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Galaxies in Hickson Compact Group 91 (HCG 91) were observed with the WiFeSintegral field spectrograph as part of our ongoing campaign targeting theionized gas physics and kinematics inside star forming members of compactgroups. Here, we report the discovery of HII regions with abundance andkinematic offsets in the otherwise unremarkable star forming spiral HCG 91c.The optical emission line analysis of this galaxy reveals that at least threeHII regions harbor an oxygen abundance ~0.15 dex lower than expected from theirimmediate surroundings and from the abundance gradient present in the innerregions of HCG 91c. The same star forming regions are also associated with asmall kinematic offset in the form of a lag of 5-10 km/s with respect to thelocal circular rotation of the gas. HI observations of HCG 91 from the VeryLarge Array and broadband optical images from Pan-STARRS suggest that HCG 91cis caught early in its interaction with the other members of HCG 91. We discussdifferent scenarios to explain the origin of the peculiar star forming regionsdetected with WiFeS, and show that evidence point towards infalling andcollapsing extra-planar gas clouds at the disk-halo interface, possibly as aconsequence of long-range gravitational perturbations of HCG 91c from the othergroup members. As such, HCG 91c provides evidence that some of theperturbations possibly associated with the early phase of galaxy evolution incompact groups impact the star forming disk locally, and on sub-kpc scales.

Galaxy Interactions in Compact Groups II: abundance and kinematic anomalies in HCG 91c