The 15 - 20 Micron Spitzer Spectra of Interstellar Emission Features in NGC 7023

Details The 15 - 20 Micron Spitzer Spectra of Interstellar Emission Features in NGC 7023 The 15 - 20 Micron Spitzer Spectra of Interstellar Emission Features in NGC 7023

2006-12-19

arxiv.org/abs/astro-ph/0612544v1

Astrophys.J.659:1338-1351,2007

Astronomy and Astrophysics

Astrophysics

ApJ, in press, April 2007; 23 pages, 11 figures

Scientific paper

10.1086/511805

We present 15 - 20 micron long-slit spectra, from the Infrared Spectrograph (IRS) on Spitzer, of NGC 7023. We observe recently-discovered interstellar emission features, at 15.9, 16.4, 17.0, 17.4, 17.8, and 18.9 microns, throughout the reflection nebula. The 16.4 micron emission feature peaks near the photodissociation front northwest of the star, as do the aromatic emission features (AEFs) at 3.3, 6.2 and 11.3 microns. The 16.4 micron emission feature is thus likely related to the AEFs and radiates by non-equilibrium emission. The new 18.9 micron emission feature, by contrast, decreases monotonically with stellar distance. We consider candidate species for the 18.9 micron feature, including polycyclic aromatic hydrocarbons, fullerenes, and diamonds. We describe future laboratory and observational research needed to identify the 18.9 micron feature carrier.

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