物理
天体物理喷流
天体物理学
甚长基线干涉测量
增值(金融)
超光速运动
喷射(流体)
相对论量子化学
相对论波束
自旋(空气动力学)
辐射传输
天文
活动星系核
银河系
机械
量子力学
核物理学
热力学
作者
Alejandro Cruz-Osorio,Christian M. Fromm,Yosuke Mizuno,Antonios Nathanail,Ziri Younsi,Oliver Porth,Jordy Davelaar,H. Falcke,M. Krämer,Luciano Rezzolla
出处
期刊:Nature Astronomy
[Springer Nature]
日期:2021-11-04
卷期号:6 (1): 103-108
被引量:45
标识
DOI:10.1038/s41550-021-01506-w
摘要
M87 has been the target of numerous astronomical observations across the electromagnetic spectrum and Very Long Baseline Interferometry (VLBI) resolved an edge-brightened jet. However, the origin and formation of its jets remain unclear. In our current understand black holes (BH) are the driving engine of jet formation, and indeed the recent Event Horizon Telescope (EHT) observations revealed a ring-like structure in agreement with theoretical models of accretion onto a rotating Kerr BH. In addition to the spin of the BH being a potential source of energy for the launching mechanism, magnetic fields are believed to play a key role in the formation of relativistic jets. A priori, the spin, $a_\star$, of BH in M87* is unknown, however, when accounting for the estimates on the X-ray luminosity and jet power, values $\left |a_\star \right| \gtrsim 0.5$ appear favoured. Besides the properties of the accretion flow and the BH spin, the radiation microphysics including the particle distribution (thermal and non-thermal) as well as the particle acceleration mechanism play a crucial role. We show that general-relativistic magnetohydrodynamics simulations and general-relativistic radiative transfer calculations can reproduce the broadband spectrum from the radio to the near-infrared regime and simultaneously match the observed collimation profile of M87, thus allowing us to set rough constraints on the dimensionless spin of M87* to be $0.5\lesssim a_{\star}\lesssim 1.0$, with higher spins being possibly favoured.
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