Collaborative Research: Expanding the Dynamical Map of the Milky Way with Asteroseismic Distances

合作研究：用星震距离扩展银河系动态图

• 批准号: 2007232
• 负责人: Robyn Sanderson
• 金额: $ 20.23万
• 依托单位: University of Pennsylvania
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-08-15 至 2024-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2007232&HistoricalAwards=false
• 关键词: Collaborative; Research; Expanding; Dynamical; Map

The investigators will explore the structure of our Milky Way galaxy by measuring the distances to stars using a novel technique called Asteroseismology, which is the study of oscillations in stars. Oscillations are measured by rapid observations of the changes in the brightness and motions of the star’s surface. The investigators will use ground-based telescopes to measure brightness variations in hundreds of thousands of distant stars to infer their distances. These will then be used to create the largest 3D map ever constructed of the outer regions of the Milky Way, enabling insights into how our galaxy has formed and changed over time. The results will help place the Milky Way in the context of other galaxies, leading to a more complete understanding of the origin of our Universe. The investigators will also host a summer research experience for native Hawaiian college students, with the goal of increasing their representation in STEM at the graduate level.Galactic astronomy has entered a golden era, driven by the combination of large-scale multi-object spectroscopic surveys and the exquisite all-sky view provided by the European Space Agency’s Gaia Mission. However, the range of Gaia distances alone—and hence that of many of the major discoveries so far—is limited to a relatively nearby region (3 kpc from the Sun). A solution to this problem is the use of ground-based transient surveys, such as the NSF supported Zwicky Transient Factory (ZTF), which have expanded into all-sky networks hunting for rapid explosive phenomena such as supernovae and electromagnetic counterparts to compact binary mergers. The investigators will use asteroseismology to measure distances to a special type of star, M red giant stars, in the outer Galaxy using stellar light curves from these ongoing surveys. The investigators will exploit the synergy of Gaia with time-domain surveys and spectroscopic surveys to expand the dynamical map of our Galaxy by more than an order of magnitude over Gaia alone. By combining the star distance measurements with synthetic observations of their simulations, the investigators will use the new dynamical map to unveil the structure, dynamics, and formation history of the outer Galactic disk.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

研究人员将通过使用一种称为星震学的新技术测量到恒星的距离来探索银河系的结构，该技术是通过快速观察恒星的亮度和运动的变化来研究恒星的振荡。研究人员将使用地面望远镜测量数十万颗遥远恒星的亮度变化，以推断它们的距离，然后将这些数据用于创建有史以来最大的外部区域 3D 地图。银河系的形成和变化，这些结果将有助于将银河系置于其他星系的背景下，从而更全面地了解我们宇宙的起源。为夏威夷本土大学生举办暑期研究体验活动，目标是提高他们在研究生阶段 STEM 的代表性。在大规模多目标光谱调查和精致的全光谱观测相结合的推动下，银河天文学已经进入了黄金时代。 - 天空视图由然而，仅盖亚距离的范围（以及迄今为止的许多重大发现的范围）仅限于相对较近的区域（距离太阳 3 kpc）。使用地面瞬态调查，例如美国国家科学基金会支持的兹威基瞬态工厂（ZTF），该工厂已扩展到全天网络，寻找超新星和电磁单元等快速爆炸现象，以压缩双星合并。星震学利用这些正在进行的勘测中的恒星光曲线来测量到外星系中一种特殊类型的恒星——M红巨星的距离。研究人员将利用盖亚与时域勘测和光谱勘测的协同作用来扩展动态图。通过将恒星距离测量与模拟的综合观测相结合，研究人员将使用新的动力学图来揭示银河系外层的结构、动力学和形成历史。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

On the Stability of Tidal Streams in Action Space

论作用空间潮汐流的稳定性

• DOI: 10.3847/1538-4357/ac93fb
• 发表时间: 2022-10
• 期刊: The Astrophysical Journal
• 作者: Arora, Arpit;Sanderson, Robyn E.;Panithanpaisal, Nondh;Cunningham, Emily C.;Wetzel, Andrew;Garavito
• 通讯作者: Garavito

The dark side of FIRE: predicting the population of dark matter subhaloes around Milky Way-mass galaxies

火的黑暗面：预测银河系质量星系周围暗物质亚晕的数量

• DOI: 10.1093/mnras/stad1395
• 发表时间: 2023-05
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Barry, Megan;Wetzel, Andrew;Chapman, Sierra;Samuel, Jenna;Sanderson, Robyn;Arora, Arpit
• 通讯作者: Arora, Arpit

The Relationship between Age, Metallicity, and Abundances for Disk Stars in a Simulated Milky Way

模拟银河系中盘状恒星的年龄、金属丰度和丰度之间的关系

• DOI: 10.3847/1538-4357/aca1c7
• 发表时间: 2022-04-24
• 期刊: The Astrophysical Journal
• 作者: A. Carrillo;M. Ness;K. Hawkins;R. S;erson;erson;Kaile Wang;A. Wetzel;Matthew A. Bellardini
• 通讯作者: Matthew A. Bellardini

Kinematics and Metallicity of Red Giant Branch Stars in the Northeast Shelf of M31*

M31 东北架红巨星分支星的运动学和金属丰度*

• DOI: 10.3847/1538-3881/ac7146
• 发表时间: 2022-06
• 期刊: The Astronomical Journal
• 作者: Escala, Ivanna;Gilbert, Karoline M.;Fardal, Mark;Guhathakurta, Puragra;Sanderson, Robyn E.;Kalirai, Jason S.;Mobasher, Bahram
• 通讯作者: Mobasher, Bahram

Streams on FIRE: Populations of Detectable Stellar Streams in the Milky Way and FIRE

火流：银河系中可探测的恒星流群和火

• DOI: 10.3847/1538-4357/acc582
• 发表时间: 2022-08-03
• 期刊: The Astrophysical Journal
• 作者: N. Shipp;N. Panithanpaisal;L. Necib;R. S;erson;erson;D. Erkal;Ting S. Li;I. Santistevan;A. Wetzel;L. Cullinane;A. Ji;Sergey E. Koposov;K. Kuehn;G. Lewis;A. Pace;D. Zucker;J. Bl;E. Cunningham;Stacy Y. Kim;Sophia Lilleengen;J. Moreno;Sanjib Sharma
• 通讯作者: Sanjib Sharma