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In this paper, we report the peculiar HI morphology of the cluster spiralgalaxy NGC 6145, which has a 150 kpc HI filament on one side that is nearlyparallel to its major axis. This filament is made up of several HI clouds andthe diffuse HI gas between them, with no optical counterparts. We compare itsHI distribution with other one-sided HI distributions in the literature, andfind that the overall HI distribution is very different from the typical tidaland ram-pressure stripped HI shape, and its morphology is inconsistent withbeing a pure accretion event. Only about 30% of the total HI gas is anchored onthe stellar disk, while most of HI gas forms the filament in the west. At aprojected distance of 122 kpc, we find a massive elliptical companion (NGC6146) with extended radio emission, whose axis points to an HI gap in NGC 6145.The velocity of the HI filament shows an overall light-of- sight motion of 80to 180 km/s with respect to NGC 6145. Using the long-slit spectra of NGC 6145along its major stellar axis, we find that some outer regions show enhancedstar formation, while in contrast, almost no star formation activities arefound in its center (less than 2 kpc). Pure accretion, tidal or ram-pressurestripping is not likely to produce the observed HI filament. An alternativeexplanation is the jet-stripping from NGC 6146, although direct evidence for ajet-cold gas interaction has not been found.

The peculiar filamentary HI structure of NGC 6145