Discovery of kpc-scale line emission in barred galaxies, not linked to AGN or star formation.

Discovery of kpc-scale line emission in barred galaxies, not linked to AGN or star formation.
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在棒状星系中发现 kpc 尺度线发射,与活动星系核或恒星形成无关。

DOI:
10.1093/mnras/stv846
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发表时间:
2015
影响因子:
4.8
通讯作者:
James P
James P
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
James P

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我们提出了一个分析的光学线发射附近的棒星系,特别是看径向范围所占据的酒吧。在许多情况下,这一地区的标志是我们所谓的“星星形成沙漠”,在光学窄带H α成像中具有明显的Hiregions缺陷。在这里,我们提出的长缝光谱揭示,这些地区确实有线发射,但它是低水平的,空间平滑,几乎无处不在。H α和光谱上相邻的[Nii]线的相对强度与星星形成区的相对强度完全不同,并且更接近于“LINER”区的预期。我们量化了这些扩展的kpc尺度区域的总谱线发射,并确定了如果解释为正常的H α发射,它对这些星系的星星形成率的虚假贡献。我们同意以前的研究,链接这个'LINER'发射到老恒星的人口,例如后渐近巨型分支恒星,并提出强烈禁止早期型螺旋作为进一步测试这种发射的主要位置。
We present an analysis of the optical line emission from nearby barred galaxies, and in particular look at the radial range occupied by the bar. In many cases, this region is marked by what we term a ‘star formation desert’, with a marked deficit of Hiiregions in optical narrow-band H α imaging. Here we present long-slit spectroscopy revealing that such regions do have line emission, but that it is low-level, spatially smooth and almost ubiquitous. The relative strengths of the H α and the spectrally adjacent [Nii] lines in the regions are completely discrepant from those associated with star formation regions, and more closely match expectations for ‘LINER’ regions. We quantify the total line emission from these extended, kpc-scale regions, and determine the spurious contribution it would make to the determined star formation rate of these galaxies if interpreted as normal H α emission. We concur with previous studies that link this ‘LINER’ emission to old stellar populations, e.g. post-asymptotic giant branch stars, and propose strongly barred early-type spirals as a prime location for further tests of such emission.
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期刊: Proceedings of the International Astronomical Union
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