Radio emission on subparsec scales from the intermediate-mass black hole in NGC 4395

The Seyfert 1 nucleus of NGC 4395 is energized by a black hole of mass 3.6 x 10(5) M-circle dot, making it one of only two nuclear black holes of intermediate mass, 10(3) - 10(6) M-circle dot, detected in the radio regime. Building on UV and X-ray evidence for outflows from this Seyfert nucleus, the VLBI High Sensitivity Array was used at 1.4 GHz to search for extended structure on scales greater than 5 mas (0.1 pc). Elongated emission was discovered, extending over 15 mas (0.3 pc) and suggesting an outflow on subparsec scales from this intermediate-mass black hole. The Seyfert nucleus is located at the center of an elliptical star cluster, and the elongation position angle of the subparsec radio structure is only 19 degrees from the star cluster's minor axis.