Kinematics and Abundances of the Galactic and M31 Bulges

银河系和 M31 核球的运动学和丰度

基本信息

  • 批准号:
    0709479
  • 负责人:
  • 金额:
    $ 46.7万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Continuing Grant
  • 财政年份:
    2007
  • 资助国家:
    美国
  • 起止时间:
    2007-07-01 至 2012-06-30
  • 项目状态:
    已结题

项目摘要

Dr. R. Michael Rich, of the University of California - Los Angeles, will undertake a large scale radial velocity study of the Galactic bulge using M giants selected from the Two Micron All-sky Imaging Survey (2MASS) and observed using the Hydra multifiber spectrograph at Cerro Tololo Inter-American Observatory. The investigator has shown that the M giants make excellent kinematic probes that can be studied over the entirety of the Galactic bulge, even in high extinction regions; the ultimate sample of 10,000 radial velocities is a factor of ten greater than previous studies. Dr. Rich has developed techniques that give a precision of 3 km/s for radial velocity measurements, making it possible to discover cold kinematic features in the bulge, if present. Comparison of the resulting longitude-velocity diagrams, minor axis rotation curves, and other velocity data with self-consistent models of the Galactic bulge/bar, will allow for insight into the formation of the Galactic bulge. In addition, Dr. Rich will obtain detailed abundances for stars in the bulges of the Milky Way and M31 using infrared spectroscopy. For the Milky Way bulge, he will observe at least 150 stars ranging from 30 to 300 pc from the nucleus using the NIRSPEC echelle spectrograph at the Keck observatory. This program will extend detailed abundance measurements into regions of the Galaxy that are near the nucleus and are obscured by dust. The presence or absence of an abundance gradient constrains models of secular evolution of the bar, while measurements of composition (e.g. oxygen abundance) can constrain the formation timescale and the initial mass function of the primordial stellar population.Dr. Rich will contribute to the training of the next generation of astronomers by supporting a Ph.D. student whose thesis is in progress and also research by an undergraduate student and a postdoctoral scientist through this program. The Galactic bulge radial velocity survey and the resulting models will be made available to the Hayden Planetarium, which is building a virtual Milky Way Galaxy that can be observed by the public in a simulated fly-through, and he will explore other visualizations of the data to bring the results to the public. The entire database of ~10,000 stars with spectroscopy and radial velocities will be made available to the astronomical community.
加州大学洛杉矶分校的R. Michael Rich博士将对银河系凸起进行大规模的径向速度研究,使用从2微米全天成像调查(2MASS)中选择的M巨星,并使用Cerro Tololo美洲天文台的Hydra多光纤光谱仪进行观测。研究人员已经证明,M巨星是非常好的运动学探测器,可以在整个银河系凸起的区域进行研究,即使是在高灭绝区域;10,000径向速度的最终样本比以前的研究大了十倍。里奇博士开发了一种技术,可以精确到3公里/秒的径向速度测量,如果存在的话,可以发现凸起的冷运动特征。将得到的经度-速度图、小轴旋转曲线和其他速度数据与银河系凸起/棒状星系的自洽模型进行比较,将有助于深入了解银河系凸起的形成。此外,里奇博士还将利用红外光谱技术获得银河系和M31凸起处恒星的详细丰度。对于银河系凸起,他将使用凯克天文台的NIRSPEC梯级光谱仪观察至少150颗恒星,距离核心从30到300 pc不等。这个项目将把详细的丰度测量扩展到银河系靠近核心、被尘埃遮蔽的区域。丰度梯度的存在与否限制了棒状星系长期演化的模型,而成分(如氧丰度)的测量可以限制形成的时间尺度和原始恒星群的初始质量函数。里奇将通过支持一名正在进行论文的博士生,以及一名本科生和一名博士后科学家通过该项目进行的研究,为培养下一代天文学家做出贡献。银河系膨胀径向速度调查和由此产生的模型将提供给海登天文馆,该天文馆正在建立一个虚拟的银河系,公众可以在模拟飞行中观察到,他将探索数据的其他可视化方式,将结果带给公众。大约10000颗恒星的光谱和径向速度的整个数据库将提供给天文学界。

