Accretion & Relativistic Jet Physics in Accreting Compact Objects

吸积

• 批准号: RGPIN-2016-06569
• 负责人: Sivakoff, Gregory
• 金额: $ 1.97万
• 依托单位: University of Alberta
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2018
• 资助国家: 加拿大
• 起止时间: 2018-01-01 至 2019-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=665345
• 关键词: Accretion; Relativistic; Jet; Physics; Accreting

The accretion disk process, where matter tends to fall onto an object through a rotating disk, is universal. Astronomers have observed accretion disks in the precursors to stellar systems, around the compact remnants of stars (accreting white dwarfs, neutron stars, and stellar-mass black holes), and at the centres of galaxies with supermassive black holes (active galactic nuclei, AGN). This inflow of material through a disk is also associated with an outflow of material. These outflows can arise as disk-winds, non-relativistic jets, and, in the case of accreting compact objects, relativistic jets. Despite this universality, there are still many open issues in our understanding of accretion and jet physics.***As relativistic jets in AGN are suspected to play an important role in the feedback cycle that links AGN and galaxy formation, the story of disk-jet coupling is likely intertwined with the story of how humans got here. With outburst timescales of ~1–100 Myr, one must study large numbers of AGN to understand the accretion and jet physics that occur during entire outburst cycles. However, stellar-mass accreting compact objects evolve through entire outbursts on timescales of weeks to decades. Studies covering entire outbursts of such objects expand our understanding of the broader field of accretion and jet physics.***My research program focuses on the physics of accretion and relativistic jets, and in particular their connection, in accreting compact objects. I use panchromatic observations of these systems to constrain the physics of accretion and relativistic jets. My long-term goal is to precisely connect the evolution of jet properties with the specific and detailed evolution of spectral and timing properties of the accretion disk across all regimes of accretion. By doing so, I aim to understand accretion and relativistic jet physics sufficiently to precisely determine the role of both stellar-mass and supermassive accreting compact objects in galaxy formation.***My short-term work will connect the evolution of jet properties to specific accretion disk properties using coordinated panchromatic observations of actively accreting stellar-mass black holes as part of a tiered set of projects across international sets of facilities (including National Research Council Canada or Canadian Space Agency co-supported facilities such as the Very Large Array, the Atacama Large Millimeter Array, and the ASTROSAT observatory) and collaborators. To better study accreting stellar-mass black holes and extend my work to other accreting compact objects, I will develop and implement new techniques that take advantage of new observational capacities and rapidly disseminate knowledge of newly discovered accreting compact objects. I will train 4 PhD, 2 MSc, and 5 undergraduate students as part of this Discovery Grant.**

吸积盘过程是普遍存在的，即物质通过旋转盘落到物体上，天文学家在恒星系统的前体中观察到吸积盘，围绕恒星的致密残余物（吸积白矮星、中子星和恒星）。质量黑洞），以及具有超大质量黑洞的星系中心（活动星系核，AGN），这种物质通过盘的流入也与物质的流出有关。这些流出物可以以盘风、非相对论性喷流的形式出现，在吸积致密物体的情况下，可以以相对论性喷流的形式出现。尽管具有这种普遍性，但我们对吸积和喷流物理学的理解仍然存在许多悬而未决的问题。 *由于活动星系核中的相对论性喷流被怀疑在连接活动星系核和星系形成的反馈循环中发挥着重要作用，盘喷流耦合的故事很可能与人类如何到达这里的故事交织在一起。爆发时间尺度约为 1-100 Myr，必须研究大量活动星系核才能了解整个爆发周期中发生的吸积和喷流物理现象。涵盖此类物体的整个爆发扩展了我们对吸积和喷流物理更广泛领域的理解。***我的研究计划重点关注吸积和相对论喷流的物理学，特别是它们的物理连接，在吸积致密物体时，我使用这些系统的全色观测来约束吸积和相对论喷流的物理原理，我的长期目标是将喷流特性的演化与光谱和时间特性的具体而详细的演化精确地联系起来。通过这样做，我的目标是充分了解吸积和相对论喷流物理学，以精确确定星系中恒星质量和超大质量吸积致密物体的作用。 ***我的短期工作将使用对主动吸积恒星质量黑洞的协调全色观测，将喷流特性的演化与特定吸积盘特性联系起来，作为跨国际设施（包括国家实验室）的一系列分层项目的一部分。加拿大研究委员会或加拿大航天局共同支持的设施（例如甚大阵列、阿塔卡马大型毫米波阵列和 ASTROSAT 天文台）和合作者，以更好地研究吸积恒星质量黑洞并扩展我的工作。对于其他吸积致密天体，我将开发和实施新技术，利用新的观测能力并快速传播新发现的吸积致密天体的知识，作为本发现资助的一部分，我将培训 4 名博士生、2 名硕士生和 5 名本科生。 .**