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arXiv 1107.6017astro-ph.CO
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早型星系Faber-Jackson关系的内禀色散随质量和红移的变化

The intrinsic dispersion of the Faber-Jackson relation for early-type galaxies as function of the mass and redshift

A. Nigoche-Netro, J. A. L. Aguerri, P. Lagos, A. Ruelas-Mayorga, L. J. Sánchez, C. Muñoz-Tuñón, A. Machado

摘要:

目标。最近有报道称,早型星系结构关系的常量级内禀色散是研究这些结构关系的普适性,即研究结构关系是否依赖于光度、波长、红移和/或环境的有用工具。本文研究了Faber-Jackson关系的内禀色散随光度、质量和红移的变化。方法.我们使用的样本约90 000早期类型的星系从斯隆数字巡天(SDSS-DR 7)跨越7 $mag$的星等范围内的$g$和$r$过滤器。我们计算的固有色散的Faber-Jackson关系在近似恒定的幅度和比较,在不同的亮度,质量和红移。结果主要结果如下:(1)Faber-Jackson关系的内禀色散依赖于光度、质量和红移。ii)较亮和较大质量星系的分布比较暗和较小质量星系的分布具有较小的内禀色散。(3)在高红移的明亮大质量星系的分布比在低红移的类似星系具有更小的内禀色散。结论.通过与最近文献中的研究结果的比较,我们得出结论:Faber-Jackson关系的内禀色散可能依赖于星系的历史,也就是说,内禀色散可能依赖于影响星系生命周期的转变事件的数量和性质,如坍缩、吸积、相互作用和合并。

英文摘要:

Aims. Recently it has been reported that the intrinsic dispersion at constant magnitude of the structural relations from early-type galaxies is a useful tool to study the universality of these structural relations, that is to say, to study whether the structural relations depend on luminosity, wavelength, redshift and/or environment. In this work we study the intrinsic dispersion of the Faber-Jackson relation as function of the luminosity, mass and redshift. Methods. We use a sample of approximately 90 000 early-type galaxies from the Sloan Digital Sky Survey (SDSS-DR7) spanning a magnitude range of 7 $mag$ in both $g$ and $r$ filters. We calculate the intrinsic dispersion of the Faber-Jackson relation at approximately constant magnitude and compare this at different luminosities, masses and redshifts. Results. The main results are the following: i) The intrinsic dispersion of the Faber-Jackson relation depends on the luminosity, mass and redshift. ii) The distribution for brighter and more massive galaxies has smaller intrinsic dispersion than that for fainter and less massive galaxies. iii) The distribution of bright and massive galaxies at higher redshift has smaller intrinsic dispersion than those similar galaxies at low redshift. Conclusions. Comparisons of the results found in this work with recent studies from the literature make us conclude that the intrinsic dispersion of the Faber-Jackson relation could depend on the history of galaxies, in other words, the intrinsic dispersion could depend on the number and nature of transformation events that have affected the galaxies along their life times, such as collapse, accretion, interaction and merging.

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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