Photodissociated H I in NGC 2023

Details Photodissociated H I in NGC 2023 Photodissociated H I in NGC 2023

Oct 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997rmxaa..33..165l&link_type=abstract

Revista Mexicana de Astronomia y Astrofisica, 33, p. 165- 171 (1997)

Astronomy and Astrophysics

Astronomy

5

Scientific paper

We report the detection of photodissociated H I toward the reflection nebula NGC 2023. The Very Large Array observations reveal compact (~ 0.3 pc) emission associated with the source. The observed spectrum has a double-peaked profile that we believe is caused by absorbing foreground neutral gas. We corrected the observed spectrum for the absorption, and determined with this absorption-corrected profile an H I column density and mass of 1.7 ×1021 cm-2 and 1.2 Modot, respectively. This column density agrees well with theoretical model predictions. The H I 21 cm map shows a morphology very similar to that present in the images of [C II] at 158 μm, HIRES 60 μm IRAS, and POSS optical.

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