Relativistic jets from Active Galactic Nuclei (AGN) are highly energetic and emit radiation across a wide range of frequencies. Despite several observational studies, their particle composition still remains a key open question. The detection of high-energy neutrinos from blazar sources such as TXS 0506+056 has highlighted the plausibility of hadronic/lepto-hadronic models for AGN jets. To understand the origin of high-energy neutrinos from such sources, it is imperative to capture the complex interplay between the jet dynamics, their composition, and the mechanism of particle acceleration and cooling in relativistic jets. In this pilot study, we have coupled a numerical multi-zone framework for lepto-hadronic modeling, with 3D relativistic magneto-hydrodynamic simulations of AGN jets, including external photon fields. Our framework provides synthetic multi-wavelength and neutrino flux by spatially sampling the simulated jet into multiple zones. We investigate the implications of such a framework in exploring the different intrinsic and extrinsic pathways for proton-enrichment in jets. Essentially, we find that for low proton-to-electron number density ratios, producing a substantial jet neutrino flux, requires the underlying proton energy distribution to have a relatively flat spectrum with a power-law index of $\simeq 2.0$. We further find that while intrinsic shocks triggered by kink-instabilities in the jet can accelerate electrons to high energies, they may not be sufficient to produce such flat particle energy distributions for the chosen set of parsec-scale jet parameters. Finally, to produce a significant jet neutrino emission, our simulations suggest the need to consider particle acceleration mechanisms through alternative pathways, either internal or external.
Near-horizon structure of escape zones of electrically charged particles around weakly magnetized rotating black hole. II. Acceleration and escape in the oblique magnetosphere
Neutrino and Cascade Gamma-Ray Emission from Magnetized Turbulent Coronae in Seyfert Galaxies
Qinghai Normal University(青海师范大学);Purple Mountain Observatory, Chinese Academy of Sciences(中国科学院紫金山天文台);Ludong University(鲁东大学);Lanzhou University(兰州大学)
Polarization Dynamics of X-Ray Synchrotron Emission from a Multi-Zone Blazar Jet
Washington University in St Louis(圣路易斯华盛顿大学);University of Maryland Baltimore County(马里兰大学巴尔的摩县分校);NASA Goddard Space Flight Center(美国国家航空航天局戈达德太空飞行中心)
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)
High-entropy ejections from magnetized proto-neutron star winds: implications for heavy element nucleosynthesis
虽然最初被认为是有希望的r-过程核的生产,标准模型的中微子加热风从原中子星(PNS)没有达到必要的中子-种子比的生产镧系元素和锕系元素。然而,由r-,rp-,或$νp$ -过程在PNS风中创建的丰度分布敏感地依赖于流的熵和动力学膨胀时间尺度,这可能强烈地受到高磁场的影响。在这里,我们提出的结果,从磁流体动力学模拟的非旋转中微子加热PNS风与强偶极子磁场从$10^{14}-10^{16}$ G,并评估其在改变核合成条件的作用。强场在赤道形成一个封闭的区域和头盔流光结构,在环形等离子体团中有间歇性的动力学质量喷射。我们发现显着增强的熵在这些地区和条件有利于第三峰r-过程核合成,如果风是中子丰富。相反,如果风是富含质子的,则条件将影响来自$νp$过程的丰度。我们量化的熵和动力学膨胀时间尺度的喷射物质的分布,以及影响熵所需的临界磁场强度。对于$B\gtrsim10^{15}$ G,我们发现$\gtrsim10^{-6}$ M $_{\odot}$和高达$\sim10^{-5}$ M $_{\odot}$的高熵物质在风相中的每一个高磁化中子星诞生中都被喷射出来,这为宇宙中迅速的重元素富集提供了一种机制。在超新星遗迹中发现的前双星伴星,遗迹本身和逃逸恒星可能会表现出过度丰度。我们提供了一个比较等离子体团喷发的半解析模型,并讨论了影响和扩展。
Max Planck Institute for Radio Astronomy(马克斯·普朗克射电天文研究所);Department of Astronomy, University of Michigan(密歇根大学天文学系);Special Astrophysical Observatory of the Russian Academy of Sciences(俄罗斯科学院特别天文台);Instituto de Astrofísica de Andalucía-CSIC(安达卢西亚天体物理学研究所-CSIC);Department of Physics and Astronomy, Denison University(丹尼森大学物理与天文学系);Institute for Nuclear Research(核物理研究所);Lebedev Physical Institute(列别杰夫物理研究所);Department of Physics and Astronomy, Purdue University(普渡大学物理与天文学系);CePIA, Astronomy Department, Universidad de Concepción(孔塞普西翁大学天文学系CePIA);Black Hole Initiative, Harvard University(哈佛大学黑洞倡议);Moscow Institute of Physics and Technology(莫斯科物理技术学院)
