The rotational excitation temperature of the λ6614 diffuse interstellar band carrier

被引：42
|
作者：
Cami, J
Salama, F
Jiménez-Vicente, J
Galazutdinov, GA
Krelowski, J
机构：
[1] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA
[2] Univ Granada, Fac Ciencias, Dept Fis Teor & Cosmos, E-18071 Granada, Spain
[3] Korea Astron Observ, Opt Astron Div, Taejon 305348, South Korea
[4] Special Astrophys Observ, Nizhnii Arkhyz 369167, Russia
[5] Nicholas Copernicus Univ, Ctr Astron, PL-87100 Torun, Poland
来源：
ASTROPHYSICAL JOURNAL | 2004年 / 611卷 / 02期
基金：
美国国家航空航天局; 俄罗斯基础研究基金会;
关键词：
ISM : lines and bands; ISM : molecules;
D O I：
10.1086/423991
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Analysis of high spectral resolution observations of the lambda6614 diffuse interstellar band (DIB) line profile shows systematic variations in the positions of the peaks in the substructure of the profile. These variations-shown here for the first time-can be understood most naturally in the framework of rotational contours of large molecules, where the variations are caused by changes in the rotational excitation temperature. We show that the rotational excitation temperature for the DIB carrier is likely significantly lower than the gas kinetic temperature-indicating that for this particular DIB carrier angular momentum buildup is not very efficient.
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页码：L113 / L116
页数：4
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