-wavelength Galaxy Synthesis I: A WISE and GALEX Atlas of Local Galaxies
- Accretion of gas onto nearby spiral galaxies
- Galaxy Groups within 3500 km s
- Star formation sustained by gas accretion
- HI holes and high-velocity clouds in the spiral galaxy NGC 6946
- Kinematic modelling of disk galaxies I. A new method to fit tilted rings to data cubes
- SoFiA 2 -- An automated, parallel HI source finding pipeline for the WALLABY survey
- Hydrodynamical simulations of Galactic fountains I: evolution of single fountains
- How Gas Accretion Feeds Galactic Disks
- MHONGOOSE -- A MeerKAT Nearby Galaxy HI Survey
- Anomalous HI in NGC 2997
- Cosmicflows-4: The Baryonic Tully-Fisher Relation Providing ~10,000 Distances
- Vertically Extended Neutral Gas in the Massive Edge-on Spiral NGC 5746
- Fountain-driven gas accretion feeding star formation over the disc of NGC 2403
- Canvas and Cosmos: Visual Art Techniques Applied to Astronomy Data
- MHONGOOSE discovery of a gas-rich low-surface brightness galaxy in the Dorado Group
- Possible origins of anomalous HI gas around MHONGOOSE galaxy, NGC 5068
- Extended neutral hydrogen filamentary network in NGC 2403
- Cosmological gas accretion history onto the stellar discs of Milky Way-like galaxies in the Auriga simulations -- (I) Temporal dependency
- The Cosmological Context of Extraplanar Gas