MeerKAT HI commissioning observations of MHONGOOSE galaxy ESO 302-G014

W. J. G. de Blok*, E. Athanassoula, A. Bosma, F. Combes, J. English, G. H. Heald, P. Kamphuis, B. S. Koribalski, G. R. Meurer, J. Román, A. Sardone, L. Verdes-Montenegro, F. Bigiel, E. Brinks, L. Chemin, F. Fraternali, T. Jarrett, D. Kleiner, F. M. Maccagni, D. J. PisanoP. Serra, K. Spekkens, P. Amram, C. Carignan, R. -J. Dettmar, B. K. Gibson, B. W. Holwerda, G. I. G. Józsa, D. M. Lucero, T. A. Oosterloo, A. J. T. Ramaila, M. Ramatsoku, K. Sheth, F. Walter, O. I. Wong, A. A. Zijlstra, S. Bloemen, P. J. Groot, R. Le Poole, M. Klein-Wolt, E. G. Körding, V. A. McBride, K. Paterson, D. L. A. Pieterse, P. Vreeswijk, P. A. Woudt

*Bijbehorende auteur voor dit werk

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Aims: We present the results of three commissioning H I observations obtained with the MeerKAT radio telescope. These observations make up part of the preparation for the forthcoming MHONGOOSE nearby galaxy survey, which is a MeerKAT large survey project that will study the accretion of gas in galaxies and the link between gas and star formation.
Methods: We used the available H I data sets, along with ancillary data at other wavelengths, to study the morphology of the MHONGOOSE sample galaxy, ESO 302-G014, which is a nearby gas-rich dwarf galaxy.
Results: We find that ESO 302-G014 has a lopsided, asymmetric outer disc with a low column density. In addition, we find a tail or filament of H I clouds extending away from the galaxy, as well as an isolated H I cloud some 20 kpc to the south of the galaxy. We suggest that these features indicate a minor interaction with a low-mass galaxy. Optical imaging shows a possible dwarf galaxy near the tail, but based on the current data, we cannot confirm any association with ESO 302-G014. Nonetheless, an interaction scenario with some kind of low-mass companion is still supported by the presence of a significant amount of molecular gas, which is almost equal to the stellar mass, and a number of prominent stellar clusters, which suggest recently triggered star formation.
Conclusions: These data show that MeerKAT produces exquisite imaging data. The forthcoming full-depth survey observations of ESO 302-G014 and other sample galaxies will, therefore, offer insights into the fate of neutral gas as it moves from the intergalactic medium onto galaxies.
Originele taal-2English
ArtikelnummerA147
Aantal pagina's16
TijdschriftAstronomy and astrophysics
Volume643
DOI's
StatusPublished - 1-nov-2020

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