xGASS: Robust quantification of asymmetries in global HI spectra and their relationship to environmental processes

13 Jan 2020 Watts Adam B. Catinella Barbara Cortese Luca Power Chris

We present an analysis of asymmetries in global HI spectra from the extended GALEX Arecibo SDSS Survey (xGASS), a stellar mass-selected and gas fraction-limited survey which is representative of the HI properties of galaxies in the local Universe. We demonstrate that the asymmetry in a HI spectrum is strongly linked to its signal-to-noise meaning that, contrary to what was done in previous works, asymmetry distributions for different samples cannot be compared at face value... (read more)

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  • ASTROPHYSICS OF GALAXIES