A cluster of radio sources near GGD 14

Abstract

We present sensitive Very Large Array (VLA) radio continuum observations at 3.6 cm toward the star-forming region GGD 14 (also known as GGD 12/13/14/15, G213.88-11.84, and AFGL 890). In addition to the previously known cometary H II region, we report the detection of a cluster of six compact radio sources, all with a nearby 2 km counterpart. These new sources appear to be ultracompact H II regions ionized by B2ÈB3 zero-age main-sequence (ZAMS) stars. The kinematic age of these six compact radio sources, assuming expansion at 10 km s~1, is less than 25 yr, and we conclude that they must be conÐned by some mechanism. The sources are so compact that they could be gravitationally bound to the star. One of the new detections, the source VLA 7, is located near the center of the CO molecular outÑow. We suggest that VLA 7 is associated with the powering source of the molecular outÑow and that the infrared sources IRS 9M and IRS 9E, between which lies VLA 7, could be the lobes of a bipolar reÑection nebula tracing the outÑow at small scales.