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Using velocity tagging we have detected hydrogen from NGC 5426 falling ontoits interacting partner NGC 5427. Our observations, with the GHaFaS Fabry-Perotspectrometer, produced maps of the two galaxies in Halpha surface brightnessand radial velocity. We found emission with the range of velocities associatedwith NGC 5426 along lines of sight apparently emanating from NGC 5427,superposed on the velocity map of the latter. After excluding instrumentaleffects we assign the anomalous emission to gas pulled from NGC 5426 during itspassage close to NGC 5427. Its distribution, more intense between the arms andjust outside the disk of NGC 5427, and weak, or absent, in the arms, suggeststhat the infalling gas is behind the disk., ionized by Lyman continuum photonsescaping from NGC 5427. Modeling this, we estimate the distances of these gasclouds- behind the plane: a few hundred pc to a few kpc. We also estimate themass of the infalling (ionized plus neutral) gas, finding an infall rate of 10solar masses per year, consistent with the high measured SFR across the disk ofNGC 5427 and with the detected circumnuclear galactic wind.

Detection of infalling hydrogen in transfer between the interacting galaxies NGC 5426 and NGC 5427