MeerKAT HI commissioning observations of MHONGOOSE galaxy ESO 302-G014

Publication date: 
Main author: 
De Blok W.J.G.
IAA authors: 
Román, J.;Verdes-Montenegro, L.
De Blok W.J.G., Athanassoula E., Bosma A., Combes F., English J., Heald G.H., Kamphuis P., Koribalski B.S., Meurer G.R., Román J., Sardone A., Verdes-Montenegro L., Bigiel F., Brinks E., Chemin L., Fraternali F., Jarrett T., Kleiner D., MacCagni F.M., Pisano D.J., Serra P., Spekkens K., Amram P., Carignan C., Dettmar R.-J., Gibson B.K., Holwerda B.W., Józsa G.I.G., Lucero D.M., Oosterloo T.A., Ramaila A.J.T., Ramatsoku M., Sheth K., Walter F., Wong O.I., Zijlstra A.A., Bloemen S., Groot P.J., Le Poole R., Klein-Wolt M., Körding E.G., McBride V.A., Paterson K., Pieterse D.L.A., Vreeswijk P., Woudt P.A.
Astronomy and Astrophysics
Publication type: 
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. © ESO 2020.
ADS Bibcode: 
Galaxies: clusters: individual: ESO 302-G014; Galaxies: dwarf; Galaxies: ISM; Radio lines: galaxies