论文标题

病毒质量会驱动集群内的光吗?来自拉斯维加斯的ICL和m $ _ {vir} $之间的关系

Does the virial mass drive the intra-cluster light? The relationship between the ICL and M$_{vir}$ from VEGAS

论文作者

Ragusa, Rossella, Iodice, Enrichetta, Spavone, Marilena, Montes, Mireia, Forbes, Duncan A., Brough, Sarah, Mirabile, Marco, Cantiello, Michele, Paolillo, Maurizio, Schipani, Pietro

论文摘要

在这封信中,我们重新审视了群集内光(ICL)的比例与宿主光环中早期类型星系的比例之间的关系。这是基于当地宇宙中22组和星系簇的统计学意义和均匀样本($ z \ leq 0.05 $),该样本是通过VST早期型星系调查(VEGAS)获得的。利用长期集成时间和大面积的维加斯图像,我们能够将Galaxy郊区映射到$μ_g$ $ \ $ \ geq $ 29-30 mag/arcsec $^2 $,并将数百个kpc。使用此数据集,我们已经扩展了ICL测量的样本,将文献可从Z $ \ leq $ 0.05提供的先前措施增加一倍。这项工作的主要结果是ICL的分数与宿主环境的病毒质量之间缺乏任何重大趋势,涵盖了广泛的病毒质量($ \ sim $ $ $ 10^{12.5} \ leq m_ {vir} \ leq 10^{15.5} {15.5} M _ {\ odot} $ {\ odot} $),与某些研究有关。由于新的数据点都以相同的方法和相同的观察设置得出,并且都具有可比的深度,因此观察到的较大的散布表明ICL分数的固有变化。另一方面,ICL的比例与较大的型号的元素和较大的元素统计数据的统计数据在ICL中的较低分数之间存在较弱的关系,而ICL的较大型号则是iCL的统计数据。 ICL与主机系统的动态状态之间的连接。

In this Letter we revisit the relationship between the fraction of the intra-cluster light (ICL) and both the virial mass and the fraction of Early Type Galaxies in the host halo. This is based on a statistically significant and homogeneous sample of 22 groups and clusters of galaxies in the local Universe ($z \leq 0.05$), obtained with the VST Early-type GAlaxy Survey (VEGAS). Taking advantage of the long integration time and large area of the VEGAS images, we are able to map the galaxy outskirts and ICL down to $μ_g$ $\geq$ 29-30 mag/arcsec$^2$ and out to hundreds of kpc. With this data-set, we have expanded the sample of ICL measurements, doubling the previous measures available from the literature for z $\leq$ 0.05. The main result of this work is the lack of any significant trend between the fraction of ICL and the virial mass of the host environment, covering a wide range of virial masses ( $\sim$ $10^{12.5} \leq M_{vir} \leq 10^{15.5} M_{\odot}$), in agreement with some theoretical studies. Since the new data points are all derived with the same methodology and from the same observational setup, and all have comparable depth, the large observed scatter indicates an intrinsic variation in the ICL fraction.On the other hand, there is a weak relation between the fraction of ICL and the fraction of Early Type Galaxies in the host halo, where a larger fraction of ICL is found in groups and clusters of galaxies dominated by earlier morphological types, indicating a connection between the ICL and the dynamical state of the host system.

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