Dissecting the orbital and stellar-population structure of early-type galaxies with MUSE

用 MUSE 剖析早期型星系的轨道和恒星族结构

基本信息

  • 批准号:
    ST/T000503/1
  • 负责人:
  • 金额:
    $ 22.18万
  • 依托单位:
  • 依托单位国家:
    英国
  • 项目类别:
    Research Grant
  • 财政年份:
    2020
  • 资助国家:
    英国
  • 起止时间:
    2020 至 无数据
  • 项目状态:
    已结题

项目摘要

How galaxies form and evolve is a key open question in modern astronomy, driving billions of dollars of international research infrastructure investment over the next ten years. Modern cosmological computer simulations of how galaxies form show that the orbits of stars and their element-abundance hold as-yet untapped information on both on how star-formation proceeded over time in galaxies and how these also grew by accreting other companion galaxies.The project proposed here will uncover this `fossil record' by making full use of the unprecedented quality collected for galaxies in the nearby Fornax galaxy cluster (the Fornax3D project, led by applicant Sarzi) with the MUSE integral-field spectrograph installed on the Very Large Telescope of the European Southern Observatory. Such integral-field spectroscopic data allow indeed to measure the mean stellar spectrum observed at any particular point in these, which in turn allows to infer the mean motion of stars at that same point as well as an estimate of the mean stellar age and chemical content. This information is generally sufficient for Astronomers in the case of those galaxies where we have reasons to believe that stars formed over one single event. For most galaxies this is not the case, however, and the arduous task ahead is that of identifying from the data the different families of stars are currently present in galaxies, and understand how and when these came to be. For instance, the Milky Way and other disk galaxies is formed of three main stellar components. A central spherical bulge of old stars, a thin disk where young stars continue to form and relic, thicker disk of older stars. In the case of galaxies where star-formation is no longer occurring, the so-called early-type galaxies (ETGs, known also as elliptical or lenticular galaxies) the situation is less clear, although it evidence has been mounting that most of these objects do also harbour three distinct bulge, thin and thick components. This would also be in keeping with the idea that most ETGs descend from disk galaxies such as the Milky Way, although exactly how remains to be understood. Indeed, understanding this potential link is precisely the goal of this project, which aims understanding for instance how quickly stars ceased to form in the disk components ETGs and what role was played in particular by galactic environment, such as entering a group of galaxies like the Fornax cluster which is typical of where ETGs tend to live.To tackle the difficult problem of measuring the star-formation history of each of the disk components of ETGs, here we will draw from the unique modelling expertise within for Fornax3D collaboration to first identify the main families of stars in ETGs on the basis of their stellar orbits and models that can match simultaneously the observed stellar light distribution and stellar motions. These models will then allow to know how many stars move in which way at any point in the target galaxy for each stellar family (e.g. bulge stars, thick and thin disk stars), which will make it much more easier (and robust) to deduce from the observed stellar spectra the mean age and chemical content of the stars from each stellar family that we observe at that same point. Mapping the stellar age of the faded stellar disks of ETGs will already inform us on the processes that led to the cessation of star formation, as some processes will imprint different age trend with distance from the galaxy centre.
星系如何形成和演化是现代天文学的一个关键开放问题,在未来十年内推动数十亿美元的国际研究基础设施投资。对星系形成过程的现代宇宙学计算机模拟表明,恒星的轨道及其元素丰度包含了尚未开发的信息,既可以解释星系中恒星形成过程如何随着时间的推移而进行,也可以解释这些恒星如何通过吸积其他伴星系而成长。这里提出的项目将充分利用在附近的天炉座星系团中收集到的前所未有的质量,来揭示这一“化石记录”(Fornax 3D项目,由申请人Sarzi领导),MUSE积分场摄谱仪安装在欧洲南方天文台的甚大望远镜上。这样的积分场光谱数据确实允许测量在这些中的任何特定点观察到的平均恒星光谱,这反过来又允许推断在同一点的恒星的平均运动以及估计平均恒星年龄和化学含量。对于天文学家来说,这些信息通常足够了,因为我们有理由相信这些星系的恒星是在一次事件中形成的。然而,对于大多数星系来说,情况并非如此,未来的艰巨任务是从数据中确定目前存在于星系中的不同恒星家族,并了解它们是如何以及何时出现的。例如,银河系和其他盘状星系是由三个主要的恒星组成。一个由老恒星组成的中央球形凸起,一个薄的圆盘,年轻的恒星在那里继续形成和残留,更厚的圆盘由老恒星组成。在恒星形成不再发生的星系中,所谓的早期型星系(ETG,也被称为椭圆星系或透镜星系)的情况不太清楚,尽管越来越多的证据表明大多数这些物体也有三个不同的凸起,薄和厚的组件。这也与大多数ETG起源于银河系等盘状星系的想法一致,尽管确切的方式仍有待理解。事实上,了解这种潜在的联系正是该项目的目标,该项目旨在了解例如恒星在ETG盘组件中停止形成的速度以及银河系环境特别发挥的作用,例如进入一群像天炉座星系团这样的星系,这是ETG通常居住的地方。为了解决测量星星的难题,为了了解ETG每个盘组成部分的形成历史,在这里,我们将借鉴Fornax3D合作中独特的建模专业知识,首先根据恒星轨道和模型识别ETG中的主要恒星家族,这些恒星轨道和模型可以同时匹配观测到的恒星光分布和恒星运动。然后,这些模型将允许知道有多少恒星在目标星系中的任何一点以何种方式移动,对于每个恒星家族(例如,膨胀星,厚盘星和薄盘星),这将使它更容易(和鲁棒性)从观测到的恒星光谱中推断出我们在同一点观测到的每个恒星家族的恒星的平均年龄和化学含量。绘制ETG褪色恒星盘的恒星年龄已经可以告诉我们导致星星形成停止的过程,因为一些过程会随着距离星系中心的距离而留下不同的年龄趋势。

