EXTRACTING HOST GALAXY DISPERSION MEASURE AND CONSTRAINING COSMOLOGICAL PARAMETERS USING FAST RADIO BURST DATA
EXTRACTING HOST GALAXY DISPERSION MEASURE AND CONSTRAINING COSMOLOGICAL PARAMETERS USING FAST RADIO BURST DATA
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DOI：
10.3847/2041-8205/830/2/l31
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发表时间：
2016-08
期刊：
影响因子：
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通讯作者：
Yuanpei Yang;Bing Zhang
中科院分区：
文献类型：
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作者：
Yuanpei Yang;Bing Zhang
快速射电暴（FRB）的过度色散测量（DM）和高银河纬度暗示了这些神秘瞬变的宇宙学起源。利用测量的DM和红移z来研究宇宙学的方法已经被提出，但是为了应用这些方法，需要假设宿主星系（）有一定量的DM贡献。我们引入了一个斜率参数（其中是所观察到的DM减去银河系的贡献），这可以直接测量时，FRB的样本有z测量。我们表明，这可以从样本的β和平均值以及粗略推断。通过Monte Carlo模拟，我们发现局域宿主星系DM，的平均值沿着与其他宇宙学参数（ΛCDM模型中的质量密度和重子能量密度的IGM部分）一起，可以通过马尔可夫链Monte Carlo拟合数据独立地测量。
The excessive dispersion measures (DMs) and high Galactic latitudes of fast radio bursts (FRBs) hint toward a cosmological origin of these mysterious transients. Methods of using measured DM and redshift z to study cosmology have been proposed, but one needs to assume a certain amount of DM contribution from the host galaxy ( ) in order to apply those methods. We introduce a slope parameter (where is the observed DM subtracting the Galactic contribution), which can be directly measured when a sample of FRBs have z measured. We show that can be roughly inferred from β and the mean values, and , of the sample. Through Monte Carlo simulations, we show that the mean value of local host galaxy DM, , along with other cosmological parameters (mass density in the ΛCDM model, and the IGM portion of the baryon energy density ), can be independently measured through Markov Chain Monte Carlo fitting to the data.