The Formation and Impact of Nascent Globular Star Clusters

新生球状星团的形成和影响

• 批准号: 1716335
• 负责人: Kelsey Johnson
• 金额: $ 40.41万
• 依托单位: University of Virginia Main Campus
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1716335&HistoricalAwards=false
• 关键词: Formation; Impact; Nascent; Globular; Star

Star formation is one of the most important processes in determining the properties of our Universe. The formation of stars changes galaxies in a variety of ways. For example, the density of massive stars affects how much material in a galaxy is blasted into intergalactic space. The number of massive stars determines the abundance of heavy elements available to form complex molecules, including those that are the basis of life. The mode of star formation that has the strongest impact on its environment takes place in "super star clusters" (SSCs). These super star clusters pack thousands of violent massive stars into small volumes, and these dense regions of massive stars act as bombs in their host galaxies. Over the last few decades we have gained a wealth of knowledge about super star clusters. For example, it is now known that super star clusters were formed in large numbers at early times in the Universe. It is also known that ancient super star clusters (called "globular clusters") are present in great numbers in the Universe today. However, it is not yet known how these clusters form. Nor is it known how their properties depend on the environment they are born in. This project will use new capabilities of the Atacama Large Millimeter/submillimeter Array (ALMA) and NSF's Very Large Array to advance our knowledge. Observations with these facilities will enable the investigation of the environments in which super star cluster are formed. The investigator will expand her education and outreach program, called "Dark Skies, Bright Kids." The investigator will extend the program to rural communities in Southern Virginia.Results from ALMA have provided tantalizing clues about the origin of super star clusters, including the first known example of a molecular precursor for such a cluster. Follow-up observations are underway to constrain the physical conditions in the molecular cloud before stars have formed. Additional ALMA observations of nascent SSCs (after the stars have formed) have revealed an apparent trend in molecular line strengths and ratios with respect to the evolutionary state of the cluster. The main scientific goals of this program to be addressed with this program include the following: (1) Identify additional molecular precursors to SSCs (increasing the sample size from one), (2) Constrain the physical environments required to form super star clusters, (3) Quantify the star formation efficiencies of these extreme star-forming regions, and (4) Codify the relationship between molecular line strengths and ratios and cluster dynamics. These results will provide templates to help interpret molecular line ratios from unresolved sources in the more distant universe. The observations at radio, millimeter, and sub-millimeter wavelengths required to address these issues are already obtained, currently underway, and planned for proposals this year.

星星的形成是决定宇宙性质的最重要的过程之一。 恒星的形成以各种方式改变星系。 例如，大质量恒星的密度会影响星系中有多少物质被炸到星系际空间。 大质量恒星的数量决定了可用于形成复杂分子的重元素的丰度，包括那些构成生命基础的重元素。 对环境影响最大的星星形成模式发生在“超级星星团”（SSC）中。 这些超级星星团将数千颗猛烈的大质量恒星包装成小体积，这些大质量恒星的密集区域在其宿主星系中充当炸弹。 在过去的几十年里，我们已经获得了关于超级星星团的丰富知识。 例如，现在已知超级星星团在宇宙早期大量形成。 我们还知道，古代的超级星星星团（称为“球状星团”）在今天的宇宙中数量巨大。 然而，目前还不知道这些集群是如何形成的。 也不知道它们的特性如何取决于它们出生的环境。 该项目将使用阿塔卡马大型毫米/亚毫米阵列（阿尔马）和美国国家科学基金会的超大阵列的新功能，以推进我们的知识。 利用这些设施进行观测将能够调查超级星星团形成的环境。 调查员将扩大她的教育和推广计划，称为“黑暗的天空，光明的孩子。“研究人员将把这个项目扩展到南弗吉尼亚州的农村社区。阿尔马的结果为超级星星团的起源提供了诱人的线索，包括已知的第一个这样的星团分子前体的例子。 后续观测正在进行中，以限制恒星形成前分子云中的物理条件。 额外的阿尔马观察新生的SSC（恒星形成后）揭示了一个明显的趋势，分子线的强度和比率相对于集群的进化状态。 该方案的主要科学目标包括：（1）鉴定SSC的其他分子前体（2）限制形成超级星星团所需的物理环境，（3）量化这些极端恒星形成区的星星形成效率，（4）整理了分子谱线强度和比值与团簇动力学之间的关系。 这些结果将提供模板，以帮助解释分子线比从未解决的来源在更遥远的宇宙。 解决这些问题所需的无线电，毫米和亚毫米波长的观测已经获得，目前正在进行中，并计划在今年提出建议。

项目成果

Dense Molecular Gas in the Nearby Low-metallicity Dwarf Starburst Galaxy IC 10

• DOI: 10.3847/1538-4357/aacaf4
• 发表时间: 2018-06
• 期刊: The Astrophysical Journal
• 作者: A. Kepley;L. Bittle;A. Leroy;M. Jiménez-Donaire;A. Schruba;F. Bigiel;M. Gallagher;Kelsey E. Johnson;A. Usero

New Insights into the Physical Conditions and Internal Structure of a Candidate Proto-globular Cluster

• DOI: 10.3847/1538-4357/ab0d1e
• 发表时间: 2019-03
• 期刊: The Astrophysical Journal
• 作者: Molly K. Finn;Kelsey E. Johnson;C. Brogan;C. Wilson;R. Indebetouw;W. Harris;J. Kamenetzky;A. Bemis

The Association of Molecular Gas and Natal Super Star Clusters in Henize 2–10

Henize 2-10 中分子气体与纳塔尔超级星团的关联

• DOI: 10.3847/1538-4357/aa9ff8
• 发表时间: 2018
• 期刊: The Astrophysical Journal
• 作者: Johnson, Kelsey E.;Brogan, Crystal L.;Indebetouw, Remy;Testi, Leonardo;Wilner, David J.;Reines, Amy E.;Chen, C.-H. Rosie;Vanzi, Leonardo
• 通讯作者: Vanzi, Leonardo

Embedded Young Massive Star Clusters in the Antennae Merger

天线合并中嵌入年轻的大质量星团

• DOI: 10.3847/1538-4357/ac5628
• 发表时间: 2022
• 期刊: The Astrophysical Journal
• 作者: He, Hao;Wilson, Christine;Brunetti, Nathan;Finn, Molly;Bemis, Ashley;Johnson, Kelsey
• 通讯作者: Johnson, Kelsey

Structural and Dynamical Analysis of the Quiescent Molecular Ridge in the Large Magellanic Cloud

大麦哲伦云中静止分子脊的结构和动力学分析

• DOI: 10.3847/1538-3881/ac7aa1
• 发表时间: 2022
• 期刊: The Astronomical Journal
• 作者: Finn, Molly K.;Indebetouw, Remy;Johnson, Kelsey E.;Costa, Allison H.;Chen, C. -H. Rosie;Kawamura, Akiko;Onishi, Toshikazu;Ott, Jürgen;Sewiło, Marta;Tokuda, Kazuki
• 通讯作者: Tokuda, Kazuki