项目成果

期刊论文数量(10)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
The Fornax 3D project: Globular clusters tracing kinematics and metallicities
  • DOI:
    10.1051/0004-6361/202037685
  • 发表时间:
    2020-03
  • 期刊:
  • 影响因子:
    6.5
  • 作者:
    K. Fahrion;M. Lyubenova;M. Hilker;G. Ven;J. Falc'on-Barroso;Robert Leaman;I. Mart'in-Navarro;A. Bittner;L. Coccato;E. Corsini;D. Gadotti;E. Iodice;R. McDermid;F. Pinna;M. Sarzi;S. Viaene;P. Zeeuw;L. Zhu
  • 通讯作者:
    K. Fahrion;M. Lyubenova;M. Hilker;G. Ven;J. Falc'on-Barroso;Robert Leaman;I. Mart'in-Navarro;A. Bittner;L. Coccato;E. Corsini;D. Gadotti;E. Iodice;R. McDermid;F. Pinna;M. Sarzi;S. Viaene;P. Zeeuw;L. Zhu
The survival of stellar discs in Fornax-like environments, from TNG50 to real galaxies
恒星盘在类似 Fornax 的环境中的生存,从 TNG50 到真实的星系
The fragility of thin discs in galaxies - I. Building tailored N -body galaxy models
星系中薄盘的脆弱性 - I. 构建定制的 N 体星系模型
The Fornax3D project: Environmental effects on the assembly of dynamically cold disks in Fornax cluster galaxies
Fornax3D 项目:环境对 Fornax 星团星系中动态冷盘组装的影响
  • DOI:
    10.48550/arxiv.2301.05532
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Ding Y.
  • 通讯作者:
    Ding Y.
The MeerKAT Fornax Survey II. The rapid removal of HI from dwarf galaxies in the Fornax cluster
MeerKAT Fornax 调查 II。
  • DOI:
    10.48550/arxiv.2305.13163
  • 发表时间:
    2023
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Kleiner D
  • 通讯作者:
    Kleiner D
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Marc Sarzi其他文献

How black holes restrain old galaxies
黑洞如何抑制古老星系
  • DOI:
    10.1038/533473a
  • 发表时间:
    2016-05-25
  • 期刊:
  • 影响因子:
    48.500
  • 作者:
    Marc Sarzi
  • 通讯作者:
    Marc Sarzi
Morphology and kinematics of the ionised gas in early-type galaxies
  • DOI:
    10.1016/j.newar.2005.10.006
  • 发表时间:
    2006-01-01
  • 期刊:
  • 影响因子:
  • 作者:
    Jesús Falcón-Barroso;Marc Sarzi;Roland Bacon;Martin Bureau;Michele Cappellari;Roger L. Davies;Eric Emsellem;Kambiz Fathi;Davor Krajnović;Harald Kuntschner;Richard M. McDermid;Reynier F. Peletier;Tim de Zeeuw
  • 通讯作者:
    Tim de Zeeuw

Marc Sarzi的其他文献

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{{ truncateString('Marc Sarzi', 18)}}的其他基金

Bring Science to your Home with Armagh Observatory and Planetarium
阿马天文台和天文馆将科学带入您的家
  • 批准号:
    ST/V002198/1
  • 财政年份:
    2020
  • 资助金额:
    $ 22.18万
  • 项目类别:
    Research Grant
A Stargazing Opportunity for Half of England's Pupils
一半英格兰学生的观星机会
  • 批准号:
    ST/M001857/1
  • 财政年份:
    2014
  • 资助金额:
    $ 22.18万
  • 项目类别:
    Fellowship
Supermassive black holes and nuclear stellar disks, nuclear keys to galaxy formation and evolution
超大质量黑洞和核星盘,星系形成和演化的核关键
  • 批准号:
    ST/F009186/1
  • 财政年份:
    2008
  • 资助金额:
    $ 22.18万
  • 项目类别:
    Fellowship

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