观测到了来自M87中心的TeV能量光子的快速变化,为估算超大质量黑洞(SMBH)的自旋提供了新的线索.我们扩展了Wang et al.(2008)的研究,包括所有的广义相对论效应。通过数值求解辐射无效吸积流的相对论流体动力学方程组,得到了黑洞周围的辐射场。在Kerr度规中计算了TeV光子对产生的辐射场的光学深度。我们发现,光学深度强烈依赖于:(1)吸积率为$\tautev\propto \dot{M}^{2.5-5.0}$;(2)黑洞自旋;(3)TeV源的位置。结合光学厚度和RIAF辐射的光谱能量分布,可以大大缓解RIAF模型中自旋与其他自由参数的强烈退化。我们将这个模型应用到M87中,发现黑洞的最小比角动量为$a\sim0.8$。本方法适用于M87类源与未来的TeV的排放量的检测,以限制SMBHs的自旋。
英文摘要:
The fast variability of energetic TeV photons from the center of M87 has been detected, offering a new clue to estimate spins of supermassive black holes (SMBHs). We extend the study of Wang et al. (2008) by including all of general relativistic effects. We numerically solve the full set of relativistic hydrodynamical equations of the radiatively inefficient accretion flows (RIAFs) and then obtain the radiation fields around the black hole. The optical depth of the radiation fields to TeV photons due to pair productions are calculated in the Kerr metric. We find that the optical depth strongly depends on: (1) accretion rates as $\tautev\propto \dot{M}^{2.5-5.0}$; (2) black hole spins; and (3) location of the TeV source. Jointly considering the optical depth and the spectral energy distribution radiated from the RIAFs, the strong degeneration of the spin with the other free parameters in the RIAF model can be largely relaxed. We apply the present model to M87, wherein the RIAFs are expected to be at work, and find that the minimum specific angular momentum of the hole is $a\sim0.8$. The present methodology is applicable to M87-like sources with future detection of TeV emissions to constrain the spins of SMBHs.
Constraining the Diffusion Coefficient with HAWC TeV Gamma-Ray Observations of Two Nearby Pulsar Wind Nebulae
附近的电子/正电子加速器,主要是脉冲星风星云(PWNe),被认为是超过10 GeV的正电子过剩的潜在来源。HAWC天文台揭示了两个非常扩展的源,它们在空间上与附近的两个中年恒星重合:Geminga和PSR B 0656 +14,这表明超相对论电子/正电子在我们的后院加速。对这两种PWNe的形态学研究提供了在HAWC能量下扩散系数的约束。在这张海报中,我们将介绍这些PWNe的模型开发和形态学研究,以及最适合数据的衍生扩散系数。
BASS. XXXVI. Constraining the Local Supermassive Black Hole - Halo Connection with BASS DR2 AGN
利用Swift/BAT活动星系核光谱巡天(BASS DR 2)的活动星系核(AGN)的聚类统计和光度函数,研究了局域宇宙中超大质量黑洞(SMBH)与其宿主暗物质晕之间的联系.通过正演模拟活动星系核活动到快照晕目录从N体模拟,我们测试的情况下,SMBH质量相关的暗物质(子)晕质量固定的恒星质量。我们比较这一模型缺乏这种相关性,恒星质量单独决定SMBH质量。我们发现,虽然这两个简单的模型能够在很大程度上再现的丰度和整体集群的活动星系核,黑洞质量与晕质量密切相关的模型是首选的数据由$1.8σ$。当包括一个独立的测量黑洞质量晕质量相关性,这个模型是首选的$4.6σ$。我们发现,与黑洞质量的聚类趋势可以进一步打破两种情况之间的退化,我们的首选模型再现测量的聚类差异1晕尺度之间的大,小黑洞质量。这些结果表明,晕结合能与超大质量黑洞的生长有着根本的联系。
Extreme Love in the SPA: constraining the tidal deformability of supermassive objects with extreme mass ratio inspirals and semi-analytical, frequency-domain waveforms
Constraining Cosmic-Ray Acceleration and Escape in Middle-Aged Supernova Remnants with GeV-TeV Gamma-Ray Observations
Southwest Jiaotong University(西南交通大学);Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);Shanghai Astronomical Observatory, Chinese Academy of Sciences(中国科学院上海天文台)
Constraining the origin of the nanohertz gravitational-wave background by pulsar timing array observations of both the background and individual supermassive binary black holes
Constraining Orbital Eccentricity of a Supermassive Black Hole Binary Candidate PKS 2131-0211
Joint Astronomy Programme, Department of Physics, Indian Institute of Science(印度科学研究所物理系联合天文学项目);Department of Astronomy and Astrophysics, Tata Institute of Fundamental Research(塔塔基础研究院天文与天体物理学系);Max-Planck-Institut für Radioastronomie(马克斯·普朗克射电天文研究所);Department of Physical Sciences, Indian Institute of Science Education and Research Kolkata(加尔各答印度科学教育研究所物理科学系)
Constraining the contribution of Seyfert galaxies to the diffuse neutrino flux in light of point source observations
Max Planck Institute for Physics(马克斯·普朗克物理研究所);TUM School of Natural Sciences, Technical University of Munich(慕尼黑工业大学自然科学院);Institutt for fysikk, Norwegian University of Science and Technology(挪威科技大学物理系);Max Planck Institute for Extraterrestrial Physics(马克斯·普朗克地外物理学研究所)
Constraining leptonic and hadronic gamma-ray emission from HESS J1825-137 and its environment
Universidade Tecnológica Federal do Paraná(巴拉那联邦技术大学);Universidade Federal do Paraná (UFPR)(巴拉那联邦大学);Universidade Federal do Espírito Santo(圣埃斯皮里图联邦大学);Universidade Estadual de Londrina (UEL)(隆德里纳州立大学);Universidade Federal da Integração Latino-Americana(拉丁美洲一体化联邦大学)
Multimessenger Constraints on Supermassive Dark Stars and Their Black Hole Remnants
International Center for Quantum-field Measurement Systems for Studies of the Universe and Particles (QUP,WPI), High Energy Accelerator Research Organization (KEK)(宇宙与粒子量子场测量系统国际中心(QUP,WPI),高能加速器研究机构(KEK));Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK)(粒子与核研究研究所(IPNS),高能加速器研究机构(KEK));Graduate University for Advanced Studies (SOKENDAI)(综合研究大学院大学(SOKENDAI));Kavli Institute for the Physics and Mathematics of the Universe (WPI)(宇宙物理与数学卡弗里研究所(WPI))
Ruling out thermal dark matter with a black hole induced spiky profile in the M87 galaxy
利用室女星系团中邻近的射电星系M87的光谱能量分布,并假设超大质量黑洞在暗物质晕轮廓中引起尖峰,我们排除了任何具有速度无关(s波)湮灭截面为σ v ~ 10^{-26} cm ^3/s量级且质量高达O(100)TeV的暗物质候选者。这些限制取代了所有以前的限制热,s-波,湮灭暗物质候选人的数量级,并排除了整个规范的质量范围。我们还注意到,在尖峰假设下,质量为几TeV、湮灭截面为~ 10^{-27} cm ^3/s的暗物质粒子可以解释在M87中观测到的TeV伽马射线发射。一个中央暗物质尖峰在M87中心的超大质量黑洞周围可能存在,对于各种各样的,虽然不是全部,形成场景,并将对我们理解暗物质微观物理学产生深远的影响。