项目成果

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Robert Rich其他文献

Federal Reserve Bank of New York Staff Reports Inflation Expectations and Behavior: Do Survey Respondents Act on Their Beliefs? Inflation Expectations and Behavior: Do Survey Respondents Act on Their Beliefs?
纽约联邦储备银行工作人员报告通胀预期和行为:调查受访者是否按照自己的信念行事?
  • DOI:
  • 发表时间:
    2011
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Olivier Armantier;W. Bruine de Bruin;Giorgio Topa;Wilbert van der Klaauw;basit. zafar;York Bruine De Bruin;Michael Bryan;J. Dominitz;Julie S. Downs;Baruch Fischhoff;Charlie Holt;Eric Johnson;A. Kennickell;Charles F. Manski;Athanasios Orphanides;Onur Ozgur;Simon Potter;Robert Rich;Ken Wolpin;Sandy Chien;Tim Colvin;Peter Fielding;Daniel Forman;Daniel L Greenwald;Tanya Gutsche;Mandy B. Holbrook;Scott Nelson;B. Weerman
  • 通讯作者:
    B. Weerman
Federal Reserve Bank of New York Staff Reports the Relationship between Expected Inflation, Disagreement, and Uncertainty: Evidence from Matched Point and Density Forecasts the Relationship between Expected Inflation, Disagreement, and Uncertainty: Evidence from Matched Point and Density Forecasts
纽约联邦储备银行工作人员报告预期通胀、分歧和不确定性之间的关系:来自匹配点和密度预测的证据 预期通胀、分歧和不确定性之间的关系:来自匹配点和密度预测的证据
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
    Robert Rich;Joseph Tracy;Timothy Cogley;John Ham;B. Hobijn;John Leahy;Jose Lopez;Simon Potter;Til Schuermann;Tom Stark;Giorgio
  • 通讯作者:
    Giorgio
Indirect consumer inflation expectations: Theory and evidence
间接消费者通胀预期:理论与证据
  • DOI:
    10.1016/j.jmoneco.2024.103568
  • 发表时间:
    2024-07-01
  • 期刊:
  • 影响因子:
    4.100
  • 作者:
    Ina Hajdini;Edward S. Knotek;John Leer;Mathieu Pedemonte;Robert Rich;Raphael Schoenle
  • 通讯作者:
    Raphael Schoenle

Robert Rich的其他文献

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{{ truncateString('Robert Rich', 18)}}的其他基金

Collaborative Research:A Panchromatic Imaging Survey of the Galactic Bulge
合作研究:银河系核球的全色成像调查
  • 批准号:
    1413755
  • 财政年份:
    2014
  • 资助金额:
    $ 46.7万
  • 项目类别:
    Standard Grant
Composition of Stars in the Galactic Bulge and Inner Disk
银河核球和内盘中恒星的组成
  • 批准号:
    1212095
  • 财政年份:
    2012
  • 资助金额:
    $ 46.7万
  • 项目类别:
    Standard Grant
Collaborative Research: Structure and Evolution of M31's Stellar Halo from a Large-Scale Spectroscopic Survey
合作研究:大规模光谱巡天中 M31 恒星晕的结构和演化
  • 批准号:
    0307931
  • 财政年份:
    2003
  • 资助金额:
    $ 46.7万
  • 项目类别:
    Standard Grant
Collaborative Research: Chemical Composition of the Galactic Bulge
合作研究:银河核球的化学成分
  • 批准号:
    0098739
  • 财政年份:
    2001
  • 资助金额:
    $ 46.7万
  • 项目类别:
    Standard Grant
Abundances and Evolution of Stars in the Bulge of the Galaxy
银河系核球中恒星的丰度和演化
  • 批准号:
    9015827
  • 财政年份:
    1991
  • 资助金额:
    $ 46.7万
  • 项目类别:
    Continuing Grant

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用于银河考古学的红巨星遗迹的化学丰度
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Chemical Abundances of Relic Red Giant Stars for Galactic Archeology
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Chemical Abundances of Relic Red Giant Stars for Galactic Archeology
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EAPSI:银河考古学:银河系光环中的元素丰度
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恒星丰度和银河化学演化的红外光谱研究
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