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We present the discovery of a new H I structure in the NGC 7194 group fromthe observations using the Karl G. Jansky Very Large Array. NGC 7194 group is anearby (z ~ 0.027) small galaxy group with five quiescent members. Theobservations reveal a 200 kpc-long H I plume that spans the entire group with atotal mass of M$_{HI}$ = 3.4 x 10$^{10}$ M$_{\odot}$. The line-of-sightvelocity of the H I gas gradually increases from south (7200 km s$^{-1}$) tonorth (8200 km $^{-1}$), and the local velocity dispersion is up to 70 kms$^{-1}$. The structure is not spatially coincident with any member galaxiesbut it shows close associations with a number of blue star-forming knots.Intragroup H I gas is not rare, but this particular structure is still one ofthe unusual cases in the sense that it does not show any clear connection withsizable galaxies in the group. We discuss the potential origins of thislarge-scale H I gas in the NGC 7194 group and its relation with theintergalactic star-forming knots. We propose that this HI feature could haveoriginated from tidal interactions among group members or the infall of alate-type galaxy into the group. Alternatively, it might be leftover gas fromflyby intruders.

Discovery of a large-scale H I plume in the NGC 7194 Group