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arXiv 1706.04005astro-ph.HE
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七个新的硬X射线激变变星的宽带特征

Broad-band characteristics of seven new hard X-ray selected cataclysmic variables

F. Bernardini, D. de Martino, K. Mukai, D. M. Russell, M. Falanga, N. Masetti, C. Ferrigno, G. Israel

摘要:

我们提出的定时和光谱分析的一个样本的七个硬X射线选择激变变量候选人的基础上,同时收集的X射线和光学观测XMM-牛顿,补充雨燕/BAT和INTEGRAL/IBIS硬X射线数据和地基光学光度。对于六个源,首次在$\rm \sim296-6098\,s$范围内检测到X射线脉动,将它们识别为磁性类的成员。雨燕J0927.7-6945、雨燕J0958.0-4208、雨燕J1701.3-4304、雨燕J2113.5+5422,可能还有PBC J0801.2-4625,都是中极星(IP),而雨燕J0706.8+0325是一个短轨道周期的极星(1.7小时),是迄今为止发现的11颗$^{\rm th}$硬X射线。在Swift J0927.7-6945(5.2 h)和Swift J2113.5+5422(4.1 h)中也观察到X射线轨道调制。Swift J1701.3-4304是发现的轨道周期最长的深食IP(12.8 h)。磁系统的光谱揭示光学薄的多温度发射0.2和60千电子伏之间。Swift J0927.7-6945和Swift J2113.5+5422中的能量相关自旋脉冲和轨道调制是由于介入的局部高密度吸收材料($\rm N_H\sim10^{22-23}\,cm^{-2}$)。在Swift J0958.0-4208和Swift J1701.3-4304中,检测到软X射线黑体(kT $\sim$ 50和$\sim$ 80 eV),将其添加到“软”IP的增长组中。白矮星的质量被确定在$\rm \sim0.58-1.18\,M_{\odot}$范围内,这表明其中五颗白矮星存在大量的吸积主恒星。大多数源的吸积速率低于其轨道周期的预期长期值。斯威夫特J 0746.3 -1608之前被认为是一颗长周期(9.4小时)的新星变星,它的光谱和光变曲线表明它可能是一颗非典型的低光度变星,也可能是一颗低质量的X射线双星。

英文摘要:

We present timing and spectral analysis of a sample of seven hard X-ray selected Cataclysmic Variable candidates based on simultaneous X-ray and optical observations collected with XMM-Newton , complemented with Swift/BAT and INTEGRAL/IBIS hard X-ray data and ground-based optical photometry. For six sources, X-ray pulsations are detected for the first time in the range $\rm \sim296-6098\,s$, identifying them as members of the magnetic class. Swift J0927.7-6945, Swift J0958.0-4208, Swift J1701.3-4304, Swift J2113.5+5422, and possibly PBC J0801.2-4625, are Intermediate Polars (IPs), while Swift J0706.8+0325 is a short (1.7 h) orbital period Polar, the 11$^{\rm th}$ hard X-ray selected identified so far. X-ray orbital modulation is also observed in Swift J0927.7-6945 (5.2 h) and Swift J2113.5+5422 (4.1 h). Swift J1701.3-4304 is discovered as the longest orbital period (12.8 h) deep eclipsing IP. The spectra of the magnetic systems reveal optically thin multi-temperature emission between 0.2 and 60 keV. Energy dependent spin pulses and the orbital modulation in Swift J0927.7-6945 and Swift J2113.5+5422 are due to intervening local high density absorbing material ($\rm N_H\sim10^{22-23}\,cm^{-2}$). In Swift J0958.0-4208 and Swift J1701.3-4304, a soft X-ray blackbody (kT$\sim$50 and $\sim$80 eV) is detected, adding them to the growing group of "soft" IPs. White dwarf masses are determined in the range $\rm \sim0.58-1.18\,M_{\odot}$, indicating massive accreting primaries in five of them. Most sources accrete at rates lower than the expected secular value for their orbital period. Formerly proposed as a long-period (9.4 h) novalike CV, Swift J0746.3-1608 shows peculiar spectrum and light curves suggesting either an atypical low-luminosity CV or a low mass X-ray binary.

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