• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >THE VARIABLE RADIO-TO-X-RAY SPECTRUM OF THE MAGNETAR XTE J1810-197
【24h】

THE VARIABLE RADIO-TO-X-RAY SPECTRUM OF THE MAGNETAR XTE J1810-197

机译：电磁XTE J1810-197的可变射线X射线光谱

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have observed the 5.54 s anomalous X-ray pulsar XTE J1810-197 at radio, millimeter, and infrared (IR) wavelengths, with the aim of learning about its broadband spectrum. At the IRAM 30 m telescope, we have detected the magnetar at v = 88 and 144 GHz, the highest radio-frequency emission ever seen from a pulsar. At 88 GHz we detected numerous individual pulses, with typical widths ～2 ms and peak flux densities up to 45 Jy. Together with nearly contemporaneous observations with the Parkes, Nancay, and Green Bank telescopes, we find that in late 2006 July the spectral index of the pulsar was -0.5 (approx ＜ ) α (approx ＜ ) 0 (with flux density S_v ∝ v~α) over the range 1.4-144 GHz. Nine dual-frequency Very Large Array and Australia Telescope Compact Array observations in 2006 May-September are consistent with this finding, while showing variability of α with time. We infer from the IRAM observations that XTE J1810-197 remains highly linearly polarized at millimeter wavelengths. Also, toward this pulsar, the transition frequency between strong and weak scattering in the interstellar medium may be near 50 GHz. At Gemini, we detected the pulsar at 2.2 μm in 2006 September, at the faintest level yet observed, K_s = 21.89 ± 0.15. We have also analyzed four archival IR Very Large Telescope observations (two unpublished), finding that the brightness fluctuated within a factor of 2-3 over a span of 3 years, unlike the monotonic decay of the X-ray flux. Thus, there is no correlation between IR and X-ray flux, and it remains uncertain whether there is any correlation between IR and radio flux.
机译：我们已在无线电，毫米波和红外（IR）波长处观察到5.54 s异常X射线脉冲星XTE J1810-197，旨在了解其宽带频谱。在IRAM 30 m望远镜上，我们在v = 88和144 GHz处检测到了磁星，这是从脉冲星看到的最高射频发射。在88 GHz时，我们检测到许多单独的脉冲，典型宽度约为2 ms，峰值通量密度高达45 Jy。结合使用Parkes，Nancay和Green Bank望远镜进行的近时观测，我们发现在2006年7月下，脉冲星的光谱指数为-0.5（大约＜）α（大约＜）0（通量密度S_v v v〜 α）在1.4-144 GHz范围内。 2006年5月至9月的9次双频甚大阵列和澳大利亚望远镜紧凑阵列观测与该发现一致，同时显示了α随时间的变化。我们从IRAM的观察结果推断，XTE J1810-197在毫米波长下仍保持高度线性偏振。同样，朝着这个脉冲星，星际介质中强散射和弱散射之间的跃迁频率可能接近50 GHz。在双子座，我们在2006年9月检测到了2.2μm的脉冲星，处于尚未观测到的最微弱水平，K_s = 21.89±0.15。我们还分析了四个档案IR超大型望远镜观测结果（两个未发表），发现亮度在3年的时间范围内以2-3的倍数波动，这与X射线通量的单调衰减不同。因此，IR和X射线通量之间不存在相关性，并且IR和无线电通量之间是否存在任何相关性仍是不确定的。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号