arXiv 1509.044302015-09-15astro-ph.GA

空穴区半导体的光谱特性

Spectral Properties of Galaxies in Void Regions

Chenxu Liu, Danny Pan, Lei Hao, Fiona Hoyle, Anca Constantin, Micheal S. Vogeley

备注：: 14 pages,16 figures, accepted for publication in ApJ
DOI：: 10.1088/0004-637X/810/2/165

摘要：

本文研究了欠致密大尺度结构、空洞中星系的光谱性质。我们的空星系样本（75,939个星系）是从斯隆数字巡天（SDSS）数据发布7（DR 7）与$\rm z < 0.107$中选择的。我们发现，在光度，恒星质量，恒星星族，和特定的恒星形成率之间没有显着差异的特定光谱类型的空星系和他们的壁对应。然而，在空洞中的恒星形成星系的比例（$\ge 9\%$）显着高于壁。当考虑到所有光谱类型时，空星系比壁星系稍微暗淡，质量较小，有更年轻的恒星星族和更高的特定恒星形成率。这些微小的差异完全是由空洞中恒星形成星系的比例较高造成的。我们确认活动星系核存在于\cite{co08}已经发现的空洞中，其丰度与壁中的丰度相似。I型活动星系核贡献了空星系的$\sim$ 1%~ 2%，与它们在壁中所占的比例相似.本征[O III]光度，跨越$10^6\ L_{\sun} \sim 10^9\ L_{\sun}$，爱丁顿比是相似的比较我们的空AGN与壁AGN。小尺度统计表明，所有光谱类型的空星系都比墙内的对应星系聚集得少。在我们探测的光度范围内，大合并可能不是黑洞吸积的主要触发因素。我们的研究暗示黑洞的生长对大尺度结构的依赖性很弱。

英文摘要：

We present a study of spectral properties of galaxies in underdense large-scale structures, voids. Our void galaxy sample (75,939 galaxies) is selected from the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) with $\rm z < 0.107$. We find that there are no significant differences in the luminosities, stellar masses, stellar populations, and specific star formation rates between void galaxies of specific spectral types and their wall counterparts. However, the fraction of star-forming galaxies in voids is significantly higher ($\ge 9\%$) than that in walls. Void galaxies, when considering all spectral types, are slightly fainter, less massive, have younger stellar populations and of higher specific star formation rates than wall galaxies. These minor differences are totally caused by the higher fraction of star-forming galaxies in voids. We confirm that AGNs exist in voids, already found by \cite{co08}, with similar abundance as in walls. Type I AGNs contribute $\sim$ 1\%-2\% of void galaxies, similar to their fraction in walls. The intrinsic [O III] luminosities , spanning over $10^6\ L_{\sun} \sim 10^9\ L_{\sun}$, and Eddington ratios are similar comparing our void AGNs versus wall AGNs. Small scale statistics show that all spectral types of void galaxies are less clustered than their counterparts in walls. Major merger may not be the dominant trigger of black hole accretion in the luminosity range we probe. Our study implies that the growth of black holes relies weakly on large scale structures.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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