FEASTS: The Fate of Gas and Star Formation in Interacting Galaxies
Shun Wang, Jing Wang, Karen Lee-Waddell, Dong Yang, Xuchen Lin, Lister, Staveley-Smith

TL;DR
This study uses HI data from FEASTS to analyze how galaxy interactions affect gas distribution and star formation, revealing increased HI disorder and complex gas dynamics in interacting systems.
Contribution
It introduces a detailed parameterization of HI disorder in interacting galaxies and links these parameters to gas and star formation properties, providing new insights into interaction effects.
Findings
Interacting galaxies show higher HI disorder across most parameters.
Secondary galaxies with similar mass and low velocity have more HI expansion and clumpiness.
Gas deficiency correlates with HI piling at system edges, affecting star formation.
Abstract
We use HI data from the FAST Extended Atlas of Selected Targets Survey (FEASTS) to study the interplay between gas and star formation of galaxies in interacting systems. We build control and mock HI disks and parameterize HI disorder by a series of disorder parameters, describing the piling, clumpiness and expansion of HI. We find that interacting galaxies have higher HI disorder described by almost all disorder parameters. Systems with comparable stellar masses and small relative velocities tend to have stronger expansion and clumpiness of HI. At a given stellar mass, decreased HI and total neutral gas mass and suppressed star formation rate of secondary galaxies are correlated with most disorder parameters. For primary galaxies, HI and total neutral gas deficiency correlate with more HI piling at two ends of the system outside HI disks but not with the expansion or clumpiness of HI.…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Astrophysics and Star Formation Studies
