The Many Faces of Shocked and Turbulent Gas in Nearby Extragalactic Systems

We will describe two main environments in nearby galaxies in which shocks and turbulence are depositing energy into the interstellar or intergalactic medium on extragalactic scales and suppressing star formation. We firstly describe new SOFIA [CII] observations of several nearby AGN containing radio jets, in which we observe strong dynamical and kinematic heating of gas along the paths of the jets in both the HI, molecular and ionized gas components, especially in NGC 4258 and NGC 7319. The latter jet may be heating gas far into the intergroup medium of Stephan's Quintet. In a second kind of environment, galaxy collisions, we discuss the turbulent intergalactic bridge of the Taffy galaxies (UGC 12914/5), where we present remarkable new high-resolution ALMA CO and VLA radio continuum observations. The observations demonstrate the complexity and variety of phenomena associated with large-scale turbulence in the IGM, including a tangled web of unstable molecular filaments embedded in tubes of radio continuum emission that imply strong magnetic fields and cosmic ray acceleration. The results show how shocks and turbulence can provide negative feedback on large volumes of gas in galaxies, from AGN-driven radio jets, to large-scale high speed "wet" galaxy collisions.