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We map for the first time the two-dimensional H_2 excitation of warmintergalactic gas in Stephan's Quintet on group-wide (50 x 35 kpc^2) scales toquantify the temperature, mass and warm-H_2 mass fraction as a function ofposition using Spitzer. Molecular gas temperatures are seen to rise (to T >700K) and the slope of the power--law density-temperature relation flattensalong the main ridge of the filament, defining the region of maximum heating.We also performed MHD modeling of the excitation properties of the warm gas, tomap the velocity structure and energy deposition rate of slow and fastmolecular shocks. Slow magnetic shocks were required to explain the powerradiated from the lowest--lying rotational states of H_2, and strongly supportthe idea that energy cascades down to small scales and low velocities from thefast collision of NGC 7318b with group-wide gas. The highest levels of heatingof the warm H_2 is strongly correlated with the large-scale stirring of themedium as measured by [CII] spectroscopy with Herschel. H_2 is also seenassociated with a separate bridge which extends towards the Seyfert nucleus inNGC 7319, both from Spitzer and CARMA CO observations. This opens up thepossibility that both galaxy collisions and AGN outflows can turbulently heatgas on large-scales in compact groups. The observations provide a laboratoryfor studying the effects of turbulent energy dissipation on group-wide scalesthat may provide clues about the heating and cooling of gas at high-z in earlygalaxy and protogalaxy formation.

astrophysical journal/the astrophysical journal

Powerful H2 Line Cooling in Stephan's Quintet II. Group-wide Gas and  Shock Modeling of the Warm H2 and a Comparison with [CII]157.7um Emission and  Kinematics