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
复制
发表时间:
2012
影响因子:
6.5
通讯作者:
Th. Henning
Th. Henning
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
M. Steglich;Y. Carpentier;C. Jäger;F. Huisken;H.-J. Räder;Th. Henning

文献摘要

参考文献

被引文献

相似文献

正如在300至400 nm波长范围内的高分辨率光谱研究所揭示的那样,星际消光曲线并没有显示出任何尖锐的电子吸收带,这些吸收带是大的多原子分子的特征,例如多环芳烃(PAH),这些物质属于最丰富的星际分子,目的是验证介质-方法采用红外激光热裂解、化学萃取和粒度分离的方法合成了多环芳烃混合物。结果表明,在分子多样性足够高的条件下,PAH混合物的紫外-可见吸收曲线可以非常平滑,不显示尖锐的吸收带.结论鉴于在300 <λ< 400 nm的星际消光曲线上没有尖锐的电子特征,我们从实验结果中得出结论,星际间的多环芳烃种群一定是非常多样化的。个别物种的丰度分数较低,无法根据紫外光谱指纹进行检测。
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.
基质分离:一种研究反应性无机物质的技术
DOI: --
发表时间: 2011
期刊:
影响因子: --
作者:
S. Cradock;A. Hinchcliffe
通讯作者: A. Hinchcliffe
大型 PAH 的光谱实验室研究以及与漫射星际带的比较
DOI: 10.1051/0004-6361:20020478
发表时间: 2002
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
接受 ApJ 预印本排版,使用 L ATEX 样式 emulateapj v. 10/09/06 气相冷凝实验中多环芳烃和碳固体的形成
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
Herbig Ae/Be 恒星周围星周盘中的 PAH
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