Markarian 501的喷流从数百万史瓦西半径下降到几百
The jet of Markarian 501 from millions of Schwarzschild radii down to a few hundreds
摘要：
目标：TeV BL Lac天体Markarian 501是一个复杂的核心主导射电源，具有秒差距尺度的单侧扭曲喷流。在目前的工作中，我们试图将我们的理解的源物理的无线电喷流的区域，以前没有访问。方法：我们提出了在1.4和86 GHz的Mrk 501的新观测结果。1.4 GHz数据是在2004年11月使用超大阵列（VLA）和高灵敏度阵列（HSA）以全极化方式获得的，最终有效值为1.4GHz。在HSA总强度图像中，25微焦/束的噪声; 86 GHz的观测是在2005年10月用全球毫米VLBI阵列（GMVA）进行的，提供了高达110 x 40微弧秒的角分辨率。结果如下：HSA提供的灵敏度和分辨率使其能够从其底部检测到约700毫角秒（对应于约500 pc的投影线性尺寸）的喷流，而86 GHz GMVA观测的高分辨率探测了喷流的最内部区域，直到约200 Schwarzschild半径。喷流底部的亮温超过6 e10 K。我们在<1 pc到~40 pc的物理尺度上发现了肢体增亮的证据。偏振图像和射流宽度和亮度与核心距离的趋势拟合揭示了平行于射流轴的磁场。
英文摘要：
Aims: The TeV BL Lac object Markarian 501 is a complex, core dominated radio source, with a one sided, twisting jet on parsec scales. In the present work, we attempt to extend our understanding of the source physics to regions of the radio jet which have not been accessed before. Methods: We present new observations of Mrk 501 at 1.4 and 86 GHz. The 1.4 GHz data were obtained using the Very Large Array (VLA) and High Sensitivity Array (HSA) in November 2004, in full polarization, with a final r.m.s. noise of 25 microJy/beam in the HSA total intensity image; the 86 GHz observations were performed in October 2005 with the Global Millimeter VLBI Array (GMVA), providing an angular resolution as good as 110 x 40 microarcseconds. Results: The sensitivity and resolution provided by the HSA make it possible to detect the jet up to ~700 milliarcseconds (corresponding to a projected linear size of ~500 pc) from its base, while the superior resolution of the 86 GHz GMVA observations probes the innermost regions of the jet down to ~200 Schwarzschild radii. The brightness temperature at the jet base is in excess of 6e10 K. We find evidence of limb brightening on physical scales from <1 pc to ~40 pc. Polarization images and fits to the trend of jet width and brightness vs. distance from the core reveal a magnetic field parallel to the jet axis.
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