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| Paper: |
Radio Cores of Bipolar Nebulae: Search for Collimated Winds |
| Volume: |
313, Asymmetrical Planetary Nebulae III |
| Page: |
194 |
| Authors: |
Lee, T.-H.; Lim, J.; Kwok, S. |
| Abstract: |
We present results of our search for collimated ionized winds in bipolar nebulae using the Very Large Array (VLA) and the Australia Telescope Compact Array (ATCA). Our search is motivated by the discovery of an ionized jet in the bipolar nebula M 2-9 (Lim & Kwok 2003) that is proposed to be responsible for producing the nebula's mirror-symmetric structure. To determine if central ionized jets are a common feature of bipolar nebulae, we searched for the signatures of ionized jets -- optically thick cores -- in 11 northern nebulae with the VLA at 1.3 cm and 0.7 cm, and in 5 southern nebulae with the ATCA at 6 cm and 3.6 cm. Two northern objects, 19W32 and M 1-91, exhibit a compact radio core with a rising spectrum. Three southern objects, He 2-84, Th 2-B and Mz 3, also show a compact radio core. Of these five objects, only Mz 3 exhibits extended two-lobe nebular radio emission. Here we present a preliminary analysis of these five radio cores and discuss the implications of our results. |
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