Resolving the Multiple Outflows in the Egg Nebula with Keck II Laser Guide Star Adaptive Optics
| Autor: | Mignant, D. Le, Sahai, R., Bouchez, A., Campbell, R., van Dam, M., Chin, J., Johansson, E., Hartman, S., Lafon, R., Lyke, J., Stomski, P., Summers, D., Wizinowich, P. |
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| Rok vydání: | 2007 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | The Egg Nebula has been regarded as the archetype of bipolar proto-planetary nebulae, yet we lack a coherent model that can explain the morphology and kinematics of the nebular and dusty components observed at high-spatial and spectral resolution. Here, we report on two sets of observations obtained with the Keck Adaptive Optics Laser Guide Star: H to M-band NIRC2 imaging, and narrow bandpath K-band OSIRIS 3-D imaging-spectroscopy (through the H2 2.121micron emission line). While the central star or engine remains un-detected at all bands, we clearly resolve the dusty components in the central region and confirm that peak A is not a companion star. The spatially-resolved spectral analysis provide kinematic information of the H_2 emission regions in the eastern and central parts of the nebula and show projected velocities for the H_2 emission higher than 100 km/s. We discuss these observations against a possible formation scenario for the nebular components. Comment: 5 pages, 2 figures, to appear in the proceedings of the conference "Asymetrical Planetary Nebula IV", edited by Romano L.M. Corradi, Arturo Manchado and Noam Soker |
| Databáze: | arXiv |
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