STAR CLUSTERS AS TRACERS OF INTERACTIONS IN STEPHAN'S QUINTET (HICKSON COMPACT GROUP 92)

STAR CLUSTERS AS TRACERS OF INTERACTIONS IN STEPHAN'S QUINTET (HICKSON COMPACT GROUP 92)
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星团作为斯蒂芬五重奏中相互作用的示踪剂(希克森紧凑组 92)

DOI:
10.1088/0004-6256/142/2/42
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发表时间:
2011
期刊:
The Astronomical Journal
影响因子:
--
通讯作者:
Fedotov K
Fedotov K
中科院分区:
--
文献类型:
--
作者:
Fedotov K

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斯蒂芬五重奏(SQ,也被称为希克森紧致星系群92)是一个紧凑的星系群,其成员之间表现出许多相互作用的迹象。利用哈勃太空望远镜上的宽视场相机3在早期发布科学项目中获得的b438, v606和i814波段的SQ的高分辨率(每像素0 farcs 04)图像,我们确定了496个候选星团(SCCs),它们位于整个星系本身以及星系间区域。与以前的工作相比,我们的光度测量加深了~ 2等,并覆盖了另外三个区域,老尾巴,NGC 7317和南部碎片区(SDR)。通过比较b438−V 606和v606−I 814的SCCs颜色与简单的恒星群合成模型,我们能够约束星团的年龄。特别是SQ中质量最大的星系NGC 7319,在它的整个历史中呈现出连续的恒星形成,尽管在过去的几十个Myr中速度较低。NGC 7318 A/B和北部恒星爆发区都显示出正在进行的活跃恒星形成;有许多星团的年龄小于10迈珥。NGC 7318 A/B在星团的颜色分布上也有一个特殊的间隙,可以用来确定最近爆发的开始时间。在年轻尾巴中检测到的大多数SCCs形成于150-200迈前,而在老尾巴中星团颜色的紧密分布使我们能够将其形成年龄限制在400迈前。SDR中的星团似乎被分为两组,年龄分别为50和~ 500兆吉珥,而在NGC 7317中检测到的几乎所有scc的年龄都超过2兆吉珥。基于这些年龄,我们估计了触发大质量星团形成的SQ成员之间相互作用的时间间隔。
Stephan's Quintet (SQ; also known as Hickson Compact Group 92) is a compact group of galaxies that exhibits numerous signs of interactions between its members. Using high-resolution (0 farcs 04 per pixel) images of SQ in B 438, V 606, and I 814 bands from the Early Release Science project obtained with the Wide Field Camera 3 on the Hubble Space Telescope, we identify 496 star cluster candidates (SCCs), located throughout the galaxies themselves as well as in intergalactic regions. Our photometry goes∼ 2 mag deeper and covers an additional three regions, the Old Tail, NGC 7317, and the southern debris region (SDR), compared to previous work. Through comparison of the B 438− V 606 and V 606− I 814 colors of the SCCs with simple stellar population synthesis models, we are able to constrain cluster ages. In particular, the most massive galaxy of SQ, NGC 7319, exhibits continuous star formation throughout its history, although at a lower rate over the past few tens of Myr. NGC 7318 A/B and the northern star burst region both show ongoing active star formation; there are a number of star clusters that are younger than 10 Myr. NGC 7318 A/B also features a peculiar gap in the color distribution of the star clusters that can be used to date the onset of the recent burst. The majority of the SCCs detected in the Young Tail were formed 150–200 Myr ago, whereas the tight distribution of star cluster colors in the Old Tail allows us to constrain its age of formation to∼ 400 Myr ago. The star clusters in the SDR are seemingly divided into two groups with ages of 50 and∼ 500 Myr, and virtually all of the SCCs detected in NGC 7317 are over 2 Gyr old. Based on these ages, we estimate time intervals for the interactions between SQ members that triggered the massive star cluster formation.
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