NEW OBSERVATIONS OF H-2 VIBRATIONAL FLUORESCENCE IN NGC-2023

Authors
FIELD D LEMAIRE JL DESFORETS GP GERIN M LEACH S ROSTAS F ROUAN D
Citation
D. Field et al., NEW OBSERVATIONS OF H-2 VIBRATIONAL FLUORESCENCE IN NGC-2023, Astronomy and astrophysics, 333(1), 1998, pp. 280-286
Citations number
35
Categorie Soggetti
Astronomy & Astrophysics
Journal title
Astronomy and astrophysics → ACNP
ISSN journal
00046361
Volume
333
Issue
1
Year of publication
1998
Pages
280 - 286
Database
ISI
SICI code
0004-6361(1998)333:1<280:NOOHVF>2.0.ZU;2-0
Abstract
The Canada-France-Hawaii Telescope has been used to obtain images of N GC 2023 in the 1-0 S(1) and 1-0 S(2) lines of vibrationally excited H- 2 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 VU V field of the exciting star HD 37903, steady-state photodissociation region (PDR) models are able to reproduce the brightness of the observ ed emission with good accuracy, showing that the number density in the emitting region is approximate to 10(5)cm(-3).