活动星系核的首次IRAM/PdBI偏振毫米巡天。II。单个源的活度和性质
The first IRAM/PdBI polarimetric millimeter survey of active galactic nuclei. II. Activity and properties of individual sources
摘要：
本文分析了0415+379（3C~111）、0507+179、0528+134（OG+134）、0954+658、1418+546（OQ+530）和1637+574（OS+562）六个活动星系核的线偏振。从2007年到2011年，我们的目标在观测帧频率范围80-253 GHz（对应于静止帧频率范围88-705 GHz）内进行了监测。我们发现平均偏振度m_L ~ 2-7%;这表明偏振信号被发射器几何形状有效地平均化。我们在我们的源中看到了相当强的激波和/或复杂的、可变的发射区几何形状的迹象，压缩因子<0.9和/或视角变化>10度。源通量和偏振参数之间的相关性的分析指出了特殊情况：存在（至少）两个不同的发射区，具有不同的偏振水平（0415+379），以及从一个单一的，主要的组件（0507+179和1418+546）的发射。关于通量和偏振的演变，我们发现观测结果与一个源（1418+546）中“喷流中的斜激波”情景预测的信号之间有很好的一致性。我们试图获得所有来源的旋转措施，导致两个活动星系核的实际测量和三个来源的上限。我们得到1418+546和1637+574的RM值分别为-39，000 +/-1，000（stat）+/-13，000（sys）rad/m^2和RM = 420，000 +/-10，000（stat）+/-110，000（sys）rad/m^2;这是迄今为止所报道的活动星系核的最高值。这些值表示磁场强度约为0.0001 G。对于0415+379、0507+179和0954+658，我们推导出上限|RM| <17，000 rad/m^2。从关系式|RM| ~ nu^a中，我们发现对于1418+546，a = 1.9 +/- 0.3，与球形或锥形流出的a = 2很好地一致。
英文摘要：
We present an analysis of the linear polarization of six active galactic nuclei - 0415+379 (3C~111), 0507+179, 0528+134 (OG+134), 0954+658, 1418+546 (OQ+530), and 1637+574 (OS+562). Our targets were monitored from 2007 to 2011 in the observatory-frame frequency range 80-253 GHz, corresponding to a rest-frame frequency range 88-705 GHz. We find average degrees of polarization m_L ~ 2-7%; this indicates that the polarization signals are effectively averaged out by the emitter geometries. We see indication for fairly strong shocks and/or complex, variable emission region geometries in our sources, with compression factors <0.9 and/or changes in viewing angles by >10 deg. An analysis of correlations between source fluxes and polarization parameter points out special cases: the presence of (at least) two distinct emission regions with different levels of polarization (for 0415+379) as well as emission from a single, predominant component (for 0507+179 and 1418+546). Regarding the evolution of flux and polarization, we find good agreement between observations and the signal predicted by "oblique shock in jet" scenarios in one source (1418+546). We attempt to derive rotation measures for all sources, leading to actual measurements for two AGN and upper limits for three sources. We derive values of RM = -39,000 +/- 1,000 (stat) +/- 13,000 (sys) rad/m^2 and RM = 420,000 +/- 10,000 (stat) +/- 110,000 (sys) rad/m^2 for 1418+546 and 1637+574, respectively; these are the highest values reported to date for AGN. These values indicate magnetic field strengths of the order ~0.0001 G. For 0415+379, 0507+179, and 0954+658 we derive upper limits |RM| < 17,000 rad/m^2. From the relation |RM| ~ nu^a we find a = 1.9 +/- 0.3 for 1418+546, in good agreement with a = 2 as expected for a spherical or conical outflow.
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