Spitzer Observations of Planetary Nebulae - 2

Details Spitzer Observations of Planetary Nebulae - 2 Spitzer Observations of Planetary Nebulae - 2

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30285f&link_type=abstract

Spitzer Proposal ID #30285

Computer Science

Scientific paper

Several interesting results have been obtained so far from our initial programs of observations of Planetary Nebulae (PNe) with Spitzer. The emission from PNe in the IRAC bands is redder than expected, due mainly to stronger than expected emission in the 8.0 ?m band due to lines of molecular hydrogen (H2) and forbidden line emission from the ionized gas. The IRAC images have detected new structures in some nebula (e.g., NGC 246) and has detected H2 emission far out in the halos of several PNe (NGC 6543, NGC 6720, NGC 7293). We are proposing several new observations to follow-up on these results. There are three categories of new observations: follow-up IRAC mapping related to previously observed PNe, follow-up IRS spectra of PNe that have been previously imaged with IRAC, and new IRAC imaging of an additional sample of PNe. These new observations will enable us to map the full extent of the large PNe observed, to determine the components of the emission detected in the IRAC images and ascertain its temperature and excitation mechanisms, and search new PNe for emission from H2 and dust in their halos.

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