Fluorescent molecular hydrogen emission from the reflection nebula NGC 2023

Details Fluorescent molecular hydrogen emission from the reflection nebula NGC 2023 Fluorescent molecular hydrogen emission from the reflection nebula NGC 2023

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...318l..73g&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 318, July 15, 1987, p. L73-L76.

Astronomy and Astrophysics

Astrophysics

126

Fluorescence, Hydrogen, Molecular Clouds, Reflection Nebulae, Continuous Radiation, Interstellar Matter, Near Infrared Radiation, Stellar Envelopes

Scientific paper

Observations of NGC 2023, obtained at 1.4-2.5 microns using the circular variable filter and a Fabry-Perot interferometer on the 3.8-m UKIRT during August 1984 and December 1985, are reported. Maps in the v = (1-0) S1 line of H2, in the J = (1-0) line of (C-12)O, and at 1.65 and 2.2 microns are presented and characterized in detail. UV-pumped H2 fluorescence is found to come from a circumstellar thin shell of radius 0.3 pc, which appears broken, clumpy, and nonspherical due to internal density variations and which lies just outside the nebula of 1-nm-radius grains proposed by Sellgren (1984) on the basis of continuum observations.

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