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首页> 外文期刊>The Astrophysical journal >OBSERVATION OF X-RAY VARIABILITY IN THE BL LACERTAE OBJECT 1ES 1959+65
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OBSERVATION OF X-RAY VARIABILITY IN THE BL LACERTAE OBJECT 1ES 1959+65

机译：观察BL BLACERTAE 1ES 1959 + 65的X射线变异性

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摘要

This paper reports X-ray spectral observations of a relatively nearby (z = 0.048) BL Lac object 1ES 1959+65, which is a potential TeV emitter. The observations include 31 short pointings made by the Unconventional Stellar Aspect (USA) experiment on board the Advanced Research and Global Observation Satellite (ARGOS), and 17 pointings by the Proportional Counter Array (PCA) on board the Rossi X-Ray Timing Explorer (RXTE). Most of these observations were spaced by less than 1 day. 1ES 1959+65 was detected by the ARGOS USA detector in the range 1-16 keV, and by the PCA in the 2-16 keV range but at different times. During the closely spaced RXTE observations beginning on 2000 July 28, the ending of one flare and the start of another are visible, associated with spectral changes, where the photon index Γ ranges between ～1.4 and ～1.7, and the spectrum is harder when the source is brighter. This implies that 1ES 1959+65 is an X-ray-selected BL Lac type (XBL) blazar, with the X-ray emission likely to originate via the synchrotron process. The USA observations reveal another flare that peaked on 2000 November 14 and doubled the flux within a few days, again associated with spectral changes of the same form. The spectral variability correlated with the flux and timing characteristics of this object that are similar to those of other nearby BL Lac objects and suggest relativistic beaming with a Doppler factor δ ≥ 1.6 and magnetic fields on the order of a few milli-gauss. We also suggest that the steady component of the X-ray emission―present in this object as well as in other XBLs―may be due to the large-scale relativistic jet (such as measured by Chandra in many radio-loud active galactic nuclei) but pointing very closely to our line of sight.
机译：本文报告了相对较近（z = 0.048）BL Lac对象1ES 1959 + 65的X射线光谱观察结果，该对象是潜在的TeV发射器。观测结果包括美国高级研究和全球观测卫星（ARGOS）上的非常规恒星纵横（美国）实验做出的31个短点，以及在Rossi X射线定时探测器（Rossi X-Ray Timing Explorer）上由比例计数器阵列（PCA）做出的17个短点（ RXTE）。这些观察结果大多数间隔不到1天。 ARGOS USA检测器在1-16 keV范围内检测到1ES 1959 + 65，PCA在2-16 keV范围内在不同时间检测到1ES 1959 + 65。在2000年7月28日开始的近距离RXTE观测中，一个耀斑的结束和另一个耀斑的开始是可见的，这与光谱变化有关，其中光子指数Γ介于〜1.4和〜1.7之间，而当光源更亮。这意味着1ES 1959 + 65是X射线选择的BL Lac类型（XBL）blazar，其X射线发射很可能是通过同步加速器过程产生的。美国的观测表明，另一个耀斑在2000年11月14日达到峰值，并在几天之内使通量翻了一番，再次与相同形式的光谱变化有关。与该物体的通量和定时特性相关的光谱变异性与附近的其他BL Lac物体的光谱变异性相关，并暗示相对论性波束具有多普勒因子δ≥1.6和磁场约为几高斯。我们还建议，存在于该物体以及其他XBL中的X射线发射的稳定分量可能是由于大规模相对论射流（例如Chandra在许多放射性大声活跃银河核中所测量的）但要非常接近我们的视线

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