Anomalous gas in ESO 149-G003: A MeerKAT-16 View
Gyula I. G. J\'ozsa, Kshitij Thorat, Peter Kamphuis, Lerato, Sebokolodi, Eric K. Maina, Jing Wang, Dani\"elle L. A. Pieterse, Paul Groot,, Athanaseus J. T. Ramaila, Paolo Serra, Lexy A. L. Andati, W. J. G. de Blok,, Benjamin V. Hugo, Dane Kleiner, Filippo M. Maccagni

TL;DR
This study uses MeerKAT and MeerLICHT observations to confirm anomalous and extraplanar neutral hydrogen in the isolated dwarf galaxy ESO 149-G003, revealing ongoing gas accretion processes.
Contribution
First detailed kinematic analysis of anomalous HI in ESO 149-G003 using MeerKAT, confirming extraplanar gas and estimating its mass fraction.
Findings
At least 7-8% of HI exhibits anomalous kinematics.
Less than 1% of HI is extraplanar and morphologically confirmed.
The galaxy is likely acquiring gas through accretion.
Abstract
ESO 149-G003 is a close-by, isolated dwarf irregular galaxy. Previous observations with the ATCA indicated the presence of anomalous neutral hydrogen (HI) deviating from the kinematics of a regularly rotating disc. We conducted follow-up observations with the MeerKAT radio telescope during the 16-dish Early Science programme as well as with the MeerLICHT optical telescope. Our more sensitive radio observations confirm the presence of anomalous gas in ESO 149-G003, and further confirm the formerly tentative detection of an extraplanar HI component in the galaxy. Employing a simple tilted-ring model, in which the kinematics is determined with only four parameters but including morphological asymmetries, we reproduce the galaxy's morphology, which shows a high degree of asymmetry. By comparing our model with the observed HI, we find that in our model we cannot account for a significant…
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