CHANDRA OBSERVATIONS OF THE HIGH-MAGNETIC-FIELD RADIO PULSAR J1718−3718
CHANDRA OBSERVATIONS OF THE HIGH-MAGNETIC-FIELD RADIO PULSAR J1718−3718
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DOI：
10.1088/0004-637x/734/1/44
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发表时间：
2010-11
期刊：
影响因子：
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通讯作者：
Weiwei Zhu;V. Kaspi;M. Mclaughlin;G. Pavlov;C. Ng;R. Manchester;B. Gaensler;Peter M. Woods
中科院分区：
文献类型：
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作者：
Weiwei Zhu;V. Kaspi;M. Mclaughlin;G. Pavlov;C. Ng;R. Manchester;B. Gaensler;Peter M. Woods
高磁场脉冲星是研究磁星和射电脉冲星之间关系的一类重要天体。在这里，我们报告了 2009 年对高磁场脉冲星 J1718−3718 (B = 7.4 × 1013 G) 进行的四次钱德拉观测，以及对 2002 年钱德拉对该区域观测的重新分析。我们还根据 ATCA 观测报告了该脉冲星的改进无线电位置。我们在 2009 年的数据中检测到脉冲星周期的 X 射线脉动，0.8–2.0 keV 频段的脉冲分数为 52% ± 13%。我们发现 X 射线脉冲与无线电脉冲是一致的。 2002 年和 2009 年的数据显示了一致的光谱和通量：合并的整体光谱与温度为 186+19 − 18 eV 的黑体很好地拟合，略高于标准冷却模型的预测；然而，最适合的中子星大气模型与标准冷却是一致的。我们发现距离为 4.5 kpc 时，测辐射热光度 L∞bb = 4+5 − 2 × 1032 erg s−1。我们汇编了所有 X 射线探测到的高 B 脉冲星以及低 B 射电脉冲星的温度测量结果，并找到了前者平均比后者更热的证据。
High-magnetic-field pulsars represent an important class of objects for studying the relationship between magnetars and radio pulsars. Here we report on four Chandra observations of the high-magnetic-field pulsar J1718−3718 (B = 7.4 × 1013 G) taken in 2009 as well as a reanalysis of 2002 Chandra observations of the region. We also report an improved radio position for this pulsar based on ATCA observations. We detect X-ray pulsations at the pulsar's period in the 2009 data, with a pulsed fraction of 52% ± 13% in the 0.8–2.0 keV band. We find that the X-ray pulse is aligned with the radio pulse. The data from 2002 and 2009 show consistent spectra and fluxes: a merged overall spectrum is well fit by a blackbody of temperature 186+19 − 18 eV, slightly higher than predicted by standard cooling models; however, the best-fit neutron star atmosphere model is consistent with standard cooling. We find the bolometric luminosity L∞bb = 4+5 − 2 × 1032 erg s−1 for a distance of 4.5 kpc. We compile measurements of the temperatures of all X-ray-detected high-B pulsars as well as those of low-B radio pulsars and find evidence for the former being hotter on average than the latter.