Collaborative Research: Exploring the Dark Side of NGC 5128

合作研究：探索 NGC 5128 的黑暗面

• 批准号: 1813708
• 负责人: David Sand
• 金额: $ 25.55万
• 依托单位: University of Arizona
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-15 至 2023-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1813708&HistoricalAwards=false
• 关键词: Collaborative; Research; Exploring; Dark; Side

The investigators will study the outskirts of the nearest giant elliptical galaxy, named Centaurus A, to learn how the galaxy built up its stellar and dark matter mass over cosmic time. The investigators have measured the positions of nearly all the luminous star clusters associated with Centaurus A, and will precisely measure their velocities using large ground-based telescopes. Using observations of the collection of star clusters, and their motions around Centaurus A, the investigators will measure the dark matter density profile of the galaxy, and search for remnants of smaller galaxies that have merged with Centaurus A. The important goal of their observations is identifying large star clusters which are the remnants left over from smaller galaxies after they have been devoured by the larger Centaurus A. By studying the motions of these star clusters in detail, along with the smaller galaxies it has destroyed, they will have a complete inventory of the 'dark side' of Centaurus A. Their results will be applied to studies of all galaxy populations. The investigators will present the science results from this program to visitors at the National Science Foundation's Kitt Peak National Observatory, by implementing a new docent training program at the visitor center. The investigators will travel to Bryce Canyon National Park and present their results, through summer internships, which ultimately teach 16,000 visitors about the night sky.The currently favored cold dark matter model makes clear predictions for the sub-halo mass function and dark matter density profile of galaxy-sized halos, but quantitatively verifying these predictions is challenging. Centaurus A's dark matter density profile will be measured, using the kinematics derived from a nearly complete sample of star clusters, and the results compared to recent simulations that suggest galaxies with recent mergers and active galactic nuclei should have shallow dark matter profiles. By combining the star cluster kinematics with an already existing red giant branch star map, the visible, accreted substructures will be identified and weighed. Finally, a complete sample of ultra-compact dwarfs will be analyzed, including a search identifying them as the central compact remnants of stripped dwarf galaxies. Accounting for this population of sub-halos is a novel aspect of this program, and one that has largely been neglected when testing galaxy formation models. These efforts will test major predictions of the cold dark matter model at sub-galactic scales in our nearest elliptical galaxy neighbor.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.

调查人员将研究最近的巨型椭圆星系（Centaurus a）的郊区，以了解银河系如何在宇宙时间内建立其恒星和暗物质质量。 研究人员已经测量了几乎所有与Centaurus A相关的发光星团的位置，并将使用大型地面望远镜精确测量其速度。 利用观察到恒星簇的收集及其周围的动作，调查人员将衡量星系的暗物质密度特征，并寻找与Centaurus A合并的较小星系的残余物，其观察到的重要目标是确定大型恒星丛中的大型恒星丛中的较小的剩余的较小的星系。除了破坏的较小的星系外，它们还将完全清点Centairus A的“黑暗面”。它们的结果将应用于所有星系人群的研究。 调查人员将通过在访客中心实施新的讲师培训计划，向国家科学基金会国家科学峰国家观测站的访客介绍该计划的科学结果。 调查人员将通过暑期实习来前往布莱斯峡谷国家公园，并通过夏季实习来展示其结果，该实习最终向16,000个访客传授了有关夜空的信息。目前受到青睐的冷暗物质模型可以清楚地预测星系大小的晕圈的次山质量质量功能和暗物质密度概况，但定量验证这些预测是有挑战性的。 使用近乎完整的恒星簇样品得出的运动学，将测量Centaurus A的暗物质密度曲线，并且与最近的模拟相比，结果表明与最近合并的星系和活跃的银河系核应该具有浅暗物质曲线。 通过将Star群集运动学与已经存在的红色巨型分支星图相结合，将确定并称重可见的，积聚的子结构。 最后，将分析一个超紧凑型矮人的完整样本，包括搜索将它们识别为剥离矮星系中的中央紧凑型残留物。 占该次级山lo的人群是该计划的一个新方面，并且在测试星系形成模型时已被忽略了。 这些努力将在我们最近的椭圆星系邻居中测试对酸性尺度的冷暗物质模型的重大预测。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，认为值得通过评估值得支持。

项目成果

The Faint End of the Centaurus A Satellite Luminosity Function

• DOI: 10.3847/1538-4357/aafbe7
• 发表时间: 2018-09
• 期刊: The Astrophysical Journal
• 作者: D. Crnojevi'c;D. Sand;P. Bennet;S. Pasetto;K. Spekkens;N. Caldwell;P. Guhathakurta;B. McLeod;A. Seth;J. Simon;J. Strader;E. T. U. O. Tampa;Tâmpa;Fl;USA.;D. PhysicsAstronomy;Texas Tech University;Lubbock;Tx;D. O. Astronomy;S. Observatory;U. Arizona;Tucson;Az;Observatories of the Carnegie Institution for Science-Observatories-of-the-Carnegie-Institution-for-102557742;Pasadena;Ca;Department of Materials Science;Royal Military College of Canada;Kingston;Ontario;Canada;H. C. F. Astrophysics;Cambridge;Ma;D. O. AstronomyAstrophysics;University of California at Santa Cruz;D. Physics;Astronomy;U. Utah;Salt lake City;Ut;M. University;E. Lansing.;Mi;U. Pacific;Stockton

Mapping Dark Matter with Extragalactic Stellar Streams: The Case of Centaurus A

用河外恒星流绘制暗物质图：半人马座 A 的案例

• DOI: 10.3847/1538-4357/ac9bfb
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: Pearson, Sarah;Price-Whelan, Adrian M.;Hogg, David W.;Seth, Anil C.;Sand, David J.;Hunt, Jason A.;Crnojević, Denija
• 通讯作者: Crnojević, Denija

Resolved Dwarf Galaxy Searches within ∼5 Mpc with the Vera Rubin Observatory and Subaru Hyper Suprime-Cam*

使用 Vera Rubin 天文台和 Subaru Hyper Suprime-Cam* 解决了 â⁄5 Mpc 内的矮星系搜索问题*

• DOI: 10.3847/1538-4357/ac0db8
• 发表时间: 2021
• 期刊: The Astrophysical Journal
• 作者: Mutlu-Pakdil, Burçin;Sand, David J.;Crnojević, Denija;Drlica-Wagner, Alex;Caldwell, Nelson;Guhathakurta, Puragra;Seth, Anil C.;Simon, Joshua D.;Strader, Jay;Toloba, Elisa
• 通讯作者: Toloba, Elisa