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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >VLBI Detections of Parsec-Scale Nonthermal Jetsin Radio-Loud Broad Absorption Line Quasars
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VLBI Detections of Parsec-Scale Nonthermal Jetsin Radio-Loud Broad Absorption Line Quasars

机译：超音速宽射吸收线类对等尺度尺度非热射流的VLBI检测

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摘要

We conducted radio detection observations at 8.4 GHz for 22 radio-loud broad absorption line (BAL) quasars,selected from the Sloan Digital Sky Survey Third Data Release, by a very-long-baseline interferometry (VLBI)technique. The VLBI instrument we used was developed by the Optically ConnecTed Array for VLBI Explorationproject (OCTAVE), which is operated as a subarray of the Japanese VLBI Network. We aimed to select BALquasars with nonthermal jets suitable for measuring their orientation angles and ages by subsequent detailed VLBIimaging studies to evaluate two controversial issues of whether BAL quasars are viewed nearly edge-on, and ofwhether BAL quasars are in a short-lived evolutionary phase of the quasar population. We detected 20 out of 22sources using the OCTAVE baselines, implying brightness temperatures greater than 105K, which presumably comefrom nonthermal jets. Hence, BAL outflows and nonthermal jets can be generated simultaneously in these centralengines. We also found four inverted-spectrum sources, which are interpreted as Doppler-beamed, pole-on-viewedrelativistic jet sources, or young radio sources: single edge-on geometry cannot describe all BAL quasars. Wediscuss the implications of the OCTAVE observations for investigations for the orientation and evolutionary stageof BAL quasars.
机译：我们通过超长基线干涉测量（VLBI）技术对从Sloan Digital Sky Survey Third Data Release中选出的22个无线电大声宽吸收线（BAL）类星体进行了8.4 GHz的无线电探测观测。我们使用的VLBI仪器是由VLBI勘探项目的光学连接阵列（OCTAVE）开发的，它是日本VLBI网络的子阵列。我们的目的是通过随后的详细VLBIimaging研究选择具有非热射流的BAL类星体，以测量其取向角和年龄，以评估两个有争议的问题，即是否BAL类星体几乎是近视的，以及BAL类星体是否处于生命的短暂演化阶段类星体人口。我们使用OCTAVE基线检测到22个光源中的20个，这意味着亮度温度大于105K，这大概是来自非热流。因此，在这些中央发动机中可以同时产生BAL流出和非热喷射。我们还发现了四个倒频谱源，它们被解释为多普勒光束，极点相对论射流源或年轻的无线电源：单边形几何无法描述所有BAL类星体。我们讨论了OCTAVE观测对于BAL类星体的定向和演化阶段的研究意义。

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