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arXiv 1003.4500astro-ph.CO
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室女星系团核心团内光的光学颜色

Optical Colors of Intracluster Light in the Virgo Cluster Core

Craig S. Rudick, J. Christopher Mihos, Paul Harding, John J. Feldmeier, Steven Janowiecki, Heather L. Morrison

摘要:

我们继续我们的深光学成像调查的室女星系团使用CWRU伯勒尔施密特望远镜提出的B波段表面测光的核心的室女星系团,以研究该集团的团内光(ICL)。我们发现ICL特征低至mu_b~29 mag sq。这证实了Mihos等人(2005)的结果,他们使用V波段成像在室女星系团核心看到了一个由低表面亮度流、弧、羽流和漫射光组成的巨大网络。通过结合这两个数据集,我们能够测量许多星团低表面亮度特征的光学颜色。虽然我们的大部分成像区域被星系卷云污染,但靠近cD星系M87的星团核心是清晰的。我们追踪M87的颜色轮廓到超过2000弧秒,并发现一个蓝色的趋势与半径,继续到最大的半径。此外,我们还测量了几个ICL特征的颜色,这些特征延伸到M87的最外层,发现它们与M87的晕本身有相似的颜色,B-V~0.8。这些特征的共同颜色表明,像M87这样的cD星系的扩展外层可能是由类似的流形成的,这些流是由星系团内部的潮汐相互作用产生的,后来溶解在星系团势中的平滑背景中。

英文摘要:

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 mu_b ~ 29 mag sq. arcsec, confirming the results of Mihos et al. (2005), 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 arcsec, 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 suggests 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.

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