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arXiv 2201.11170astro-ph.HE
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使用XMM和NuSTAR将J18007-4146分类为中间极性

Classifying IGR J18007-4146 as an intermediate polar using XMM and NuSTAR

Benjamin M. Coughenour, John A. Tomsick, Aarran W. Shaw, Koji Mukai, Maïca Clavel, Jeremy Hare, Roman Krivonos, Francesca M. Fornasini

摘要:

许多新的和未知的银河系来源最近被正在进行的硬X射线调查所揭示。其中很大一部分被证明是被称为激变变星(CV)的吸积型白矮星。经常需要进行后续观察,以便对这些来源进行分类和归类,也可能发现可能独特或令人感兴趣的情况。其中一个例子是IGR J18007-4146,它很可能是一个基于钱德拉后续观测和光学/红外目录约束的CV。利用同时XMM-牛顿和NuSTAR观测,以及现有的光学/红外数据,我们确认IGR J18007-4146的性质作为一个中间极性类型的CV。对XMM数据的时间分析揭示了一个424.4 +/- 0.7 s的周期信号,我们将其解释为白矮星的自旋周期。建模0.3-78千电子伏的光谱,我们使用的热韧致辐射连续,但需要固有的吸收,以及软组件和强Fe线之间的6和7千电子伏。我们使用kT = 73 + 8/-6 eV的单温黑体对软分量进行建模。从X射线光谱,我们能够测量到白矮星的质量为1.06 + 0.19/-0.10 Msun,这意味着IGR J18007-4146的质量比磁性CV的平均质量更大。

英文摘要:

Many new and unidentified Galactic sources have recently been revealed by ongoing hard X-ray surveys. A significant fraction of these have been shown to be the type of accreting white dwarfs known as cataclysmic variables (CVs). Follow-up observations are often required to categorize and classify these sources, and may also identify potentially unique or interesting cases. One such case is IGR J18007-4146, which is likely a CV based on follow-up Chandra observations and constraints from optical/IR catalogs. Utilizing simultaneous XMM-Newton and NuSTAR observations, as well as the available optical/IR data, we confirm the nature of IGR J18007-4146 as an intermediate polar type CV. Timing analysis of the XMM data reveals a periodic signal at 424.4 +/- 0.7 s that we interpret as the spin period of the white dwarf. Modeling the 0.3-78 keV spectrum, we use a thermal bremsstrahlung continuum but require intrinsic absorption as well as a soft component and strong Fe lines between 6 and 7 keV. We model the soft component using a single-temperature blackbody with kT = 73 +8/-6 eV. From the X-ray spectrum, we are able to measure the mass of the white dwarf to be 1.06 +0.19/-0.10 Msun, which means IGR J18007-4146 is more massive than the average for magnetic CVs.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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