Abstract We report results of the H2CO and H110α survey toward 281 UCHII regions using the Urumqi 25m radio telescope. We obtained 37 new H2CO detections, and H110α was simultaneously detected in eight of them. Only H110α was detected in another UCHII region. We calculated kinematic distances of nine UCHII regions with the detected H110α and resolved the kinematic distance ambiguity for six of them. The detection rate of H2CO of our observation was 13.2%, which is low compared with one of the other authors. The possible reason is that the sensitivity of our telescope is relatively low.
Keywords ISM: HII regions — ISM: molecules — radio lines: ISM
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