论文标题
XMM-Newton在候选超级巨头快速X射线瞬态AX J1714.1-3912中发现了非常高的晦涩
XMM-Newton discovery of very high obscuration in the candidate Supergiant Fast X-ray Transient AX J1714.1-3912
论文作者
论文摘要
我们已经分析了一个档案XMM-Newton Epic观察结果，该观察偶尔覆盖了可变X射线源AX J1714.1-3912的天空位置，此前建议是超级巨头快速X射线瞬态（SFXT）。 During the XMM-Newton observation the source is variable on a timescale of hundred seconds and shows two luminosity states, with a flaring activity followed by unflared emission, with a variability amplitude of a factor of about 50. We have discovered an intense iron emission line with a centroid energy of 6.4 keV in the power law-like spectrum, modified by a large absorption (NH around 1e24 cm-2), never observed before from this 来源。对于SFXT而言，此X射线频谱是不寻常的，但类似于所谓的“高度模糊来源”，高质量X射线二进制文件（HMXBS），载有进化的B [E]超级伴侣（SGB [E]）。这可能表明AX J1714.1-3912是这种罕见类型的HMXB的新成员，其中包括IGR J16318-4848和CI Camelopardalis。增加这一少量来源将是显着的，因为它们代表了大量二进制的一个有趣的短期进化阶段。然而，AX J1714.1-3912似乎共享了两种HMXB的X射线属性（SFXT vs SGB [E] HMXB）。因此，需要对伴侣恒星进行进一步研究，以解除这两个假设。
We have analysed an archival XMM-Newton EPIC observation that serendipitously covered the sky position of a variable X-ray source AX J1714.1-3912, previously suggested to be a Supergiant Fast X-ray Transient (SFXT). During the XMM-Newton observation the source is variable on a timescale of hundred seconds and shows two luminosity states, with a flaring activity followed by unflared emission, with a variability amplitude of a factor of about 50. We have discovered an intense iron emission line with a centroid energy of 6.4 keV in the power law-like spectrum, modified by a large absorption (NH around 1e24 cm-2), never observed before from this source. This X-ray spectrum is unusual for an SFXT, but resembles the so-called "highly obscured sources", high mass X-ray binaries (HMXBs) hosting an evolved B[e] supergiant companion (sgB[e]). This might suggest that AX J1714.1-3912 is a new member of this rare type of HMXBs, which includes IGR J16318-4848 and CI Camelopardalis. Increasing this small population of sources would be remarkable, as they represent an interesting short transition evolutionary stage in the evolution of massive binaries. Nevertheless, AX J1714.1-3912 appears to share X-ray properties of both kinds of HMXBs (SFXT vs sgB[e] HMXB). Therefore, further investigations of the companion star are needed to disentangle the two hypothesis.
