A NEW ELECTRON-DENSITY MODEL FOR ESTIMATION OF PULSAR AND FRB DISTANCES

A NEW ELECTRON-DENSITY MODEL FOR ESTIMATION OF PULSAR AND FRB DISTANCES
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用于估计脉冲星和FRB距离的新电子密度模型

DOI:
10.3847/1538-4357/835/1/29
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发表时间:
2016-10
影响因子:
4.9
通讯作者:
Wang N.
Wang N.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Yao J. M.;Manchester R. N.;Wang N.

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我们提出了银河系、麦哲伦星云和星系间介质(IGM)中自由电子分布的新模型,该模型可用于根据色散测量(DM)估计到真实或模拟脉冲星和快速射电暴(frb)的距离。银河模型有一个扩展的厚盘代表所谓的温暖星际介质,一个薄盘代表银河分子环,螺旋臂基于最近适合银河H区,银河中心盘,以及七个局部特征,包括口香糖星云,银河环I和局部气泡。太阳与银河系平面的偏移和银河系外盘的翘曲都包含在模型中。银河系模型的参数是通过拟合189颗脉冲星来确定的,这些脉冲星具有独立确定的距离和dm。简单的模型用于麦哲伦云和IGM。星系模型距离在189个独立确定的距离中有86个在不确定范围内,另外38个脉冲星的距离在最近限制的20%之内。我们估计95%的银河系脉冲星距离预测的相对误差将小于0.9。将YMW16的预测结果与TC93和NE2001模型的预测结果进行了比较,表明YMW16在所有指标上的表现都明显更好。估计了(真实的或模拟的)银河系和麦哲伦星云脉冲星和快速射电暴的星际散射引起的脉冲展宽的时间尺度。
We present a new model for the distribution of free electrons in the Galaxy, the Magellanic Clouds, and the intergalactic medium (IGM) that can be used to estimate distances to real or simulated pulsars and fast radio bursts (FRBs) based on their dispersion measure (DM). The Galactic model has an extended thick disk representing the so-called warm interstellar medium, a thin disk representing the Galactic molecular ring, spiral arms based on a recent fit to Galactic H ii regions, a Galactic Center disk, and seven local features including the Gum Nebula, Galactic Loop I, and the Local Bubble. An offset of the Sun from the Galactic plane and a warp of the outer Galactic disk are included in the model. Parameters of the Galactic model are determined by fitting to 189 pulsars with independently determined distances and DMs. Simple models are used for the Magellanic Clouds and the IGM. Galactic model distances are within the uncertainty range for 86 of the 189 independently determined distances and within 20% of the nearest limit for a further 38 pulsars. We estimate that 95% of predicted Galactic pulsar distances will have a relative error of less than a factor of 0.9. The predictions of YMW16 are compared to those of the TC93 and NE2001 models showing that YMW16 performs significantly better on all measures. Timescales for pulse broadening due to interstellar scattering are estimated for (real or simulated) Galactic and Magellanic Cloud pulsars and FRBs.
DOI: 10.1088/0004-637x/806/1/120
发表时间: 2015-06
期刊: The Astrophysical Journal
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发表时间: 1991-11
期刊: Nature
影响因子: 64.8
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DOI: --
发表时间: 2003-01
期刊: arXiv: Astrophysics
影响因子: --
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DOI: 10.1007/978-94-010-3087-8_26
发表时间: 1971
期刊: --
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通讯作者: M. Large