Article Dans Une Revue The Astrophysical Journal Année : 2024

Bird's-eye View of Molecular Gas across Stephan's Quintet Galaxy Group and Intragroup Medium

P N Appleton
W T Reach
P M Ogle
A. Togi
P.-A. Duc
G. Helou

Résumé

We present the large-scale distribution and kinematics of cold molecular gas across the compact galaxy group Stephan's Quintet, based on CO(2-1) observations performed with the Atacama Compact Array (ACA) and CO(1-0) data from the Combined Array for Research in Millimeter-wave Astronomy (CARMA). We find coherent structures of molecular gas associated with the galaxies and intragroup medium, which follow the distribution of warm H 2 previously seen with the James Webb Space Telescope (JWST). CO is associated with a ridge of shocked gas that crosses the galaxy group, and with a spiral arm of the intruding galaxy NGC 7318b, which interacts with the intragroup medium along the ridge. Although the ridge contains widespread shocks, turbulent gas, and warm H 2 , the CO lines are narrower than elsewhere in Stephan's Quintet (FWHM ∼ 25-65 km s -1 ), indicative of settled cold gas. At a distinctly different velocity, CO is found in the active galaxy NGC 7319 and northern star-forming region SQ-A. A bridge of turbulent molecular gas connects NGC 7319 with the ridge, covering a gap of ∼700 km s -1 between these structures. The gas excitation ranges from

L CO 1 0 ¢ -∼ 0.3 in the bridge and SQ-A, to ∼0.5 along the ridge, to near unity in the center of NGC 7319. We also detect either a molecular outflow or turbulent molecular gas associated with the radio source in NGC 7319. These ACA data are part of a program with the Atacama Large Millimeter/submillimeter Array and JWST to study the physics of molecular gas from the largest to the smallest scales across the intragroup medium of Stephan's Quintet.

Unified Astronomy Thesaurus concepts: Hickson compact group (729); Circumgalactic medium (1879); Intergalactic medium (813); Intergalactic filaments (811); Radio galaxies (1343); Interacting galaxies (802); Radio telescopes (1360); Millimeter astronomy (1061); Galaxy groups (597); Galaxy collisions (585); Shocks (2086)

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insu-04877427 , version 1 (09-01-2025)

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B H C Emonts, P N Appleton, U. Lisenfeld, P. Guillard, C K Xu, et al.. Bird's-eye View of Molecular Gas across Stephan's Quintet Galaxy Group and Intragroup Medium. The Astrophysical Journal, 2024, 978 (1), pp.111. ⟨10.3847/1538-4357/ad957c⟩. ⟨insu-04877427⟩
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