用GMVA研究BL Lac中的磁场位形
Exploring the magnetic field configuration in BL Lac using GMVA
摘要：
活动星系核（AGN）非热辐射的高射频偏振成像是探测超大质量黑洞（SMBH）附近磁场强度和结构的一种直接方法，对验证喷气发射方案至关重要。为了研究耀变体喷流底部的磁场结构，我们利用了全球毫米波VLBI阵列（GMVA）的全极化能力。在86千兆赫的角分辨率为$\sim$ 50微弧秒（$μ$ as），人们可以分辨高达$\sim$ 450引力半径的尺度（对于一个10 $^9$太阳质量的黑洞，红移为0.1）。本文介绍我们对Blazar BL~Lac的初步研究结果。我们的结果表明，在亚质量尺度上的BL Lac的核心和中央喷流显着偏振与两个不同的区域的偏振强度。我们还注意到，在非常相似的角分辨率下，7 mm/3 mm VLBI图像之间具有很大的形态相似性。
英文摘要：
The high radio frequency polarization imaging of non-thermal emission from active galactic nuclei (AGN) is a direct way to probe the magnetic field strength and structure in the immediate vicinity of supermassive black holes (SMBHs) and is crucial in testing the jet-launching scenario. To explore the the magnetic field configuration at the base of jets in blazars, we took advantage of the full polarization capabilities of the Global Millimeter VLBI Array (GMVA). With an angular resolution of $\sim$50 micro-arcseconds ($μ$as) at 86 GHz, one could resolve scales up to $\sim$450 gravitational radii (for a 10$^9$ solar mass black hole at a redshift of 0.1). We present here the preliminary results of our study on the blazar BL~Lac. Our results suggest that on sub-mas scales the core and the central jet of BL Lac are significantly polarized with two distinct regions of polarized intensity. We also noted a great morphological similarity between the 7mm/3mm VLBI images at very similar angular resolution.
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