A PHYSICAL LINK BETWEEN JET FORMATION AND HOT PLASMA IN ACTIVE GALACTIC NUCLEI
A PHYSICAL LINK BETWEEN JET FORMATION AND HOT PLASMA IN ACTIVE GALACTIC NUCLEI
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DOI：
10.1088/0004-637x/770/1/31
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发表时间：
2013-05
期刊：
影响因子：
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通讯作者：
Qingwen Wu;Xinwu Cao;L. Ho;Ding-xiong Wang
中科院分区：
文献类型：
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作者：
Qingwen Wu;Xinwu Cao;L. Ho;Ding-xiong Wang
最近的观测表明，在黑洞X射线双星喷流/外流的形成有关的热等离子体在黑洞附近，无论是在对流为主的吸积流在低吸积率或在高吸积率的盘冠的形式。我们使用两个样本的活动星系核区分的存在（无线电强）和不存在（无线电弱）的准直，相对论性射流的超大质量黑洞的这种情况下测试的可行性。每一个都集中在一个狭窄的黑洞质量范围内，但跨越了一个非常广泛的爱丁顿比范围，有效地模拟了一个单一的黑洞在吸积状态的广泛传播的行为。与射电和光学光度之间的关系不同，在爱丁顿比为1.01%时，高光度源和低光度源之间会出现突变，而射电发射（喷流功率的量度）则随硬X射线（2-10 keV）光度连续变化，大致为。这种关系，对射电弱和射电强的活动星系都成立，类似于X射线双星中的关系。喷流/外流的形成似乎是密切相关的条件，产生的热，光学薄的日冕发射与吸积流，无论是在制度的低和高吸积率。
Recent observations suggest that in black hole X-ray binaries jet/outflow formation is related to the hot plasma in the vicinity of the black hole, either in the form of an advection-dominated accretion flow at low accretion rates or in a disk corona at high accretion rates. We test the viability of this scenario for supermassive black holes using two samples of active galactic nuclei distinguished by the presence (radio-strong) and absence (radio-weak) of well-collimated, relativistic jets. Each is centered on a narrow range of black hole mass but spans a very broad range of Eddington ratios, effectively simulating in a statistical manner the behavior of a single black hole evolving across a wide spread in accretion states. Unlike the relationship between the radio and optical luminosity, which shows an abrupt break between high- and low-luminosity sources at an Eddington ratio of ∼1%, the radio emission—a measure of the jet power—varies continuously with the hard X-ray (2–10 keV) luminosity, roughly as . This relation, which holds for both radio-weak and radio-strong active galaxies, is similar to the one seen in X-ray binaries. Jet/outflow formation appears to be closely linked to the conditions that give rise to the hot, optically thin coronal emission associated with accretion flows, both in the regime of low and high accretion rates.