Cosmic ray generation by quasar remnants: constraints and implications
Cosmic ray generation by quasar remnants: constraints and implications
复制标题
类星体遗迹产生宇宙射线：限制和影响
DOI：
10.1046/j.1365-8711.2000.03768.x
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发表时间：
2000
影响因子：
4.8
通讯作者：
M. Loewenstein
中科院分区：
文献类型：
--
作者：
E. Boldt;M. Loewenstein
邻近的巨型椭圆星系NGC 4486（M87）、1399、4649和4472的类星体残余核心是超大质量（>109 M <$）黑洞的所在地。这些对象调查的可行性的猜想，他们可以海港紧凑的发电机能够产生最高能量的宇宙射线。对于一个吸积过程，涉及一个均分磁场附近的事件视界的基本假定的自旋黑洞，能量可以实现加速质子可以很好地为1020 eV的所有这些星系时，只考虑由曲率辐射引起的阻力。估计的光谱能量分布（SED）的环境核心光子导致的结论是，在质子碰撞与这些目标光子产生的光π介子的能量损失是相对较小的，但M87。对于M87，周围的光子场可能是一个限制因素。与邦迪速率和恒星质量损失速率相当的101 M yr−1的吸积速率，与其他（电磁暗的）银河核心位置（>1020 eV）的宇宙射线产生有关。如果这些地点被发现是这种宇宙射线的来源，这将表明存在一个全球性的星际气体流入，一直进入宿主星系的中心。
The quasar remnant cores of nearby giant elliptical galaxies NGC 4486 (M87), 1399, 4649 and 4472 are the sites of supermassive (>109 M⊙) black holes. These objects are investigated as to the viability of the conjecture that they could harbour compact dynamos capable of generating the highest energy cosmic rays. For an accretion process involving an equipartition magnetic field near the event horizons of the underlying putative spun-up black holes, the energy achievable in accelerating protons could well be 1020 eV for all these galaxies when only considering the drag induced by curvature radiation. Estimates of the spectral energy distribution (SED) of ambient core photons lead to the conclusion that the energy losses arising from photo-pion production in proton collisions with these target photons are relatively small for all but M87. For M87, the ambient photon field is likely to be a limiting factor. Accretion rates of ∼1 M⊙ yr−1, comparable to the Bondi rates and to the stellar mass-loss rates, are associated with (>1020 eV) cosmic ray generation in the other (electromagnetically dark) galactic core sites. If these sites are found to be sources of such cosmic rays, it would suggest the presence of a global inflow of interstellar gas all the way into the centre of the host galaxy.