Near Infrared Spectroscopic Imaging of NGC 7023 and Charge Trapping in Insb Photodiode Arrays

Astronomy and Astrophysics – Astronomy

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Indium Antimonide

Scientific paper

We have performed broadband and narrowband spectroscopic infrared imaging of the reflection nebula NGC7023 over the wavelengths 1.2-3.8μm. The dust composition varies widely across the face of the nebula. Both the 3.3μm and 3.4μm dust emission features are bright and variable across the nebula. The bright filaments in NGC7023 (1) are redder than the ambient nebula, (2) are self shielding, (3) have an 3.29μm line to continuum ratio of ~40, (4) show asymmetric spatial profiles and (5) exhibit a 3.4μm/3.29μm emission feature ratio of one half. A simple Hubble law analysis shows that scattered light is insufficient to account for this surface brightness. We have investigated the far infrared-3.29μm feature luminosity correlation in the context of NGC7023. HD200775, the central star of NGC7023, is the dominant radiative excitation source in the nebula. Of the seven stellar objects observed in the frame (excluding HD200775), two were found to be late-type main sequence stars and the remainder were hypothesized to be protostellar objects. We have demonstrated experimentally and theoretically that the latent image phenomenon in astronomical InSb photodiode infrared focal plane arrays passivated with SiOx can be explained by charge trapping at the front surface of the detector array. The type of front surface passivant and the electrical state of the surface both play crucial roles in determining the magnitude of this effect; SiOx exhibits significantly more image latency than does Si3N4. Behaviorally, the latent images are consistent with a modified Shockley, Read, Hall trapping model. The trap energies and cross sections were determined from experimental data; they are consistent with hole traps in the SiOx that lie within approximately 50A of the SiOx/InSb interface. Quantum mechanical tunneling was proposed as the mechanism for populating and depopulating the traps, and the molecular species In2O3 was advanced as a plausible candidate for the traps responsible for latent images in SiOx passivated InSb.

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