Planetary Nebulae in the UWISH2 Galactic Plane survey

摘要

UWISH2 is the first unbiassed imaging survey of v= 1 - 0 S(l) molecular hydrogen emission (A= 2.122 μm) in the northern Galactic Plane. Here we discuss 284 extended emission line objects which we consider to be candidate planetary or pre-planetary nebulae. Some are clearly associated with known PN, but the majority (60%) have no previous detection. We have classified the objects according to morphology and find 53% are bipolar with half of these being new detections. The remaining objects are mostly elliptical/round (35%), fainter than the median sample flux (4.4 × 10~(-17) W m~(-2)) and previously undetected (74%).