Two long HI tails in the outskirts of Abell 1367
T. C. Scott, L. Cortese, E. Brinks, H. Bravo-Alfaro, R. Auld, and R., Minchin

TL;DR
This study reveals two exceptionally long HI tails in galaxy groups near Abell 1367, challenging existing theories on their formation and highlighting gaps in understanding environmental effects in galaxy groups.
Contribution
The paper presents high-resolution VLA observations uncovering the longest HI tails in galaxy groups, questioning current models of tail formation and environmental interactions.
Findings
Two HI tails extend 160 and 250 kpc, among the longest observed.
RSCG42's tail likely formed by low-velocity tidal interaction.
FGC1287's tail origin remains uncertain, possibly from high-speed interaction.
Abstract
We present VLA D-array HI observations of the RSCG42 and FGC1287 galaxy groups, in the outskirts of the Abell 1367 cluster. These groups are projected ~ 1.8 and 2.7 Mpc west from the cluster centre. The Arecibo Galaxy Environment survey provided evidence for HI extending over as much as 200kpc in both groups. Our new, higher resolution observations reveal that the complex HI features detected by Arecibo are in reality two extraordinary long HI tails extending for ~160 and 250 kpc, respectively, i.e., among the longest HI structures ever observed in groups of galaxies. Although in the case of RSCG42 the morphology and dynamics of the HI tail, as well as the optical properties of the group members, support a low-velocity tidal interaction scenario, less clear is the origin of the unique features associated with FGC1287. This galaxy displays an exceptionally long 'dog leg' HI tail and the…
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