Fast Transients at Cosmological Distances with the SKA
Fast Transients at Cosmological Distances with the SKA
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DOI：
10.22323/1.215.0055
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发表时间：
2015-01
期刊：
影响因子：
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通讯作者：
J. Macquart;E. Keane;K. Grainge;M. McQuinn;Rob Fender;J. Hessels;A. Deller;Ramesh Bhat;Rene P. Breton;S. Chatterjee;C. Law;D. Lorimer;E. Ofek;M. Piętka;L. Spitler;B. Stappers;C. Trott
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文献类型：
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作者：
J. Macquart;E. Keane;K. Grainge;M. McQuinn;Rob Fender;J. Hessels;A. Deller;Ramesh Bhat;Rene P. Breton;S. Chatterjee;C. Law;D. Lorimer;E. Ofek;M. Piętka;L. Spitler;B. Stappers;C. Trott
在宇宙学距离上都可以探测到的脉冲射电暴，构成了对电离星系间介质（IGM）、星系间磁场和时空本身性质的极其强大的探测。他们的色散测量（DM）将使我们能够检测到低红移宇宙中“失踪”的重子，并首次测量平均星系晕轮廓，这是星系形成和反馈模型中的一个关键参数。脉冲爆发在红移超过2时可以作为宇宙的标尺，并在红移超过Ia型超新星容易达到的范围时限制暗能量状态方程参数w（z）。这两个目标都是可以实现的样本1004快速射电暴（FRB）的位置定位在一个角秒内，足以获得主机星系通过光学跟踪红移。也有人假设，引力波事件可能在SKA 1-LOW探测到的频率上发出相干辐射，而这些事件在宇宙学距离上的定位将使它们能够用作宇宙学标准警报器。
Impulsive radio bursts that are detectable across cosmological distances constitute extremely powerful probes of the ionized Inter-Galactic Medium (IGM), intergalactic magnetic fields, and the properties of space-time itself. Their dispersion measures (DMs) will enable us to detect the “missing” baryons in the low-redshift Universe and make the first measurements of the mean galaxy halo profile, a key parameter in models of galaxy formation and feedback. Impulsive bursts can be used as cosmic rulers at redshifts exceeding 2, and constrain the dark energy equation-ofstate parameter, w(z) at redshifts beyond those readily accessible by Type Ia SNe. Both of these goals are realisable with a sample of∼ 104 fast radio bursts (FRBs) whose positions are localized to within one arcsecond, sufficient to obtain host galaxy redshifts via optical follow-up. It is also hypothesised that gravitational wave events may emit coherent emission at frequencies probed by SKA1-LOW, and the localization of such events at cosmological distances would enable their use as cosmological standard sirens.