A new CO(2-1) map of Stephan's Quintet reveals cold molecular gas structures, including a narrow-line shocked ridge and a turbulent bridge spanning a 700 km/s velocity range.
The Observational Status of Stephan's Quintet
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abstract
We present new photometric and spectroscopic data for the galaxies in the compact group known as Stephan's Quintet. We find the strongest evidence for dynamical perturbation in the spiral component NGC7319. Most of the damage was apparently caused by nearby NGC 7320C which passed through the group a few times 10(^8) years ago. NGC7318B is a spiral galaxy that shows evidence consistent with being in the early stages of a collision with the group. NGC7317 and 18A are either elliptical galaxies or the stripped bulges of former spiral components. They show no evidence of past or present merger activity but are embedded in a luminous halo which suggests that they are interacting with the other members of the group. The low redshift galaxy NGC7320 is most likely a late type, dwarf spiral projected along the same line of sight as the interacting quartet.
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Bird's-eye View of Molecular Gas across Stephan's Quintet Galaxy Group and Intra-group Medium
A new CO(2-1) map of Stephan's Quintet reveals cold molecular gas structures, including a narrow-line shocked ridge and a turbulent bridge spanning a 700 km/s velocity range.