Theoretical models of photodissociation fronts

被引：18

作者：

Draine, BT ^{[1
]}

Bertoldi, F ^{[1
]}

机构：

[1] Princeton Univ Observ, Princeton, NJ 08544 USA

来源：

MOLECULAR HYDROGEN IN SPACE | 2000年

关键词：

D O I：

10.1017/CBO9780511564635.019

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Observations of H-2 line emission have revealed higher-than-expected gas temperatures in a number of photodissociation fronts. We discuss the heating and cooling processes in photodissociation regions. Observations of NGC 2023 are compared to a theoretical model in which there is substantial gas at temperatures T = 500 - 1000K heated by photoelectric emission and collisional de-excitation Of H-2. In general the model successfully reproduces the observed H2 line emission from a wide range of energy levels. The observed [Sill] 34.8mum emission appears to indicate substantial depletion of Si in NGC 2023.

引用

页码：131 / 138

页数：8

共 19 条

[1]

ABGRALL H, 1993, ASTRON ASTROPHYS SUP, V101, P323

[2]

ABGRALL H, 1993, ASTRON ASTROPHYS SUP, V101, P273

[3]

ABGRALL H, 1989, ASTRON ASTROPHYS SUP, V79, P313

[4] Nonequilibrium photodissociation regions: Ionization dissociation fronts [J].

Bertoldi, F ;

Draine, BT .

ASTROPHYSICAL JOURNAL, 1996, 458 (01) :222-232

[5]

BERTOLDI F, 2000, UNPUB

[6]

BERTOLDI F, 2000, IN PRESS IAU S, V197

[7] FLUORESCENT EXCITATION OF INTERSTELLAR H2 [J].

BLACK, JH ;

VANDISHOECK, EF .

ASTROPHYSICAL JOURNAL, 1987, 322 (01) :412-449

[8] Near-IR fluorescent molecular hydrogen emission from NGC 2023 [J].

Burton, MG ;

Howe, JE ;

Geballe, TR ;

Brand, PWJL .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF AUSTRALIA, 1998, 15 (02) :194-201

[9] Structure of stationary photodissociation fronts [J].

Draine, BT ;

Bertoldi, F .

ASTROPHYSICAL JOURNAL, 1996, 468 (01) :269-289

[10]

Field D, 1998, ASTRON ASTROPHYS, V333, P280

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