EA01A/B : high-resolution HI imaging of an interacting pair of post-starburst (E+A) galaxies
Pieter Buyle, Sven De Rijcke, Herwig Dejonghe

TL;DR
This study uses high-resolution 21cm HI imaging to reveal tidal tails and neutral gas distribution in an interacting pair of post-starburst galaxies, linking gas dynamics to their recent starburst activity.
Contribution
It provides the first high-resolution spatial mapping of neutral hydrogen in the EA01A/B galaxy pair, confirming interaction-driven starburst triggers and gas distribution.
Findings
Detection of three gaseous tidal tails confirming interaction
Presence of 6.6 billion solar masses of neutral gas near the galaxies
Most neutral gas is in tidal arms, not within the galaxies themselves
Abstract
We present high spatial resolution 21cm HI observations of EA01A and EA01B, a pair of interacting post-starburst, or E+A, galaxies at z = 0.0746. Based on optical HST/WFPC2 images, both galaxies are known to display disturbed morphologies. They also appear to be linked by a bridge of stars. Previous HI observations Chang et al. (2001) had already uncovered sizable quantities of neutral gas in or near these galaxies but they lacked the spatial resolution to locate the gas with any precision within this galactic binary system. We have analysed deep, high resolution archival VLA observations of the couple. We find evidence for three gaseous tidal tails; one connected to EA01A and two emanating from EA01B. These findings confirm, independently from the optical imaging, that (i) EA01A and EA01B are actively interacting, and that, as a consequence, the starbursts that occurred in these…
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