TY - JOUR
T1 - Uncovering Extraplanar Gas in UGCA 250 with the Ultra-deep MHONGOOSE Survey
AU - Kurapati, Sushma
AU - Pisano, D. J.
AU - de Blok, W. J. G.
AU - Kamphuis, Peter
AU - Zabel, Nikki
AU - de Villiers, Mikhail
AU - Healy, Julia
AU - Maccagni, Filippo M.
AU - Kleiner, Dane
AU - Adams, Elizabeth A. K.
AU - Amram, Philippe
AU - Athanassoula, E.
AU - Bigiel, Frank
AU - Bosma, Albert
AU - Brinks, Elias
AU - Chemin, Laurent
AU - Combes, Francoise
AU - Dettmar, Ralf-Jürgen
AU - Józsa, Gyula
AU - Koribalski, Baerbel
AU - Marasco, Antonino
AU - Meurer, Gerhardt
AU - Mogotsi, Moses
AU - Mohapatra, Abhisek
AU - Rajohnson, Sambatriniaina H. A.
AU - Schinnerer, Eva
AU - Sorgho, Amidou
AU - Spekkens, Kristine
AU - Verdes-Montenegro, Lourdes
AU - Veronese, Simone
AU - Walter, Fabian
N1 - © 2025 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/
PY - 2025/4/1
Y1 - 2025/4/1
N2 - We use the neutral atomic hydrogen (H i) observations of the edge-on galaxy UGCA 250, taken as part of the MeerKAT H i 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 nine additional detections within the field of view along with UGCA 250, with eight 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 H i mass of about 15 per cent of the total H i 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.
AB - We use the neutral atomic hydrogen (H i) observations of the edge-on galaxy UGCA 250, taken as part of the MeerKAT H i 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 nine additional detections within the field of view along with UGCA 250, with eight 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 H i mass of about 15 per cent of the total H i 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.
KW - astro-ph.GA
KW - galaxies: structure
KW - galaxies: kinematics and dynamics
KW - galaxies: individual
KW - galaxies: haloes
UR - https://www.scopus.com/pages/publications/105000164325
U2 - 10.1093/mnras/staf387
DO - 10.1093/mnras/staf387
M3 - Article
SN - 1745-3925
VL - 538
SP - 1272
EP - 1287
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
IS - 2
M1 - staf387
ER -