Radio component of the multi-messenger emission from 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与时域天文中心);Dipartimento di Fisica e Chimica E. Segrè, Università degli Studi di Palermo(巴勒莫大学E. Segrè物理化学系)
X-ray emission from magnetized neutron star atmospheres at low mass accretion rates. I. Phase-averaged spectrum
最近在低光度下对X射线天体的观测首次将高磁化中子星大气在低质量吸积率下的发射理论模型($\dot{M} \lesssim 10^{15}$ g s $^{-1}$)与宽带X射线数据进行了比较。本文的目的是研究中子星大气中低$\dot{M}$的光谱形成,并对发射区的物理性质进行参数研究。我们得到的静态大气的结构,假设库仑碰撞是占主导地位的减速过程。大气的上部被制动等离子体强烈加热,达到30-40 keV的温度,而其密度更大的等温内部则要冷得多(~2 keV)。我们数值求解了磁康普顿散射、自由-自由过程和电子碰撞激发引起的非热回旋辐射的大气中的偏振辐射转移。在低光度X射线谱仪中观察到的强偏振发射光谱具有双峰形状。低能量的“热”成分主要是非常光子,由于它们在软能量下的平均自由程很长,它们可以从更深的层离开大气。我们发现,即使在没有碰撞激发的情况下,在加热的非等温部分的大气中,由于共振康普顿化,也会形成一个高能量的成分。然而,后者影响两种组分的比例。强回旋加速线起源于光学薄的最上部区域。模型与GX 304-1的NuSTAR和Swift/XRT观测的拟合提供了具有合理参数的数据的准确描述。因此,该模型可以再现在低光度X射线谱仪中观察到的特征双峰谱,并提供了对谱形成的见解。
Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences(波兰科学院尼古拉·哥白尼天文中心);Indian Institute of Technology Indore(印度理工学院印多尔分校);Gran Sasso Science Institute (GSSI)(格兰萨索科学研究所);University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);National Center for Supercomputing Applications, University of Illinois at Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校国家超级计算应用中心);Academy of Athens(雅典科学院);Nicolaus Copernicus Superior School, College of Astronomy and Natural Sciences(尼古拉·哥白尼高等学院天文学与自然科学学院);Silesian University in Opava(奥帕瓦西里西亚大学)
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)
Multi-Period Fermi-LAT and LHAASO Constraints on Axion-Like Particles from Mrk 421 via $χ^2$ Profile Likelihood with Gaussian Copula Correlation
Yuxi Normal University(玉溪师范学院);Chinese Academy of Sciences(中国科学院);Qujing Normal University(曲靖师范学院);Hunan Normal University(湖南师范大学);Baoshan University(保山学院)
Magnetized accretion onto rapidly spinning binary black holes: mini-disk thermodynamics, magnetic transport, and dual jets
Perimeter Institute for Theoretical Physics(Perimeter理论物理研究所);Kavli Institute for Particle Astrophysics and Cosmology, Stanford University(斯坦福大学卡弗里粒子天体物理与宇宙学研究所);Center for Computational Relativity and Gravitation, Rochester Institute of Technology(罗切斯特理工学院计算相对论与引力中心);School of Physics and Astronomy, Rochester Institute of Technology(罗切斯特理工学院物理与天文学院);Department of Physics & Astronomy, University of Tennessee(田纳西大学物理与天文学系);Canadian Institute for Theoretical Astrophysics, University of Toronto(多伦多大学加拿大理论天体物理研究所);School of Natural Sciences, Institute for Advanced Study(高等研究院自然科学学院);Dipartimento di Fisica “G. Occhialini”, Università di Milano-Bicocca(米兰比可卡大学“G.奥恰利尼”物理系)
Magnetorotational Explosion of A Massive Star Supported by Neutrino Heating in General Relativistic Three Dimensional Simulations
我们提出的三维(3D),辐射磁流体动力学(MHD)模拟的核心坍缩超新星在完整的广义相对论(GR)与光谱中微子输运的结果。为了研究祖先星自转和磁场的影响,我们计算了三个模型,其中参数化地包含了20 M $_{\odot}$星的坍缩前自转速率和磁场。虽然我们在我们的模拟时间内(反弹后的$\sim500$ ms)没有发现我们的两个非磁化模型中的激波复兴,但在我们的快速旋转和强磁化模型中,磁旋转(MR)驱动的激波膨胀在反弹后立即启动。我们表明,膨胀的MR驱动的流向极方向主要是由磁压驱动,而冲击膨胀向赤道方向是由中微子加热。我们的详细分析表明,所谓的扭结不稳定性的增长可能会阻碍准直射流,导致更广泛的外流的形成。此外,我们还发现只有在MR爆炸模型中才有轻子数的偶极辐射,其不对称性与爆炸形态相一致。虽然它是类似的轻子数发射自持不对称(LESA),我们的分析表明,偶极发射发生的质子中子星对流区,但从上面的中微子球表明,它是不相关的LESA。我们还报告了几个独特的中微子签名,这是显着依赖于时间和视角,如果观察到,可能提供了丰富的信息关于MR驱动的爆炸的开始。
MHDuet : a high-order General Relativistic Radiation MHD code for CPU and GPU architectures
Universitat de les Illes Balears(巴利阿里群岛大学);University of Nottingham(诺丁汉大学);Long Island University(长岛大学);University of Hamburg(汉堡大学);University of Cambridge(剑桥大学)