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HIGH TIME RESOLUTION INFRARED OBSERVATIONS OF THE CRAB NEBULA PULSAR AND THE PULSAR EMISSION MECHANISM

机译:蟹状星云脉冲的实时高分辨率红外观测及脉冲星的发射机理

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We present new, high signal-to-noise near-infrared observations of the Crab Nebula pulsar using the Solid State Photomultiplier instrument on the Multiple Mirror Telescope. Our observations cover the J (1.25 μm), H (1.65 μm), and K (2.2 μm) infrared wavebands and have 20 μs tune resolution. Together with visible and UV observations made by the Hubble Space Telescope High-Speed Photometer, we have high time resolution observations covering over a decade in wavelength. We present the pulse profiles over this wavelength range, and we analyze the pulse shape as a function of wavelength, including the peak-to-peak phase separation, the peak full width half-maxima (FWHM), and the peak half-width half-maxima (HWHM). We also create both phase-averaged and phase-resolved color spectra of the pulsar emission. We find that the peak-to-peak phase separation shows a significant trend for an increase with wavelength, in rough agreement with models of the pulsar emission mechanism. The FWHM for peaks 1 and 2 also show a trend for increase with wavelength, again in qualitative agreement with the models. However, the HWHM for peaks 1 and 2 show significant differences in their wavelength dependences from the leading to trailing edges. This behavior is not predicted by current pulsar emission models, and the different wavelength dependences of the component HWHM values call into question the usefulness of FWHM measurements. Our spectral analyses show that the IR-UV dereddened phase-averaged color spectrum is essentially flat over more than a decade in frequency. This is in clear contrast to the X-ray and γ-ray regimes, where the spectrum is falling steeply. The color spectra of peaks 1 and 2 are also essentially flat, but the ratio of the two shows statistically significant variations from a constant value. Finally, the color spectra of peaks 1 and 2 show significant differences from the leading to trailing edges. As with the HWHM, this behavior is not predicted by current pulsar emission models.
机译:我们使用多镜望远镜上的固态光电倍增器仪器,对蟹状星云脉冲星提出了新的,高信噪比的近红外观测结果。我们的观测结果涵盖了J(1.25μm),H(1.65μm)和K(2.2μm)红外波段,并且具有20μs的调谐分辨率。结合哈勃太空望远镜高速光度计进行的可见光和紫外线观测,我们可以获得涵盖十多年来波长的高分辨率观测。我们介绍了在该波长范围内的脉冲分布,并分析了脉冲形状与波长的关系,包括峰-峰相分离,峰全宽半峰(FWHM)和峰半宽半峰-最大值(HWHM)。我们还创建脉冲星发射的均相和相分辨色谱。我们发现峰峰值相分离显示出随波长增加的显着趋势,这与脉冲星发射机制的模型大致吻合。峰1和峰2的FWHM也显示出随波长增加的趋势,再次与模型定性一致。但是,峰1和峰2的HWHM在从前缘到后缘的波长依赖性方面显示出显着差异。当前的脉冲星发射模型无法预测这种行为,并且分量HWHM值的不同波长依赖性使人质疑FWHM测量的有用性。我们的光谱分析表明,经过十多年的测试,IR-UV去色相平均的光谱基本上是平坦的。这与光谱急剧下降的X射线和γ射线形式形成鲜明对比。峰1和2的色谱图也基本上是平坦的,但两者的比率显示出与恒定值相比在统计上显着变化。最后,峰1和2的色谱图显示出从前缘到后缘的显着差异。与HWHM一样,当前的脉冲星发射模型无法预测这种行为。

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