New observations of H_2 vibrational fluorescence in NGC2023

Details New observations of H_2 vibrational fluorescence in NGC2023 New observations of H_2 vibrational fluorescence in NGC2023

May 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...333..280f&link_type=abstract

Astronomy and Astrophysics, v.333, p.280-286 (1998)

Astronomy and Astrophysics

Astrophysics

22

Ism: Individual Objects: Ngc2023, Reflection Nebulae, Molecules, Molecular Processes, Infrared: Ism: Lines, Continuum

Scientific paper

The Canada-France-Hawaii Telescope has been used to obtain images of NGC2023 in the 1-0 S(1) and 1-0 S(2) lines of vibrationally excited H2 at 2.121 mu m and 2.033 mu m, respectively, at a spatial resolution of 0.8". Images show the presence of widespread emission exhibiting structure on a milliparsec scale. Using the latest estimates of the VUV field of the exciting star HD37903, steady-state photodissociation region (PDR) models are able to reproduce the brightness of the observed emission with good accuracy, showing that the number density in the emitting region is ~ 10(5) cm(-3) .

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