A new technique to isolate kinematically anomalous gas in HI data cubes by Nandrianina Randriamiarinarivo et al. on Thursday 24 November

HI line observations of nearby galaxies often reveal the presence of

extraplanar and/or kinematically anomalous gas that deviates from the general

circular flow. In this work, we study the dependence of kinematically anomalous

HI gas in galaxies taken from the Simba cosmological simulation on galaxy

properties such as HI mass fraction, specific star formation rate, and local

environmental density. To identify kinematically anomalous gas, we use a simple

yet effective decomposition method to separate it from regularly-rotating gas

in the galactic disk; this method is well-suited for application to

observational datasets but has been validated here using the simulation. We

find that at fixed atomic gas mass fraction, the anomalous gas fraction

increases with the specific star formation rate. We also find that the

anomalous gas fraction does not have a significant dependence on a galaxy's

environment. Our decomposition method has the potential to yield useful

insights from future HI surveys.

arXiv: http://arxiv.org/abs/http://arxiv.org/abs/2211.12306v1