Spatial structure of a photo-dissociation region in Ophiuchus

被引:2
作者
Boulanger, F [1 ]
Habart, E [1 ]
Abergel, A [1 ]
Falgarone, E [1 ]
Des Forets, GP [1 ]
Verstraete, L [1 ]
机构
[1] Univ Paris 11, Inst Astrophys Spatiale, F-91405 Orsay, France
来源
MOLECULAR HYDROGEN IN SPACE | 2000年
关键词
D O I
10.1017/CBO9780511564635.033
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present spectroscopic and imaging observations of dust and gas emission from the western edge of the p Ophiuchus molecular cloud facing the B2 III/IV star HD 147889. The emissions from dust heated by the external UV radiation, from collisionally excited and fluorescent H-2 are resolved and observed to coincide spatially. The spectroscopic data allows to estimate the gas temperature to 350 30 K in the H-2 emitting layer. In the framework of a steady state model of the photo-dissociation region, a high formation rate: 210(-16)cm(3)s(-1) at 350 K, seems to be required to account for this temperature. For smaller formation rates the H-2 emitting layer moves into the cloud where the gas is colder due to radiation attenuation.
引用
收藏
页码:211 / 216
页数:6
相关论文
共 10 条
[1]  
ABERGEL A, 1996, ASTRON ASTROPHYS, V315, P329
[2]   THE PHOTOELECTRIC HEATING MECHANISM FOR VERY SMALL GRAPHITIC GRAINS AND POLYCYCLIC AROMATIC-HYDROCARBONS [J].
BAKES, ELO ;
TIELENS, AGGM .
ASTROPHYSICAL JOURNAL, 1994, 427 (02) :822-838
[3]  
Boulanger F, 1998, ASTRON ASTROPHYS, V339, P194
[4]   TIME-DEPENDENT FLUORESCENT H-2 EMISSION [J].
GOLDSHMIDT, O ;
STERNBERG, A .
ASTROPHYSICAL JOURNAL, 1995, 439 (01) :256-263
[5]  
LEBOURLOT J, 1993, ASTRON ASTROPHYS, V267, P233
[6]  
Lemaire JL, 1996, ASTRON ASTROPHYS, V308, P895
[7]   THE COBWEBS OF OPHIUCHUS .1. STRANDS OF (CO)-C-13 - THE MASS-DISTRIBUTION [J].
LOREN, RB .
ASTROPHYSICAL JOURNAL, 1989, 338 (02) :902-924
[8]   The power of adaptive optics: A close look at a molecular cloud in NGC 2023 [J].
Rouan, D ;
Field, D ;
Lemaire, JL ;
Lai, O ;
desForets, GP ;
Falgarone, E ;
Deltorn, JM .
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 1997, 284 (02) :395-+
[10]   THE NEUTRAL ATOMIC PHASES OF THE INTERSTELLAR-MEDIUM [J].
WOLFIRE, MG ;
HOLLENBACH, D ;
MCKEE, CF ;
TIELENS, AGGM ;
BAKES, ELO .
ASTROPHYSICAL JOURNAL, 1995, 443 (01) :152-168