An Infrared Study of the Large-Scale Jet in Quasar PKS 1136–135
An Infrared Study of the Large-Scale Jet in Quasar PKS 1136–135
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类星体 PKS 1136–135 中大型喷流的红外研究
DOI：
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发表时间：
2007
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通讯作者：
L. Maraschi
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作者：
Y. Uchiyama;C. M. Urry;P. Coppi;J. Van Duyne;C. Cheung;R. Sambruna;Tadayuki Takahashi;F. Tavecchio;L. Maraschi
我们展示了类星体 PKS 1136-135 中大型喷流在 3.6 和 5.8 μm 波长下的斯皮策 IRAC 成像，并结合了之前的 VLA、HST 和钱德拉观测。我们清楚地探测到喷流的红外发射，从而获得了以波瓣为主的类星体中喷流中最详细的多频数据。射流结的光谱能量分布沿着射流有显着的变化，就像 3C 273 中的原型射流一样。IRAC 的红外测量与之前的想法一致，即射流具有两个光谱成分，即（1）从无线电延伸到红外的低能同步加速器光谱，以及（2）负责 X 射线通量的高能成分。光通量可以是两种成分的混合物。我们考虑高能部分的三种辐射模型：高度相对论射流中射电发射电子对宇宙微波背景（CMB）光子的逆康普顿散射、第二个不同电子群的同步加速器辐射以及超高能质子的同步加速器辐射。每个假设都会对射流中的粒子加速以及射流的基本物理特性（例如体积速度、传输功率和粒子含量）产生重要的见解和约束。
We present Spitzer IRAC imaging of the large-scale jet in the quasar PKS 1136-135 at wavelengths of 3.6 and 5.8 μm, combined with previous VLA, HST, and Chandra observations. We clearly detect infrared emission from the jet, resulting in the most detailed multifrequency data among the jets in lobe-dominated quasars. The spectral energy distributions of the jet knots have significant variations along the jet, like the archetypal jet in 3C 273. The infrared measurements with IRAC are consistent with the previous idea that the jet has two spectral components, namely (1) the low-energy synchrotron spectrum extending from radio to infrared, and (2) the high-energy component responsible for the X-ray flux. The optical fluxes may be a mixture of the two components. We consider three radiation models for the high-energy component: inverse Compton scattering of cosmic microwave background (CMB) photons by radio-emitting electrons in a highly relativistic jet, synchrotron radiation by a second distinct electron population, and synchrotron radiation by ultra-high-energy protons. Each hypothesis leads to important insights into and constraints on particle acceleration in the jet, as well as the basic physical properties of the jet such as bulk velocity, transporting power, and particle contents.