Stellar population analysis on the stacked spectra of double-peaked emission-line galaxies
Stellar population analysis on the stacked spectra of double-peaked emission-line galaxies
复制标题
双峰发射线星系叠加光谱的星族分析
DOI：
10.1088/1674-4527/19/9/126
复制
发表时间：
2019-04
期刊：
影响因子：
--
通讯作者：
A-Li Luo
中科院分区：
文献类型：
--
作者：
Meng-Xin Wang;A-Li Luo
双峰发射线星系长期以来被认为是与星系合并或其他具有扰动动力学活动（如外流和盘旋转）的现象有关的天体。为了找到这些天体的独特活动与其星族物理之间的联系，我们研究了大天区多天体光纤光谱望远镜（LAMOST）数据发布4（DR 4）和斯隆数字巡天（SDSS）数据发布7（DR 7）数据库中双峰发射线星系的堆叠光谱的星族。我们根据Baldwin-Phillips-Terlevich（BPT）对每对蓝移和红移分量的诊断，将选定的双峰发射线对象分为10种不同类型的对，然后将每组的光谱叠加进行分析。利用STARLIGHT软件对每个叠加光谱进行拟合，并对不同年龄和金属丰度的恒星贡献进行量化，以便于后续的比较研究和分析。为了突出这些双峰发射物体的共性和独特性，我们比较了双峰发射线星系的堆叠光谱与其对应的参考样本显示单峰发射功能的人口合成结果。参比样品也从LAMOST DR 4和SDSS DR 7数据库中选择。对比结果证实了恒星星族与其光谱类之间的强相关性，并发现双峰发射现象更可能发生在“较老”的恒星环境中，不同BPT组分的恒星子群将表现出明显的异质性星星形成历史。
Double-peaked emission-line galaxies have long been perceived as objects related to merging galaxies or other phenomenawith disturbed dynamical activities, such as outflows and disk rotation. In order to find the connection between the unique activities happening in these objects and their stellar population physics, we study the stellar populations of the stacked spectra drawn from double-peaked emission-line galaxies in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) Data Release 4 (DR4) and the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) databases. We group the selected double-peaked emission-line objects into 10 different types of pairs based on the Baldwin-Phillips-Terlevich (BPT) diagnosis for each pair of blueshifted and redshifted components, and then stack the spectra of each group for analysis. The software STARLIGHT is employed to fit each stacked spectrum, and the contributions of stars at different ages and metallicities are quantified for subsequent comparative study and analysis. To highlight the commonality and uniqueness in these double-peaked emitting objects, we compare the population synthesis results of the stacked spectra of double-peaked emission-line galaxies with those of their counterpart reference samples displaying single-peaked emission features. The reference samples are also selected from the LAMOST DR4 and SDSS DR7 databases. From the comparison results, we confirm the strong correlations between stellar populations and their spectral classes, and find that the double-peaked emitting phenomenon is more likely to occur in an ‘older’ stellar environment and the subgroups hosting different BPT components will show an obvious heterogeneous star formation history.
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DOI：
10.1111/j.1365-2966.2005.09238.x
发表时间：
2004-11
影响因子：
4.8
作者：
V. Springel;T. Matteo;L. Hernquist
通讯作者：
V. Springel;T. Matteo;L. Hernquist
DOI：
10.1088/0004-637x/716/1/131
发表时间：
2010-04
期刊：
The Astrophysical Journal
影响因子：
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作者：
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DOI：
10.3847/1538-4357/aae2b4
发表时间：
2018-10
期刊：
The Astrophysical Journal
影响因子：
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作者：
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通讯作者：
J. Comerford;R. Nevin;A. Stemo;F. Müller-Sánchez;F. Müller-Sánchez;R. Barrows;M. Cooper;J. Newman-J.
DOI：
10.1088/0067-0049/201/2/31
发表时间：
2012-08
期刊：
The Astrophysical Journal Supplement Series
影响因子：
--
作者：
J. Ge;Chen Hu;Jian-Min Wang;J. Bai;Shu Zhang
通讯作者：
J. Ge;Chen Hu;Jian-Min Wang;J. Bai;Shu Zhang
DOI：
10.1111/j.1365-2966.2006.10565.x
发表时间：
2005-11
影响因子：
4.8
作者：
A. Mateus;L. Sodré;R. C. Fernandes;G. Stasińska;W. Schoenell;Jean M. Gomes IAG-USP;Brazil Ufsc;
通讯作者：
A. Mateus;L. Sodré;R. C. Fernandes;G. Stasińska;W. Schoenell;Jean M. Gomes IAG-USP;Brazil Ufsc;