A MeerKAT view of the Neutral Atomic Gas in Stephan's Quintet
K. Rajpurohit, E. O'Sullivan, G. Schellenberger, J. M. Vrtilek, L. P. David, S. Giacintucci, P. N. Appleton, C. K. Xu, C. Cheng, T. Deb

TL;DR
This paper presents new MeerKAT 21cm observations revealing detailed neutral hydrogen distribution and kinematics in Stephan's Quintet, including new detections and insights into gas dynamics and interactions.
Contribution
First detailed MeerKAT HI observations of Stephan's Quintet, identifying new features and providing improved understanding of gas distribution and motion in the group.
Findings
Detected HI in member galaxies NGC 7319 and NGC 7320C for the first time.
Identified an additional high-velocity HI component in SQ-A.
Measured a total HI mass of approximately 3.5×10^{10} solar masses.
Abstract
We present new MeerKAT 21cm spectral line observations of the neutral hydrogen gas in the compact galaxy group Stephan's Quintet (HCG 92). These data provide a significantly improved view of the atomic gas distribution and kinematics in the group. New features include the first detections of HI associated with member galaxies NGC 7319 and NGC 7320C, the identification of an additional high-velocity HI component associated with SQ-A, and the detection of additional HI at low velocities filling much of the area of the NGC~7318B disk. We also find HI in the previously detected gas bridge linking NGC 7319 and NGC 7318B, and a new northern bridge linking NGC 7319 to the SQ-A star-formation region. We detect HI with a wide range of velocities along the line of sight through the northern half of the famous shock ridge, including in the 6200-6500 velocity range occupied by…
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