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).
PY - 2025/3/6
Y1 - 2025/3/6
N2 - 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 $\sim$ 200 km s$^{-1}$ 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 $\sim$ 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 $\sim$ 3$\pm$1 kpc and an HI mass of about 15$\%$ 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.
AB - 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 $\sim$ 200 km s$^{-1}$ 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 $\sim$ 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 $\sim$ 3$\pm$1 kpc and an HI mass of about 15$\%$ 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.
KW - astro-ph.GA
U2 - 10.1093/mnras/staf387
DO - 10.1093/mnras/staf387
M3 - Article
SN - 1745-3925
JO - Monthly Notices of the Royal Astronomical Society: Letters
JF - Monthly Notices of the Royal Astronomical Society: Letters
M1 - staf387
ER -