The smoothness of the interstellar extinction curve in the UV - Comparison with recent laboratory measurements of PAH mixtures
The smoothness of the interstellar extinction curve in the UV - Comparison with recent laboratory measurements of PAH mixtures
复制标题
紫外线中星际消光曲线的平滑度 - 与最近实验室测量的 PAH 混合物的比较
DOI:
10.1051/0004-6361/201118618
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发表时间:
2012
影响因子:
6.5
通讯作者:
Th. Henning
中科院分区:
文献类型:
--
作者:
M. Steglich;Y. Carpentier;C. Jäger;F. Huisken;H.-J. Räder;Th. Henning
ContextAs revealed by high-resolution spectral investigations in the wavelength range between 300 and 400 nm, the interstellar extinction curve does not display any of the sharp electronic absorption bands that are characteristic for large polyatomic molecules, such as polycyclic aromatic hydrocarbons (PAHs), which belong to the most abundant interstellar molecules.AimsWe aim to verify whether the absorption curves of mixtures of medium-sized PAHs produced in the laboratory can explain the astronomical observations.MethodsThe PAH mixtures were synthesized by infrared laser pyrolysis and subsequent chemical extraction and size separation. The matrix isolation technique was used to study the absorption spectra of isolated molecules at low temperature.ResultsOur experimental results demonstrate that the UV-visible absorption curves of PAH mixtures can be very smooth, displaying no sharp bands, if the molecular diversity is sufficiently high.ConclusionsIn view of the absence of sharp electronic features on the interstellar extinction curve for 300 <λ< 400 nm, we conclude from our experimental findings that the interstellar PAH population must be very diverse. The low fractional abundances of individual species prevent their detection on the basis of spectral fingerprints in the UV.
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DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
S. Cradock;A. Hinchcliffe
通讯作者:
A. Hinchcliffe
影响因子:
6.5
作者:
R. Ruiterkamp;T. M. Halasinski;Farid Salama;B. Foing;L. Allamandola;W. Schmidt;P. Ehrenfreund
通讯作者:
P. Ehrenfreund
DOI:
10.1088/0004-637x/742/1/2
发表时间:
2011-08
期刊:
The Astrophysical Journal
影响因子:
--
作者:
M. Steglich;Jordy Bouwman;F. Huisken;Thomas Henning
通讯作者:
M. Steglich;Jordy Bouwman;F. Huisken;Thomas Henning
DOI:
--
发表时间:
--
期刊:
影响因子:
--
作者:
L. Beegle;T. Wdowiak;M. S. Robinson;J. Cronin;M. McGehee;S. Clemett;S. Gillette
通讯作者:
S. Gillette
DOI:
--
发表时间:
2004
期刊:
影响因子:
--
作者:
É. Habart;A. Natta;E. Krugel
通讯作者:
E. Krugel