Optically Thick Radio Cores of Narrow-Waist Bipolar Nebulae

Details Optically Thick Radio Cores of Narrow-Waist Bipolar Nebulae Optically Thick Radio Cores of Narrow-Waist Bipolar Nebulae

2007-05-03

arxiv.org/abs/0705.0512v1

Astrophys.J.665:341-354,2007

Astronomy and Astrophysics

Astrophysics

29 pages, accepted for publication in ApJ

Scientific paper

10.1086/519270

We report our search for optically thick radio cores in sixteen narrow-waist bipolar nebulae. Optically thick cores are a characteristic signature of collimated ionized winds. Eleven northern nebulae were observed with the Very Large Array (VLA) at 1.3 cm and 0.7 cm, and five southern nebulae were observed with the Australia Telescope Compact Array (ATCA) at 6 cm and 3.6 cm. Two northern objects, 19W32 and M 1-91, and three southern objects, He 2-25, He 2-84 and Mz 3, were found to exhibit a compact radio core with a rising spectrum consistent with an ionized jet. Such jets have been seen in M 2-9 and may be responsible for shaping bipolar structure in planetary nebulae.

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