在暗活动核M81 * 上广泛的同时宽带运动的结果：黑洞中质量标度吸积的进一步证据
Results from an extensive simultaneous broadband campaign on the underluminous active nucleus M81*: further evidence for mass-scaling accretion in black holes
摘要：
本文介绍了对附近低光度活动星系核M81* 进行宽带同步观测的结果。从2005年2月到8月，我们使用钱德拉X射线天文台的高能透射光栅光谱仪对M81* 进行了五次观测，并辅以巨型米波射电望远镜、甚大阵和甚大基线阵、IRAM的Plateau de Bure干涉仪、亚毫米阵和Lick天文台的地面观测。我们讨论了与以前的结果相比，所得光谱在短时间和长时间尺度上的变化，特别是在X射线中，这是第一次以足够高的空间分辨率进行长期运动，几乎可以隔离核（17pc）。我们比较我们的银河系中心弱活性核Sgr A*，它经历了类似的运动，以及弱吸积的X射线双星的背景下流出为主的模型的光谱。最近的结果表明，弱吸积黑洞的物理规模与质量可预测的协议，我们发现，完全相同的模型，成功地描述了硬态X射线双星适用于M81*，具有非常相似的物理参数。
英文摘要：
We present the results of a broadband simultaneous campaign on the nearby low-luminosity active galactic nucleus M81*. From February through August 2005, we observed M81* five times using the Chandra X-ray Observatory with the High-Energy Transmission Grating Spectrometer, complemented by ground-based observations with the Giant Meterwave Radio Telescope, the Very Large Array and Very Large Baseline Array, the Plateau de Bure Interferometer at IRAM, the Submillimeter Array and Lick Observatory. We discuss how the resulting spectra vary over short and longer timescales compared to previous results, especially in the X-rays where this is the first ever longer-term campaign at spatial resolution high enough to nearly isolate the nucleus (17pc). We compare the spectrum to our Galactic center weakly active nucleus Sgr A*, which has undergone similar campaigns, as well as to weakly accreting X-ray binaries in the context of outflow-dominated models. In agreement with recent results suggesting that the physics of weakly-accreting black holes scales predictably with mass, we find that the exact same model which successfully describes hard state X-ray binaries applies to M81*, with very similar physical parameters.
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