PSR B0823 +26同步X射线和射电模的发现
Discovery of synchronous X-ray and radio moding of PSR B0823+26
摘要：
与欧空局的XMM-牛顿、巨型米波射电望远镜和低频阵列的国际站同时观测PSR B 0823 +26，发现X射线/射电在射电亮（B）模式和射电静（Q）模式之间同步切换。在B模式期间，我们在0.2 $-$ 2 keV X射线中检测到PSR B 0823 +26，并发现具有宽正弦脉冲的脉冲发射，在相位上滞后于射电主脉冲0.208 $\pm$ 0.012，高脉冲分数为70 $-$ 80%。在Q模式期间，在X射线中未检测到PSR B 0823 +26（2 $σ$上限比B模式通量低约9倍）。总的X射线光谱、脉冲轮廓和脉冲分数可以用具有三个发射分量的磁化部分电离氢大气模型全局地再现：一个主要的小热点（$T$ $\sim$ 3.6 $\times10^6$ K，$R$ $\sim$ 17 m），较大的冷却器同心环（$T$ $\sim$ 1.1 $\times10^6$ K，$R$ $\sim$ 280 m）和对映热点（$T$ $\sim$ 1.1 $\times10^6 $ K，$R$ $\sim$ 100 m），用于旋转轴和视线方向$\sim66^\circ$之间的角度。后者与$(84\pm0.7)^\circ$的无线电导出值相冲突。平均X射线通量在数小时长的B-模式间隔内变化的因子为$\pm$ 20%，这可能与短射电空值或短持续时间弱发射的频率和长度的变化有关。比较了PSR B 0823 +26的相关X射线/射电模与PSR B 0943 +10的反相关模以及PSR B1822-09的X射线模的缺失。我们推测PSR B 0823 +26的X射线/射电开关是由于它所经过的星际介质中物质吸积速率的变化。
英文摘要：
Simultaneous observations of PSR B0823+26 with ESA's XMM-Newton, the Giant Metrewave Radio Telescope and international stations of the Low Frequency Array revealed synchronous X-ray/radio switching between a radio-bright (B) mode and a radio-quiet (Q) mode. During the B mode we detected PSR B0823+26 in 0.2$-$2 keV X-rays and discovered pulsed emission with a broad sinusoidal pulse, lagging the radio main pulse by 0.208 $\pm$ 0.012 in phase, with high pulsed fraction of 70$-$80%. During the Q mode PSR B0823+26 was not detected in X-rays (2 $σ$ upper limit a factor ~9 below the B-mode flux). The total X-ray spectrum, pulse profile and pulsed fraction can globally be reproduced with a magnetized partially ionized hydrogen atmosphere model with three emission components: a primary small hot spot ($T$$\sim$3.6$\times10^6$ K, $R$$\sim$17 m), a larger cooler concentric ring ($T$$\sim$1.1$\times10^6$ K, $R$$\sim$280 m) and an antipodal hot spot ($T$$\sim$1.1$\times10^6 $ K, $R$$\sim$100 m), for the angle between the rotation axis and line of sight direction $\sim66^\circ$. The latter is in conflict with the radio derived value of $(84\pm0.7)^\circ$. The average X-ray flux within hours-long B-mode intervals varied by a factor $\pm$20%, possibly correlated with variations in the frequency and lengths of short radio nulls or short durations of weak emission. The correlated X-ray/radio moding of PSR B0823+26 is compared with the anti-correlated moding of PSR B0943+10, and the lack of X-ray moding of PSR B1822-09. We speculate that the X-ray/radio switches of PSR B0823+26 are due to variations in the rate of accretion of material from the interstellar medium through which it is passing.
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