H2 Line Ratios to Discriminate Dense Photodissociation Regions from Shocks: Application to NGC 2023 and NGC 7023

Details H2 Line Ratios to Discriminate Dense Photodissociation Regions from Shocks: Application to NGC 2023 and NGC 7023 H2 Line Ratios to Discriminate Dense Photodissociation Regions from Shocks: Application to NGC 2023 and NGC 7023

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...529..268t&link_type=abstract

The Astrophysical Journal, Volume 529, Issue 1, pp. 268-278.

Astronomy and Astrophysics

Astronomy

18

Infrared: Ism: Lines And Bands, Ism: Individual (Ngc 2023, Ngc 7023), Ism: Molecules, Ism: Reflection Nebulae

Scientific paper

We measured the distribution of H2 line ratios, 2-1 S(1)/1-0 S(1) and 4-2 S(1)/3-1 S(1), in typical dense photodissociation regions (PDRs) associated with the reflection nebulae, NGC 2023 and NGC 7023. The line images were obtained with a recently developed wide-field (3.9′x3.9′) Fabry-Perot imager, MUSE. In both objects, the 2-1 S(1)/1-0 S(1) ratio varies spatially between 0.2 and 0.6 as a result of the variation of gas density (n~105-106 cm-3) and UV intensity (G0~103-104) in PDRs. On the other hand, the 4-2 S(1)/3-1 S(1) ratio is nearly constant (~1) in both objects. This constancy of the 4-2 S(1)/3-1 S(1) ratio agrees with model predictions. Since the observed 4-2 S(1)/3-1 S(1) ratio is significantly larger than the expected ratio for shock excitation, the 4-2 S(1)/3-1 S(1) ratio is expected to discriminate both dense and diffuse PDRs from shocks.

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