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arXiv 0809.2027astro-ph
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测光红移作为研究后发座星系团星系群的工具

Photometric redshifts as a tool to study the Coma cluster galaxy populations

C. Adami, O. Ilbert, R. Pello, J. C. Cuillandre, F. Durret, A. Mazure, J. P. Picat, M. P. Ulmer

摘要:

我们研究后发座星系团的光度函数(GLF)在微弱的幅度,特别是在u* 波段应用测光红移技术应用到深u*,B,V,R,I图像覆盖的区域~ 1deg 2(R 24)。在B,V,R和I波段的光度红移选择获得的全球和本地GLF与我们以前的统计背景扣除的基础上的结果是一致的。在仅由u* 图像覆盖的区域中,还在应用统计背景减除之后导出GLF。在u* 带的GLF显示出暗端斜率向星系团的外部区域增加(从星系团中心的α ~1到星系团外围的α ~2)。这可以解释为,假设这些星系在进入星团时有一个短暂的恒星形成爆发。对晚型星系空间分布的分析表明,晚型星系成团分布在星系团外围,在那里还检测到X射线亚结构,而且u* 带的GLF较陡。

英文摘要:

We investigate the Coma cluster galaxy luminosity function (GLF) at faint magnitudes, in particular in the u* band by applying photometric redshift techniques applied to deep u*, B, V, R, I images covering a region of ~1deg2 (R 24). Global and local GLFs in the B, V, R and I bands obtained with photometric redshift selection are consistent with our previous results based on a statistical background subtraction. In the area covered only by the u* image, the GLF was also derived after applying a statistical background subtraction. The GLF in the u* band shows an increase of the faint end slope towards the outer regions of the cluster (from alpha~1 in the cluster center to alpha~2 in the cluster periphery). This could be explained assuming a short burst of star formation in these galaxies when entering the cluster. The analysis of the multicolor type spatial distribution reveals that late type galaxies are distributed in clumps in the cluster outskirts, where X-ray substructures are also detected and where the GLF in the u* band is steeper.

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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