Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..895l&link_type=abstract
Astronomy and Astrophysics, v.308, p.895-907
Astronomy and Astrophysics
Astrophysics
39
Ism: Individual Objects: Ngc 7023, Ism: Reflection Nebulae, Ism: Molecules, Molecular Processes, Infrared: Ism: Lines
Scientific paper
Using the Canada-France-Hawaii telescope to observe the reflection nebula NGC 7023, we have obtained a 0.8" spatial resolution image of vibrationally excited H_2_ in the v=1-0S(1) line at 2.121mm and in the v=1-0S(2) line at 2.033mm. As in earlier observations of H_2_ IR fluorescence in NGC 2023 (Field et al. 1994), the image shows narrow filamentary structure. These structures show spatial correlations, but also anti-correlations, with the structure of extended red emission (ERE), with implications for the mechanism of ERE. Spatial variations in the S(1) emission and in the ratio of S(1) to S(2) emission are found in regions lying within a one to a few arcseconds of each other. This is interpreted in terms of small scale structures in the gas in the H_2_ emission zone, on a scale of 0.004pc or less. Our most recent models of VUV excitation of H_2_ IR fluorescence, by light from a nearby star, give a good estimate for the observed peak brightness in the v=1-0S(1) line.
Field David
Gerin Maryvonne
Leach Samuel
Lemaire Jean Louis
Pineau des Forêts Guillaume
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