Post-Starbursts as Laboratories: Probing Star Formation Quenching and Late Phases of Stellar Evolution with NIRWALS

后星暴实验室:用 NIRWALS 探测恒星形成淬灭和恒星演化的后期阶段

基本信息

  • 批准号:
    2307082
  • 负责人:
  • 金额:
    $ 65.51万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2023
  • 资助国家:
    美国
  • 起止时间:
    2023-09-01 至 2026-08-31
  • 项目状态:
    未结题

项目摘要

Galaxies can be thought of as star forming "factories," where various processes (e.g., density waves, tidal forces, mergers, gas inflows) act to create regions of dense, gravitationally unstable gas, which subsequently fragment and collapse into stars. Depending on the specific process involved, this could result in a fairly constant star formation rate (SFR) or in an intense but short- lived episode, largely confined to the galaxy's nucleus and often accompanied by gas accreting onto a supermassive blackhole. Starburst galaxies are examples of the latter. In extreme cases the starburst is followed by a lengthy 'post-starburst' phase in which star formation is largely extinguished or 'quenched.' The principal investigator (PI) will lead a team investigating this quenching in a large sample of local post-starburst galaxies using a near-infrared (NIR) integral field spectrograph. Improved stellar evolution models will also be tested. The proposed work will also provide research experience and training for undergraduate students, provide material for a PhD thesis, and deliver a large astronomical dataset to the public domain. The team will observe a sample of 50 post-starburst galaxies using a new NIR integral-field spectrograph (NIRWALS) on the 11-meter Southern African Large Telescope (SALT). A key question is whether star formation quenching is caused by a lowered SFE or if it is caused by the violent blow-out of gas by supernova and/or or accreting supermassive blackholes. NIR hydrogen Paschen emission lines will be used to measure accurate star formation rates, with SFE estimated in combination with existing CO data. NIR emission lines of helium, sulfur, and iron will be used to reveal shocked gas and to determine if central supermassive blackholes actively inject energy into the gas. The team will compare post-starburst galaxies’ starlight to predictions of new stellar evolutionary synthesis models. These models include improved treatment of the late stages of stellar evolution that dominate the NIR emission of stellar populations between 0.5 to 2 billion years old (roughly the post-burst age of the observed galaxies). Correctly calibrating these models is critical for understanding the build-up of stellar mass in galaxies over cosmic time.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.
星系可以被认为是恒星形成的“工厂”,各种过程(例如,密度波、潮汐力量、合并、气体流入)作用于产生致密的、重力不稳定的气体区域,这些气体随后碎裂并坍塌成恒星。根据所涉及的具体过程,这可能会导致相当恒定的恒星形成率(SFR),或者导致一个强烈但短暂的插曲,主要局限于星系核,并经常伴随着气体吸积到超大质量黑洞上。星爆星系就是后者的例子。在极端情况下,恒星爆发之后会有一个漫长的“后恒星爆发”阶段,在这个阶段,恒星的形成基本上会熄灭或“熄灭”。首席研究员(PI)将带领一个团队使用近红外(NIR)积分场光谱仪在大样本的星暴后局部星系中调查这种猝灭。改进的恒星演化模型也将得到测试。拟议的工作还将为本科生提供研究经验和培训,为博士论文提供材料,并向公共领域提供大型天文数据集。该团队将使用11米长的南部非洲大望远镜(SALT)上的新型近红外积分场光谱仪(NIRWALS)观测50个恒星爆炸后星系的样本。一个关键的问题是,恒星形成猝灭是由SFE降低引起的,还是由超新星和/或吸积超大质量黑洞的气体猛烈喷发造成的。近红外氢帕钦发射线将被用来测量准确的恒星形成速率,并结合现有的CO数据估计SFE。氦、硫和铁的近红外发射线将被用来揭示受冲击的气体,并确定中央超大质量黑洞是否主动向气体注入能量。该团队将把恒星爆炸后星系的星光与新的恒星演化合成模型的预测进行比较。这些模型包括改进了对恒星演化后期阶段的处理,这些阶段主导着年龄在0.5到20亿年(大致是观测到的星系爆发后的年龄)的恒星群体的近红外辐射。正确校准这些模型对于理解星系中恒星质量在宇宙时间内的积累至关重要。这一奖项反映了美国国家科学基金会的法定使命,并通过使用基金会的智力优势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

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Christy Tremonti其他文献

Christy Tremonti的其他文献

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{{ truncateString('Christy Tremonti', 18)}}的其他基金

Collaborative Research: Absorption and Emission Line Probes of Galactic Winds with eBOSS
合作研究:利用 eBOSS 进行银河风的吸收和发射线探测
  • 批准号:
    2107725
  • 财政年份:
    2021
  • 资助金额:
    $ 65.51万
  • 项目类别:
    Standard Grant
Collaborative Research: Extreme Starbursts and Outflows: The Formation of Massive Compact Galaxies
合作研究:极端星暴和外流:大质量致密星系的形成
  • 批准号:
    1813365
  • 财政年份:
    2018
  • 资助金额:
    $ 65.51万
  • 项目类别:
    Standard Grant
CAREER: Constraining the Chemical Evolution of Galaxies with MaNGA
职业:用 MaNGA 约束星系的化学演化
  • 批准号:
    1554877
  • 财政年份:
    2016
  • 资助金额:
    $ 65.51万
  • 项目类别:
    Standard Grant
Mapping the Chemical Evolution of Disk Galaxies with MaNGA
用 MaNGA 绘制盘状星系的化学演化图
  • 批准号:
    1412287
  • 财政年份:
    2014
  • 资助金额:
    $ 65.51万
  • 项目类别:
    Standard Grant
New Constraints on Feedback from a Comprehensive Study of Galactic Winds
银河风综合研究反馈的新限制
  • 批准号:
    0907839
  • 财政年份:
    2009
  • 资助金额:
    $ 65.51万
  • 项目类别:
    Standard Grant

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  • 批准号:
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Collaborative Research: The Emergence of Dusty Starbursts in Cosmic History
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    Standard Grant
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  • 批准号:
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    2023
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    Standard Grant
The Inner Workings of Starbursts and Their Winds
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  • 批准号:
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Collaborative Research: Extreme Starbursts and Outflows: The Formation of Massive Compact Galaxies
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  • 批准号:
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    $ 65.51万
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合作研究:极端星暴和外流:大质量致密星系的形成
  • 批准号:
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合作研究:极端星暴和外流:大质量致密星系的形成
  • 批准号:
    1814159
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The Morphology of Dust-Obscured Starbursts: the e-MERLIN SuperCLASS Legacy Survey
尘埃遮蔽星暴的形态:e-MERLIN SuperCLASS 遗产调查
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