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首页> 外文期刊>The Astrophysical journal >OPTICAL COLORS OF INTRACLUSTER LIGHT IN THE VIRGO CLUSTER CORE
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OPTICAL COLORS OF INTRACLUSTER LIGHT IN THE VIRGO CLUSTER CORE

机译:处女座核心中的内部光的光学颜色

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We continue our deep optical imaging survey of the Virgo cluster using the CWRU Burrell Schmidt telescope by presenting B-band surface photometry of the core of the Virgo cluster in order to study the cluster's intracluster light (ICL). We find ICL features down to μ B ?≈29 mag arcsec–2, confirming the results of Mihos et?al., who saw a vast web of low surface brightness streams, arcs, plumes, and diffuse light in the Virgo cluster core using V-band imaging. By combining these two data sets, we are able to measure the optical colors of many of the cluster's low surface brightness features. While much of our imaging area is contaminated by galactic cirrus, the cluster core near the cD galaxy, M87, is unobscured. We trace the color profile of M87 out to over 2000'', and find a blueing trend with radius, continuing out to the largest radii. Moreover, we have measured the colors of several ICL features which extend beyond M87's outermost reaches and find that they have similar colors to the M87's halo itself, B – V ≈0.8. The common colors of these features suggest that the extended outer envelopes of cD galaxies, such as M87, may be formed from similar streams, created by tidal interactions within the cluster, that have since dissolved into a smooth background in the cluster potential.
机译:通过介绍处女座星团核心的B波段表面光度法,我们将继续使用CWRU Burrell Schmidt望远镜对处女座星团进行深层光学成像调查,以研究星团的团簇内光(ICL)。我们发现ICL的特征低至μB?≈29mag arcsec–2,证实了Mihos等人的结果,他在处女座星团核心中看到了由低表面亮度流,电弧,羽状流和漫射光组成的庞大网络V波段成像。通过合并这两个数据集,我们能够测量群集的许多低表面亮度特征的光学颜色。尽管我们的大部分成像区域都受到银河卷云的污染,但cD银河系M87附近的星团核心并未被遮挡。我们将M87的颜色轮廓追溯到2000英寸以上,并发现半径呈蓝色的趋势,一直延伸到最大半径。此外,我们测量了几个MCL特征的颜色,这些特征超出了M87的最远范围,发现它们具有与M87的光晕本身相似的颜色,B – V≈0.8。这些特征的共同颜色表明,cD星系的扩展外壳(例如M87)可能是由相似的流形成的,这些流是由团簇内的潮汐相互作用产生的,此后已经溶解到团簇势能的平滑背景中。

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