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，即物质通过旋转的圆盘落在物体上，是普遍存在的。天文学家已经在恒星系统的前身中，在恒星的致密残余物（吸积的白色矮星、中子星和恒星质量黑洞）周围，以及在具有超大质量黑洞的星系中心（活动星系核，AGN）观察到了吸积盘。通过盘的材料的这种流入也与材料的流出相关。这些外流可以是盘风、非相对论性喷流，而在吸积致密物体的情况下，则是相对论性喷流。尽管有这种普遍性，在我们对吸积和喷流物理的理解中仍然有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联系活动星系核和星系形成的反馈循环中起着重要作用，因此圆盘-喷流耦合的故事可能与人类如何到达这里的故事交织在一起。 由于爆发的时间尺度为~1- 1亿年，人们必须研究大量的活动星系核，以了解在整个爆发周期中发生的吸积和喷流物理。 然而，恒星质量吸积致密物体在整个爆发过程中的演变时间尺度为数周至数十年。研究涵盖了这些物体的整个爆发，扩展了我们对吸积和喷流物理学更广泛领域的理解。我的研究项目主要集中在吸积和相对论性喷流的物理学，特别是它们在吸积致密物体中的联系。 我用这些系统的全色观测来约束吸积和相对论喷流的物理学。我的长期目标是将喷流性质的演化与吸积盘在所有吸积状态下的光谱和时间性质的具体和详细的演化精确地联系起来。通过这样做，我的目标是充分理解吸积和相对论喷流物理学，以精确确定恒星质量和超大质量吸积致密天体在星系形成中的作用。我的短期工作将连接喷流属性的演变，以具体的吸积盘属性使用协调全色观测积极吸积恒星质量黑洞的一部分，跨国际设施的分层项目集（包括加拿大国家研究理事会或加拿大航天局共同支持的设施，如甚大阵列、阿塔卡马大型毫米阵列、和ASTROSAT天文台）和合作者。为了更好地研究吸积恒星质量黑洞，并将我的工作扩展到其他吸积致密天体，我将开发和实施新技术，利用新的观测能力，迅速传播新发现的吸积致密天体的知识。我将培养4名博士，2名硕士和5名本科生，作为这项发现补助金的一部分。