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CHANDRA DISCOVERY OF 10 NEW X-RAY JETS ASSOCIATED WITH FR II RADIO CORE-SELECTED AGNs IN THE MOJAVE SAMPLE

机译:在MOJAVE样本中10个与FR II无线电核选择的AGN相关的新型X射线机的钱德拉发现

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The Chandra X-ray Observatory has proven to be a vital tool for studying high-energy emission processes in jets associated with active galactic nuclei (AGNs). We have compiled a sample of 27 AGNs selected from the radio flux-limited MOJAVE (Monitoring of Jets in AGNs with VLBA Experiments) sample of highly relativistically beamed jets to look for correlations between X-ray and radio emission on kiloparsec (kpc) scales. The sample consists of all MOJAVE quasars that have over 100 mJy of extended radio emission at 1.4?GHz and a radio structure of at least 3'' in size. Previous Chandra observations have revealed X-ray jets in 11 of 14 members of the sample, and we have carried out new observations of the remaining 13 sources. Of the latter, 10 have X-ray jets, bringing the overall detection rate to ~78%. Our selection criterion, which is based on highly compact, relativistically beamed jet emission and large extended radio flux, thus provides an effective method of discovering new X-ray jets associated with AGNs. The detected X-ray jet morphologies are generally well correlated with the radio emission, except for those displaying sharp bends in the radio band. The X-ray emission mechanism for these powerful FR II (Fanaroff-Riley type II) jets can be interpreted as inverse Compton scattering off of cosmic microwave background photons by the electrons in the relativistic jets. We derive viewing angles for the jets, assuming a non-bending, non-decelerating model, by using superluminal parsec scale speeds along with parameters derived from the inverse Compton X-ray model. We use these angles to calculate best-fit Doppler and bulk Lorentz factors for the jets, as well as their possible ranges, which leads to extreme values for the bulk Lorentz factor in some cases. When both the non-bending and non-decelerating assumptions are relaxed the only constraints on the kpc-scale jet from the Chandra and Very Large Array observations are an upper limit on the viewing angle, and a lower limit on the bulk Lorentz factor.
机译:钱德拉X射线天文台已被证明是研究与活动银河核(AGN)相关的射流中高能发射过程的重要工具。我们收集了27个AGN样本,这些样本选自无线电通量受限的MOJAVE(使用VLBA实验监测AGN中的射流)样本,是相对论性强的射束,以寻找X射线与千帕秒(kpc)尺度上的无线电发射之间的相关性。该样本由所有MOJAVE类星体组成,这些类星体在1.4?GHz处具有超过100mJy的扩展无线电发射,并且其无线电结构的大小至少为3''。 Chandra先前的观测结果揭示了样本14个成员中有11个的X射线射流,我们对其余13个源进行了新的观测。在后者中,有10个具有X射线喷射,使总检测率达到〜78%。我们的选择标准基于高度紧凑的,相对论性的射束发射和较大的扩展无线电通量,因此提供了一种发现与AGN相关的新X射线射流的有效方法。除了在无线电频带中表现出急剧弯曲的那些外,检测到的X射线射流形态通常与无线电发射具有良好的相关性。这些强大的FR II(Fanaroff-Riley II型)射流的X射线发射机理可以解释为相对论射流中电子从宇宙微波背景光子中逆康普顿散射。我们使用超光速差距速度和从反康普顿X射线模型得出的参数,假设一个非弯曲,非减速模型,得出了喷射器的视角。我们使用这些角度来计算最适合飞机的多普勒和洛伦兹因子及其可能的范围,这在某些情况下会导致洛伦兹因子的极值。放宽非弯曲和非减速假设时,Chandra和甚大型阵列观测值对kpc尺度射流的唯一约束是视角的上限,以及整体洛伦兹因子的下限。

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