Radio Emission from Intermediate Mass Black Holes: Evolution with Accretion Rate

中等质量黑洞的无线电发射：吸积率的演化

• 批准号: 2206123
• 负责人: Richard Plotkin
• 金额: $ 32.33万
• 依托单位: Board of Regents, NSHE, obo University of Nevada, Reno
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2206123&HistoricalAwards=false
• 关键词: Radio; Emission; Intermediate; Mass; Black

Black holes are ubiquitous in the universe and have a wide range of masses. Some black holes are a few times more massive than the sun and are formed when the core of a massive star collapses at the end of its life. Other black holes are found in the centers of galaxies. These are typically millions or hundreds of millions times more massive than the sun and are known as Super Massive Black Holes (SMBHs). A team from the University of Nevada, Reno, will better understand the growth of SMBH by studying black holes that have masses intermediate between stellar and SMBHs. These Intermediate Mass Black Holes (IMBHs) are crucial because it is thought that IMBH grow into SMBH either by merging with other black holes or accreting material - dust, gas, and stars - in their immediate vicinity. Specifically, the team will investigate how the the radio emission differs in IMBHs that are accreting slowly vs. those that are rapidly accreting. The team will work with local education organizations to develop outreach materials for K-12 schools. The outreach materials will be based on student observations with the Great Basin Observatory, an 0.7m robotic telescope in eastern Nevada. In addition, two graduate students will be trained in radio interferometry techniques. This project is jointly funded by NSF AST and by the Established Program to Stimulate Competitive Research (EPSCoR). In this project, the team will scrutinize radio emission from IMBHs. Using radio data from the Karl G Jansky Very Large Array, in conjunction with existing multiwavelength information, they will: (1) Reveal the accretion state and radio emission mechanisms of rapidly accreting IMBHs (Eddington ratios 1%). (2) Determine if weakly accreting IMBHs (Eddington ratios 1%) launch radio jets with radiative powers matching current expectations, to validate current radio-based IMBH selection techniques. (3) Compare radio emission between the rapid and weak accretion regimes to investigate if IMBHs follow similar patterns as their lower- and higher-mass cousins (i.e., stellar and SMBH, respectively).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.

黑洞在宇宙中无处不在，质量范围很广。有些黑洞的质量比太阳大几倍，是大质量星星的核心在其生命结束时坍缩而形成的。其他的黑洞在星系的中心被发现。这些黑洞通常比太阳大数百万或数亿倍，被称为超大质量黑洞（SMBH）。来自内华达州里诺大学的一个研究小组将通过研究质量介于恒星和SMBH之间的黑洞来更好地了解SMBH的增长。这些中等质量黑洞（IMBH）是至关重要的，因为人们认为IMBH要么通过与其他黑洞合并，要么通过在其附近吸积物质-尘埃，气体和恒星-成长为SMBH。具体来说，该团队将研究缓慢吸积的IMBH与快速吸积的IMBH的无线电发射有何不同。该团队将与当地教育组织合作，为K-12学校开发宣传材料。外展材料将基于学生对大盆地天文台的观测，大盆地天文台是内华达州东部的一个0.7米机器人望远镜。此外，两名研究生将接受无线电干涉测量技术培训。该项目由NSF AST和刺激竞争研究的既定计划（EPSCoR）共同资助。在这个项目中，该团队将仔细检查IMBH的无线电发射。利用Karl G Jansky甚大阵的射电数据，结合现有的多波长信息，他们将：（1）揭示快速吸积IMBH（爱丁顿比1%）的吸积状态和射电发射机制。(2)确定弱吸积IMBH（埃丁顿比率1%）是否发射辐射功率符合当前预期的射电喷流，以验证当前基于射电的IMBH选择技术。(3)比较快速和弱吸积状态之间的无线电发射，以调查IMBH是否遵循与它们的低质量和高质量表亲相似的模式（即，该奖项反映了NSF的法定使命，并通过使用基金会的知识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

Multiwavelength scrutiny of X-ray sources in dwarf galaxies: ULXs versus AGNs

矮星系中 X 射线源的多波长研究：ULX 与 AGN

• DOI: 10.1093/mnras/stad002
• 发表时间: 2023
• 期刊: Monthly Notices of the Royal Astronomical Society
• 影响因子: 4.8
• 作者: Thygesen, Erica;Plotkin, Richard M.;Soria, Roberto;Reines, Amy E.;Greene, Jenny E.;Anderson, Gemma E.;Baldassare, Vivienne F.;Owens, Milo G.;Urquhart, Ryan T.;Gallo, Elena
• 通讯作者: Gallo, Elena