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首页> 外文期刊>The Astrophysical journal >INTRINSIC CURVATURE IN THE X-RAY SPECTRA OF BL LACERTAE OBJECTS
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INTRINSIC CURVATURE IN THE X-RAY SPECTRA OF BL LACERTAE OBJECTS

机译：BL花边对象的X射线光谱中的本征弯曲

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摘要

We report results from XMM-Newton observations of 13 X-ray bright BL Lacertae objects, selected from the Einstein Slew Survey sample (SSS). The survey was designed to look for evidence of departures of the X-ray spectra from a simple power-law shape (i.e., curvature and/or line features) and to find objects worthy of deeper study. Our data are generally well fit by power-law models, with three cases having hard (Γ < 2; dN/dE ∝ E~(-Γ)) spectra that indicate synchrotron peaks at E approx > 5 keV. Previous data had suggested a presence of absorption features in the X-ray spectra of some BL Lac objects. In contrast, none of these spectra show convincing examples of line features in either absorption or emission, suggesting that such features are rare among BL Lac objects, or, more likely, are artifacts caused by instrumental effects. We find significant evidence for intrinsic curvature [steepening by dΓ/d(log E) = 0.4 ± 0.15] in 14 of the 17 X-ray spectra. This cannot be explained satisfactorily via excess absorption, since the curvature is essentially constant from 0.5-6 keV, an observation that is inconsistent with the modest amounts of absorption that would be required. We use the XMM-Newton Optical Monitor data with concurrent radio monitoring to derive broadband spectral energy distributions and peak frequency estimates. From these, we examine models of synchrotron emission and model the spectral curvature we see as the result of episodic particle acceleration.
机译：我们从XMM-牛顿观测结果中报告了结果，这些观测结果是从爱因斯坦斜率调查样本（SSS）中选择的，对13个X射线明亮的BL蝎虎座物体的观测。该调查旨在寻找X射线光谱偏离简单幂律形状（即曲率和/或线条特征）的证据，并找到值得深入研究的对象。我们的数据通常通过幂律模型很好地拟合，其中三种情况具有硬光谱（Γ<2; dN / dE ∝ E〜（-Γ）），表明在E大约> 5 keV处的同步加速器峰值。先前的数据表明某些BL Lac对象的X射线光谱中存在吸收特征。相反，这些光谱中没有一个在吸收或发射中显示出令人信服的线状特征的实例，表明这些特征在BL Lac对象中很少见，或者更有可能是由仪器效应引起的伪像。我们在17个X射线光谱中的14个中发现了固有曲率[通过dΓ/ d（log E）= 0.4±0.15加深]的重要证据。这不能通过过量吸收来令人满意地解释，因为曲率在0.5-6 keV范围内基本上是恒定的，这与所需的适度吸收量不一致。我们将XMM-Newton光学监视器数据与并发无线电监视一起使用，以得出宽带频谱能量分布和峰值频率估计。通过这些，我们检查了同步加速器发射的模型，并对作为偶发粒子加速结果的光谱曲率建模。

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