Polycyclic aromatic hydrocarbon excitation in nearby spiral galaxies
Polycyclic aromatic hydrocarbon excitation in nearby spiral galaxies
复制标题
附近螺旋星系中的多环芳烃激发
DOI：
10.1093/mnras/staa1589
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发表时间：
2020-06
期刊：
影响因子：
--
通讯作者：
Zijlstra A.
中科院分区：
文献类型：
--
作者：
Bendo G. J.;Lu Nanyao;Zijlstra A.
我们研究了多环芳烃（PAH）的激发在25个附近的面对螺旋星系的样本中使用的中红外PAH排放量的尘埃质量的比例。在11个星系中，我们发现PAH激发直接与紫外线（UV）或中红外星星形成示踪剂有关，这与其他研究PAH发射与星星形成关系的结果沿着表明，PAH在恒星形成（SF）区域周围的尘埃壳层中受到最强烈的激发。在另外五个星系，PAH的排放增强周围的SF地区只有在特定的银河系中心半径。在另外六个星系中，PAH激发与演化的恒星种群有更强的相关性，如3.6 μm发射所追踪的。其余三个星系的结果是模糊的。PAH/粉尘比率的径向梯度一般不与log（O/H）梯度相关，除非log（O/H）梯度相对较陡。其中多环芳烃被进化恒星激发的星系具有相对较高的远紫外与中红外比率，这意味着多环芳烃激发与不同恒星种群之间联系的变化与星系内尘埃衰减的变化有关。另外，形态上的差异可能使多环芳烃更有可能被进化的恒星激发，因为六个星系中有五个是晚型絮状螺旋星系。这些异质性的结果表明，描述PAH激发的复杂性，并使用PAH排放作为星星形成示踪剂，以及模拟尘埃排放和辐射传输具有广泛的影响。
We have examined polycyclic aromatic hydrocarbon (PAH) excitation in a sample of 25 nearby face-on spiral galaxies using the ratio of mid-infrared PAH emission to dust mass. Within 11 of the galaxies, we found that the PAH excitation was straightforwardly linked to ultraviolet (UV) or mid-infrared star formation tracers, which, along with other results studying the relation of PAH emission to star formation, indicates that the PAHs are most strongly excited in dusty shells around the star-forming (SF) regions. Within another five galaxies, the PAH emission is enhanced around SF regions only at specific galactocentric radii. In six more galaxies, PAH excitation is more strongly correlated with the evolved stellar populations as traced by 3.6 μm emission. The results for the remaining three galaxies were ambiguous. The radial gradients of the PAH/dust ratios were generally not linked to log(O/H) gradients except when the log(O/H) gradients were relatively steep. Galaxies in which PAHs were excited by evolved stars had relatively high far-UV to mid-infrared ratios, implying that variations in the link between PAH excitation and different stellar populations are connected to changes in dust attenuation within galaxies. Alternately, differences in morphology could make it more likely that PAHs are excited by evolved stars, as five of the six galaxies where this occurs are late-type flocculent spiral galaxies. These heterogeneous results demonstrate the complexity of describing PAH excitation and have broad implications for using PAH emission as a star formation tracer as well as for modelling dust emission and radiative transfer.
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DOI：
10.3847/2041-8205/830/2/l40
发表时间：
2016-10
期刊：
The Astrophysical Journal Letters
影响因子：
--
作者：
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通讯作者：
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影响因子：
4.9
作者：
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影响因子：
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通讯作者：
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DOI：
10.1086/516636
发表时间：
2006-06
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
A. Paz;A. Paz;S. Boissier;B. Madore;B. Madore;M. Seibert;Y. Joe;Y. Joe;A. Boselli;T. Wyder-T.
通讯作者：
A. Paz;A. Paz;S. Boissier;B. Madore;B. Madore;M. Seibert;Y. Joe;Y. Joe;A. Boselli;T. Wyder-T.
DOI：
10.1088/0067-0049/212/2/21
发表时间：
2014-04
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
K. Long;K. Kuntz;W. Blair;L. Godfrey;L. Godfrey;P. Plucinsky;R. Soria;C. Stockdale;P. Winkler
通讯作者：
K. Long;K. Kuntz;W. Blair;L. Godfrey;L. Godfrey;P. Plucinsky;R. Soria;C. Stockdale;P. Winkler