Non-thermal X-ray emission in compact accretion engines can be interpreted to result from magnetic dissipation in an optically thin magnetized corona above an optically thick accretion disk. If coronal magnetic field originates in the disk and the disk is turbulent, then only magnetic structures large enough for their turbulent shredding time to exceed their buoyant rise time survive the journey to the corona. We use this concept and a physical model to constrain the minimum fraction of magnetic energy above the critical scale for buoyancy as a function of the observed coronal to bolometric emission. Our results suggest that a significant fraction of the magnetic energy in accretion disks resides in large scale fields, which in turn provides circumstantial evidence for significant non-local transport phenomena and the need for large scale magnetic field generation. For the example of Seyfert AGN, for which of order 30 per cent of the bolometric flux is in the X-ray band, we find that more than 20 per cent of the magnetic energy must be of large enough scale to rise and dissipate in the corona.
Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
为了解释活动星系核(AGN)的X射线谱,过去文献中广泛讨论了活动星系核日冕中的非热活动,如对级联模型。虽然1990年代的X射线和伽马射线观测不支持这种对级联模型,但最近对西弗特附近的毫米波观测证实了微弱的非热日冕活动的存在。此外,IceCube合作报告称,附近的Seyfert NGC 1068是他们10年调查中最热门的地点。这些证据足以再次深入研究活动星系核日冕的非热效应。本文总结了我们目前对活动星系核日冕的观测认识,并描述了活动星系核日冕如何产生高能粒子。我们还提供了无线电,X射线,兆电子伏的伽马射线和高能中微子观测来测试活动星系核日冕模型的方法。
Self-Consistent Modelling of Neutrino Production in Turbulent Black Hole Coronae
Université Paris Cité, CNRS, Astroparticule et Cosmologie(巴黎西岱大学,法国国家科学研究中心,亚原子粒子与宇宙学);Max Planck Institute for Plasma Physics (IPP)(马克斯·普朗克等离子体物理研究所);Institute for Theoretical Physics, Heidelberg University(海德堡大学理论物理研究所)
High-energy Emission from Turbulent Electron-ion Coronae of Accreting Black Holes
Centre for mathematical Plasma Astrophysics, Department of Mathematics, KU Leuven(鲁汶大学数学系数学等离子体天体物理中心);Department of Physics, University of Maryland(马里兰大学物理系);Physics Department and Columbia Astrophysics Laboratory, Columbia University(哥伦比亚大学物理系和哥伦比亚天体物理实验室);Max Planck Institute for Astrophysics(马克斯·普朗克天体物理研究所);Department of Astronomy and Joint Space-Science Institute, University of Maryland(马里兰大学天文系和联合空间科学研究所)
Turbulent AGN coronae as the origin of diffuse neutrinos up to PeV energies
School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);Key laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education(现代天文学和天体物理学教育部重点实验室(南京大学));Tianfu Cosmic Ray Research Center(天府宇宙线研究中心)
On high-energy particles in accretion disk coronae of supermassive black holes: implications for MeV gamma rays and high-energy neutrinos from AGN cores
Coupled Time-Dependent Proton Acceleration and Leptonic-Hadronic Radiation in Turbulent Supermassive Black Hole Coronae
Deutsches Elektronen-Synchrotron DESY(德国电子同步加速器);National and Kapodistrian University of Athens(雅典国立卡波迪斯特里安大学);Queen’s University(女王大学);Arthur B. McDonald Canadian Astroparticle Physics Research Institute(阿瑟·B·麦克唐纳加拿大高能天体粒子物理研究所);Perimeter Institute for Theoretical Physics(理论物理前沿研究所)
When will T Coronae Borealis next erupt as a nova? Constraints from recurrence, orbital phase, and accretion-state evolution
Liupanshui Normal University(六盘水师范学院);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台);Tsung-Dao Lee Institute, Shanghai Jiao Tong University(上海交通大学汤正道研究院);Yunnan Observatories, Chinese Academy of Sciences (CAS)(中国科学院云南天文台);INAF - Osservatorio Astronomico di Padova(意大利国家天体物理研究所帕多瓦天文台);Qiannan Normal University for Nationalities(黔南民族师范学院);Guizhou University(贵州大学);Xi’an Jiaotong University(西安交通大学)
Can magnetic reconnection power neutrino emission from AGN coronae?
