Uncovering extraplanar gas in UGCA 250 with the Ultra-deep MHONGOOSE Survey

ABSTRACT 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 $\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 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.

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Journal
Monthly Notices of the Royal Astronomical Society
Published
2025-03-06
DOI
https://doi.org/10.1093/mnras/staf387
Primary Topic
Astronomy and Astrophysical Research
Type
article
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article

Uncovering extraplanar gas in UGCA 250 with the Ultra-deep MHONGOOSE Survey

R.‐J. Dettmar, D. Kleiner, L. Chemin, Fabian Walter et al.
Monthly Notices of the Royal Astronomical Society
Astronomy and Astrophysical Research
article

Uncovering extraplanar gas in UGCA 250 with the Ultra-deep MHONGOOSE Survey

R.‐J. Dettmar, D. Kleiner, L. Chemin, Fabian Walter, Sushma Kurapati, P. Kamphuis, Moses Mogotsi, F. M. Maccagni, Antonino Marasco, Frank Bigiel, D. J. Pisano, L. Verdes‐Montenegro, Elizabeth A. K. Adams, A. Sorgho, Eva Schinnerer, Kristine Spekkens, W. J. G. de Blok, A. Bosma, Abhisek Mohapatra, E. Athanassoula, E. Brinks, Françoise Combes, G. I. G. Józsa, Sambatriniaina H A Rajohnson, G. R. Meurer, J. Healy, Marietjie de Villiers, Nikki Zabel, S. Veronese, B. Koribalski, Philippe Amram
article en

Abstract

ABSTRACT 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 $\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 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.

Monthly Notices of the Royal Astronomical SocietyVol. 538(2)
Commonwealth Scientific and Industrial Research Organisation (AU), Centre National de la Recherche Scientifique (FR), Australia Telescope National Facility (AU), Engineering and Physical Sciences Research Council (GB), University of Hertfordshire (GB), University of Cape Town (ZA), University of Groningen (NL), The University of Western Australia (AU), Rhodes University (ZA), Queen's University (CA), Aix-Marseille Université (FR), Université Paris Sciences et Lettres (FR), Observatoire de Paris (FR), Observatoire astronomique de Strasbourg (FR), University of Manchester (GB), Sorbonne Université (FR), Clínica Las Condes (CL), AstroTec Holding (Netherlands) (NL), Max Planck Institute for Astronomy (DE), South African Radio Astronomy Observatory (ZA), Astronomical Institute of the Slovak Academy of Sciences (SK), Osservatorio Astronomico di Cagliari (IT), Max Planck Institute for Radio Astronomy (DE), Instituto de Astrofísica de Andalucía (ES), Osservatorio Astronomico di Padova (IT), International Centre for Radio Astronomy Research (AU), Royal Military College of Canada (CA), Western Sydney University (AU), Ruhr University Bochum (DE), Netherlands Institute for Radio Astronomy (NL)
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