H 2 16 O and H 2 18 O maser emission from gas-dust clouds

被引：6
|
作者：
Nesterenok, A. V. [1 ]
Varshalovich, D. A. [1 ]
机构：
[1] AF Ioffe Phys Tech Inst, St Petersburg 194021, Russia
来源：
ASTRONOMY LETTERS-A JOURNAL OF ASTRONOMY AND SPACE ASTROPHYSICS | 2011年 / 37卷 / 07期
基金：
俄罗斯基础研究基金会;
关键词：
astrophysical masers; heavy-oxygen water; star-forming regions; active galactic nuclei; SUBMILLIMETER WATER MASERS; ACTIVE GALACTIC NUCLEI; DISSOCIATION-ENERGY; RADIATIVE-TRANSFER; ACCRETION DISK; EXCITATION; H2O; ASYMMETRY; NGC-4258; DATABASE;
D O I：
10.1134/S1063773711070036
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The collisional pumping of H (2) (16) O and H (2) (18) O masers in hot dense gas-dust clouds has been simulated numerically. New data on the rate coefficients for collisional transitions from Faure et al. (2007) were used in the calculations. The possibility of detecting H (2) (18) O emission in 22.2-GHz H (2) (16) O maser sources is investigated. The medium is shown to become optically thick in the H (2) (18) O lines for which an inverted level population is observed at H2O column densities of similar to 1019-1020 cm(-2). A simultaneous observation of H (2) (18) O emission and H (2) (16) O maser emission in the same source will allow the physical conditions in the gas-dust cloud to be refined.
引用
收藏
页码：456 / 467
页数：12
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