University of Colorado, Boulder(科罗拉多大学博尔德分校);Center for Integrated Plasma Studies(综合等离子体研究中心);JILA(JILA研究所);National Institute of Standards and Technology(美国国家标准与技术研究院);Department of Astrophysical and Planetary Sciences(天体物理与行星科学系)
Relations between phenomenological and physical parameters in the hot coronae of AGNs computed with the MoCA code
活动星系核中的初级X射线辐射被广泛认为是由于来自热电子日冕中吸积盘的热辐射的康普顿化。由此产生的光谱可以,在第一近似,与截止功率定律,光子指数和高能量翻转编码信息的X射线发射区域的物理性质建模。自从10 keV以上的X射线卫星发射以来,人们对活动星系核($Γ$,E $_c$)的光子指数和高能曲率进行了大量的研究。然而,由于NuSTAR前所未有的高达79 keV的灵敏度,这两个可观测量的高精度测量仅在近年来才获得。我们的目的是推导之间的关系的唯象参数($Γ$和E $_c$)和X射线发射区域(热日冕)的固有属性,即光学深度和温度。我们使用MoCA(Monte Carlo code for Comptonisation in Astrophysics)产生的合成光谱的情况下,活动星系核的M $_{BH}$ =1.5 $\times$ 10 $^8$ M $_{sun}$和吸积率为10%,然后比较它们与广泛使用的幂律模型与指数高能截止。我们提供了有关$Γ$和E $_c$与冠状电子的不透明度和温度的球形和板状冠的情况下的唯象关系。这些关系给出了一个定义良好的参数空间,其中完全包含观测值的起源。利用文献中引用的越来越多的高能量截止值,我们报告使用MoCA获得的物理量与使用通常采用的光谱康普顿化模型估计的物理量的比较。最后,我们讨论了不同的黑洞质量和吸积率对推导关系的影响。
Probing the potential high-energy messengers of the anticipated T Coronae Borealis outburst
INAF - Osservatorio Astronomico di Palermo(意大利国家天体物理研究所巴勒莫天文台);Institute for Applied Problems in Mechanics and Mathematics, National Academy of Sciences of Ukraine(乌克兰国家科学院应用力学与数学问题研究所);Center for Data Intensive and Time Domain Astronomy, Department of Physics and Astronomy, Michigan State University(密歇根州立大学物理与天文学系数据密集型时域天文中心);Dipartimento di Fisica e Chimica E. Segrè, Università degli Studi di Palermo(巴勒莫大学E. Segre物理化学系)
Production of High Energy Neutrinos in the Coronae of Ultraluminous X-ray Sources
Department of Physics, Graduate School of Science Tokyo Metropolitan University(东京都立大学理学研究科物理学系);Astronomical Institute, Graduate School of Science, Tohoku University(东北大学理学研究科天文学研究所);Frontier Research Institute for Interdisciplinary Sciences, Tohoku University(东北大学交叉前沿科学研究所)
AGN X-ray coronae at high luminosity: A broadband study of RBS 229 and PG 1407+265
Università degli Studi Roma Tre(罗马三大学);ASI – Agenzia Spaziale Italiana(意大利航天局);INAF – Osservatorio Astronomico di Roma(罗马天文台);INAF – Osservatorio Astrofisico di Arcetri(阿切尔菲天文台);INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(博洛尼亚天体物理与空间科学天文台);Univ. Grenoble Alpes, CNRS, IPAG(格勒诺布尔阿尔卑斯大学);Jet Propulsion Laboratory, California Institute of Technology(加州理工学院喷气推进实验室);Alma Mater Studiorum, Università degli Studi di Bologna(博洛尼亚大学)
Supermassive Black Hole Winds in X-rays: SUBWAYS V. Properties of hot coronae in quasars at intermediate redshift
INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna (OAS)(意大利国家天体物理研究所博洛尼亚天文物理与空间科学观测站);Dipartimento di Fisica e Astronomia (DIFA), Università di Bologna(博洛尼亚大学物理与天文学系);European Southern Observatory (ESO)(欧洲南方天文台);Centro de Astrobiología (CAB), CSIC-INTA(西班牙国家科学技术研究委员会-国家航空航天技术研究所天体生物学中心);Dipartimento di Matematica e Fisica, Università degli Studi Roma Tre(罗马第三大学数学与物理系);Dep. of Physics and Astronomy, Clemson University(克莱姆森大学物理与天文学系)