Two new intermediate polars with a soft X-ray component

Two new intermediate polars with a soft X-ray component
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两个带有软 X 射线组件的新型中间极轴

DOI:
10.1051/0004-6361:200810402
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发表时间:
2008
影响因子:
6.5
通讯作者:
Anzolin G
Anzolin G
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Anzolin G

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目的我们使用 XMM-Newton 分析 1RXS J070407.9+262501 和 1RXS 180340.0+401214 的第一个 X 射线观测结果,以表征它们的宽带时间和光谱特性(也在 UV/光学域),并确认它们为中间极性。方法对于这两个物体,我们对 X 射线和 UV/光学光曲线进行了时序分析,探测白矮星自旋脉动并研究它们的能量依赖性。对于 1RXS 180340.0+401214,我们还分析了光学光谱数据以确定轨道周期。在 0.2–10.0 keV 范围内分析 X 射线光谱,以表征两个源的发射特性。结果我们发现,两个系统的 X 射线光变曲线均与能量相关,并且在低于 3–5 keV 时,主要受白矮星自转周期(1RXS J070407.9+262501 为 480 s,1520.5 s)的强脉动支配。 1RXS 180340.0+401214)。在 1RXS 180340.0+401214 中,我们还检测到 1697 秒的 X 射线拍频变化,与我们的新光谱一起,有利于 4.4 小时的轨道周期,比之前估计的要长。两个系统都显示出复杂的光谱,其中硬(温度高达 40 keV)光学薄和软(kT~ 85-100 eV)光学厚成分被部分覆盖 X 射线源的材料大量吸收。结论我们的观察证实这两个系统为中间极性,并将它们添加为不断增长的“软”系统组的新成员,这些系统显示了软 X 射线黑体成分的存在。黑体温度的差异可以通过对不同尺寸的白矮星斑点进行再处理来定性地解释。我们认为,显示出较冷的软 X 射线黑体成分的系统也拥有受到回旋辐射照射的白矮星。
AimsWe analyze the first X-ray observations with XMM-Newton of 1RXS J070407.9+262501 and 1RXS 180340.0+401214, in order to characterize their broad-band temporal and spectral properties, also in the UV/optical domain, and to confirm them as intermediate polars.MethodsFor both objects, we performed a timing analysis of the X-ray and UV/optical light curves to detect the white dwarf spin pulsations and study their energy dependence. For 1RXS 180340.0+401214 we also analyzed optical spectroscopic data to determine the orbital period. X-ray spectra were analyzed in the 0.2–10.0 keV range to characterize the emission properties of both sources.ResultsWe find that the X-ray light curves of both systems are energy dependent and are dominated, below 3–5 keV, by strong pulsations at the white dwarf rotational periods (480 s for 1RXS J070407.9+262501 and 1520.5 s for 1RXS 180340.0+401214). In 1RXS 180340.0+401214 we also detect an X-ray beat variability at 1697 s which, together with our new optical spectroscopy, favours an orbital period of 4.4 h that is longer than previously estimated. Both systems show complex spectra with a hard (temperature up to 40 keV) optically thin and a soft (kT~ 85–100 eV) optically thick components heavily absorbed by material partially covering the X-ray sources.ConclusionsOur observations confirm the two systems as intermediate polars and also add them as new members of the growing group of “soft” systems which show the presence of a soft X-ray blackbody component. Differences in the temperatures of the blackbodies are qualitatively explained in terms of reprocessing over different sizes of the white dwarf spot. We suggest that systems showing cooler soft X-ray blackbody components also possess white dwarfs irradiated by cyclotron radiation.
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