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We present the first high-resolution map of the cold molecular gasdistribution, as traced by CO(2-1) emission with ALMA, in a prominent rampressure stripped tail. The Norma cluster galaxy ESO 137-001 is undergoing astrong interaction with the surrounding intra-cluster medium and is one of thenearest jellyfish galaxies with a long multi-phase tail. We have mapped thefull extent of the tail at 1" (350 pc) angular resolution and found a richdistribution of mostly compact CO regions extending to nearly 60 kpc in lengthand 25 kpc in width. In total about 10^9 M_sun of molecular gas was detected.The CO features are found predominantly at the heads of numerous small-scale (~1.5 kpc) fireballs (i.e., star-forming clouds with linear streams of youngstars extending toward the galaxy) but also of large-scale (~ 8 kpc)super-fireballs, and double-sided fireballs that have additional diffuseionized gas tails extending in the direction opposite to the stellar tails. Thenew data help to shed light on the origin of the molecular tail - CO filamentsoriented in the direction of the tail with only diffuse associated Halphaemission are likely young molecular features formed in situ, whereas otherlarge CO features tilted with respect to the tail may have originated from thedensest gas complexes that were pushed gradually away from the disk. The ALMAobservations of ESO 137-001, together with observations from HST, Chandra andVLT/MUSE, offer the most complete view of a spectacular ram pressure strippedtail to date.

ALMA unveils widespread molecular gas clumps in the ram pressure stripped tail of the Norma jellyfish galaxy