TMRT Observations of 26 Pulsars at 8.6 GHz

TMRT Observations of 26 Pulsars at 8.6 GHz
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8.6 GHz 26 颗脉冲星的 TMRT 观测

DOI:
10.3847/1538-4357/aa8170
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发表时间:
2017-07
影响因子:
4.9
通讯作者:
Zhong Wei-Ye
Zhong Wei-Ye
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhao Ru-Shuang;Wu Xin-Ji;Yan Zhen;Shen Zhi-Qiang;Manchester R. N.;Qiao Guo-Jun;Xu Ren-Xin;Wu Ya-Jun;Zhao Rong-Bing;Li Bin;Du Yuan-Jie;Lee Ke-Jia;Hao Long-Fei;Liu Qing-Hui;Lu Ji-Guang;Shang Lun-Hua;Wang Jin-Qing;Wang Min;Yuan Jin;Zhi Qi-Jun;Zhong Wei-Ye

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给出了上海天马射电望远镜(TMRT)对26颗脉冲星的8.6 GHz综合脉冲谱图。估计了这些脉冲星的平均通量密度和脉宽参数。对于11颗脉冲星,这是第一次高频观测,对于另外4颗脉冲星,我们的观测结果比以前的观测结果有更好的信噪比。对于其中一个(PSR J0742−2822),8.6 GHz谱线与之前观测到的谱线不同。将19个剖面与其他频率的剖面进行比较表明,在9个剖面中,最外侧前导和尾导分量之间的间隔随着频率的增加而减小,这与半径-频率映射大致一致,而在其他10个剖面中,间隔几乎是恒定的。不同谱线分量的谱指数导致综合脉冲谱线形状随频率的变化。在7颗具有多分量谱线的脉冲星中,中心分量的谱线指数比外围分量的谱线指数陡。对于高频样本中具有多分量剖面的12颗脉冲星,我们利用高斯拟合估计了核心宽度,并讨论了宽度-周期关系。
Integrated pulse profiles at 8.6 GHz obtained with the Shanghai Tian Ma Radio Telescope (TMRT) are presented for a sample of 26 pulsars. Mean flux densities and pulse width parameters of these pulsars are estimated. For 11 pulsars these are the first high-frequency observations and for a further four, our observations have a better signal-to-noise ratio than previous observations. For one (PSR J0742−2822), the 8.6 GHz profile differs from previously observed profiles. A comparison of 19 profiles with those at other frequencies shows that in nine cases, the separation between the outmost leading and trailing components decreases with frequency, which is roughly in agreement with radius-to-frequency mapping, whereas in the other 10 the separation is nearly constant. Different spectral indices of profile components lead to the variation of integrated pulse profile shapes with frequency. In seven pulsars with multi-component profiles, the spectral indices of the central components are steeper than those of the outer components. For the 12 pulsars with multi-component profiles in the high-frequency sample, we estimate the core width using Gaussian fitting and discuss the width-period relationship.
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