1998A&A...333..280F

Query : 1998A&A...333..280F

1998A&A...333..280F - Astronomy and Astrophysics, volume 333, 280-286 (1998/5-1)

New observations of H2 vibrational fluorescence in NGC 2023.

FIELD D., LEMAIRE J.L., PINEAU DES FORETS G., GERIN M., LEACH S., ROSTAS F. and ROUAN D.

Abstract (from CDS):

The Canada-France-Hawaii Telescope has been used to obtain images of NGC 2023 in the 1-0 S(1) and 1-0 S(2) lines of vibrationally excited H2 at 2.121µm and 2.033µm, 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 HD 37903, 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 ≃105cm–3.

Abstract Copyright: ∼

Journal keyword(s): ISM: individual objects: NGC 2023 - reflection nebulae - molecules - molecular processes - infrared: ISM: lines - continuum

CDS comments: Regions in t.1 and stars C, E in fig.3 not in SIMBAD. Objects HHN = [MOW87] NGC 2023 HHN

Simbad objects: 12

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Number of rows : 12
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 HD 2007 * 00 24 13.0275861168 -16 46 12.051990192   9.67 9.46     A3III 25 0
2 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 511 0
3 [MOW87] NGC 2023 HH1C HH 05 41 31.41 -02 17 28.4           ~ 3 0
4 [MOW87] NGC 2023 HH1B HH 05 41 31.43 -02 17 23.6           ~ 3 0
5 [MOW87] NGC 2023 HH1A HH 05 41 31.92 -02 17 26.0           ~ 3 0
6 [MOW87] NGC 2023 HH4 HH 05 41 33.0 -03 56 58           ~ 4 0
7 [MOW87] NGC 2023 HH5 HH 05 41 33.91 -02 17 17.6           ~ 4 0
8 NGC 2023 RNe 05 41 37.9 -02 15 52           ~ 635 1
9 HD 37903 Em* 05 41 38.3891026008 -02 15 32.479650720 7.32 7.94 7.83 7.64 7.52 B3IV 363 0
10 LDN 1630 DNe 05 45.5 -00 59           ~ 381 0
11 HD 38858 PM* 05 48 34.9402551240 -04 05 40.721787744 6.71 6.61 5.97     G2V 304 1
12 NGC 7023 RNe 21 01 36.9 +68 09 48           ~ 702 0

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