Revealing the Photodissociation Region:HST/NICMOS Imaging of NGC 7027
Citations Over TimeTop 10% of 2000 papers
Abstract
We report results from a Hubble Space Telescope (HST) and Near-Infrared Camera and Multiobject Spectrometer (NICMOS) program to study the distribution of hot neutral (molecular hydrogen) and ionized circumstellar material in the young planetary nebulae NGC 7027. HST/NICMOS provided very high spatial resolution imaging in line and continuum emission, and the stability and large dynamic range needed for investigating detailed structures in the circumstellar material. We present dramatic new images of NGC 7027 that have led to a new understanding of the structure in this important planetary nebula. The central star is clearly revealed, providing near-infrared fluxes that are used to directly determine the stellar temperature very accurately (T = 198,000 K). It is found that the photodissociation layer as revealed by near-infrared molecular hydrogen emission is very thin, and is biconical in shape. The interface region is structured and filamentary, suggesting the existence of hydrodynamic instabilities. We discuss evidence for the presence of one or more highly collimated, off-axis jets that might be present in NGC 7027. The evolutionary future of NGC 7027 is discussed.
Related Papers
- → The Formation of Planetary Nebulae(1988)4 cited
- UV Photodissociation of Acetylene in Various Environments(2011)
- → Transition from Red Giants to Planetary Nebulae(1987)23 cited
- → Classification of ISO SWS 01 spectra of proto-planetary nebulae: a search for precursors of planetary nebulae with [WR] central stars(2002)
- ABUNDANCES OF PLANETARY NEBULAE IN M 31 AND M 32(2000)