The near-infrared excess continuum in the Orion Bar splits into a roughly 700 K component that tracks the 3.3 micron aromatic band and a hotter, poorly constrained component that does not, with water and CO2 ice absorption from a deeper layer.
Dust Emission Features in NGC 7023 between 0.35 and 2.5 micron: Extended Red Emission (0.7 micron) and Two New Emission Features (1.15 and 1.5 micron)
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abstract
We present 0.35 to 2.5 micron spectra of the south and northwest filaments in the reflection nebula NGC 7023. These spectra were used to test the theory of Seahra & Duley that carbon nanoparticles are responsible for Extended Red Emission (ERE). Our spectra fail to show their predicted second emission band at 1.0 micron even though both filaments exhibit strong emission in the familiar 0.7 micron ERE band. The northwest filament spectrum does show one, and possibly two, new dust emission features in the near-infrared. We clearly detect a strong emission band at 1.5 micron which we tentatively attribute to beta-FeSi_2 grains. We tentatively detect a weaker emission band at 1.15 micron which coincides with the location expected for transitions from the conduction band to mid-gap defect states of silicon nanoparticles. This is added evidence that silicon nanoparticles are responsible for ERE as they already can explain the observed behavior of the main visible ERE band.
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PDRs4All XXII. Near-Infrared continuum in the Orion Bar
The near-infrared excess continuum in the Orion Bar splits into a roughly 700 K component that tracks the 3.3 micron aromatic band and a hotter, poorly constrained component that does not, with water and CO2 ice absorption from a deeper layer.