Physics
Scientific paper
Jun 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20434m&link_type=abstract
Spitzer Proposal ID #20434
Physics
Scientific paper
IC 405 is a reflection/emission nebula recently ''switched on'' by the transit of the runaway 09V star HD 34078. IC 405 has been shown to have a clumpy dust distribution and a highly excited population of H_{2}. The clumpy dust distribution is expected to produce highly anisotropic scattering of the stellar far ultraviolet radiation field. We predict that variations in the intensity of the UV radiation field will tend to destroy small PAH particles and H_{2] in isolated regions. This effect maybe manifest in the relative strength of the 8.6μm feature, presumably due to photodistruction or ionization of the carrier. The clumpy nature of the gas and dust in IC 405 produces a high degree of differential absorption of UV radiation within the nebula. Consequently, we also expect the reradiated thermal infrared to exhibit temperature gradients. We expect these gradients in PAH size distribution, H_{2} column emission, and dust temperature to be higher in IC 405 than in the well studied reflection nebula NGC 7023 where the dust distributions and radiation field variations are less clumped. We propose Spitzer IRAC, IRS, and MIPS observations of IC 405, to test the environmental dependence of PAH emission, look for correlation's between PAHs and fluorescent H_{2}, and create a detailed map of the dust temperature of these regions.
France Kevin
McCandliss Stephan
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