旧版网站 台内地址簿 网站地图 联系我们 English 中国科学院
首页紫台简介机构设置新闻动态科研成果研究队伍合作交流天文学院创新文化党群园地信息公开
新闻动态
图片新闻
综合新闻
天文快讯
Colloquium & 学术交流
国内外天文学术会议
紫台通讯
传媒扫描
科普动态
科研信息
台内新闻
您当前的位置:首页>新闻动态>Colloquium & 学术交流
4月10日 KROSS: The KMOS Redshift One Spectroscopic Survey
2017年04月05日

  Title: KROSS: The KMOS Redshift One Spectroscopic Survey

  Speaker:Prof. Martin Bureau (University of Oxford)

  Short biographical introduction:

  Martin Bureau is a self-described galaxy guru, with an interest in anything and everything galactic. He is particularly interested in using observations and theoretical studies of the gas, stars, and dark matter that make up galaxies to constrain their formation and evolution.

  Martin is Professor of Astrophysics at the University of Oxford, and Lindemann Fellow and Tutor in Physics at Wadham College. He has been in Oxford for over a decade, following appointments at Columbia University as a NASA Hubble Fellow and at Leiden University. He obtained his PhD from The Australian National University and is originally from Montreal, Canada.

  Abstract:I will present results from the KMOS Redshift One Spectroscopic Survey (KROSS). Using the K-band Multi-object Spectrograph (KMOS) at the Very Large Telescope (VLT), KROSS has gathered integral-field data for ~800 star-forming galaxies at a redshift z~1, when the universe was roughly half its current age and forming the bulk of its stars. KROSS aims to study the spatially-resolved dynamics, star formation properties and metallicities of those middle-aged galaxies. First, I will quantify the dynamical state of the galaxies, thus constraining their likely mass growth mechanisms (e.g. mergers versus secular evolution), painting a picture of galaxies that are both gas-rich and highly turbulent. Second, I will describe the properties of the galaxies departing from the star formation main sequence, revealing that star formation in highly star-forming galaxies is also more concentrated and arises from lower metallicity gas. Third, I will present the observed and baryonic Tully-Fisher (luminosity - rotation velocity) relation, thus constraining the mass-to-light ratios and luminous+dark masses of the galaxies. Last, by degrading and analogously analysing integral-field data of hundreds of local galaxies from the Sydney-AAO Multi-object Integral-field Spectrograph (SAMI) survey, I will derive a comparison Tully-Fisher relation at z=0, thus constraining the luminous+dark mass growth of disk galaxies over the last 7 billions years. This unique comparison also highlights that the systematic effects associated with sample selection and analysis methods are as large as the effects expected from cosmological evolution, and thus that most other results can safely be ignored.

  Time:10 April (Monday), 10:00am

  Place:402 Room, Astronomy Building

欢迎各位老师、同学参加!

                                             南京大学天文与空间科学学院

地址:(210008)南京市北京西路2号 电话:86-25-83332000 传真:86-25-83332091 Email:pmoo@pmo.ac.cn
版权所有:中国科学院紫金山天文台    http://www.pmo.cas.cn    备案序号:苏ICP备05007736号