Calibrating the Cosmic Distance Ladder Using Gravitational-wave Observations
Calibrating the Cosmic Distance Ladder Using Gravitational-wave Observations
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DOI：
10.3847/1538-4357/ab4c92
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发表时间：
2019-07
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影响因子：
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通讯作者：
Anuradha Gupta;D. Fox;B. Sathyaprakash;B. Schutz
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文献类型：
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作者：
Anuradha Gupta;D. Fox;B. Sathyaprakash;B. Schutz
Ia型超新星（SNe Ia）是精确宇宙学的杰出距离阶梯之一，因为它们的内在亮度，这使得它们可以在高红移下观察到。然而，它们作为绝对宇宙学距离的无偏估计的有用性取决于对它们内在亮度的准确理解，或者锚定它们的距离尺度。这些知识是基于校准它们与造父变星的距离。来自紧密双星合并的引力波，作为标准的警报器，可以用来验证当两者都发生在同一个星系或星系团时到超新星Ia的距离。目前由先进的LIGO和Virgo探测器网络进行的距离测量存在很大的统计误差（约50%）。然而，我们发现，使用第三代引力波探测器网络，标准警报器将使我们能够测量≤300 Mpc的源的距离，精度为10.1%-3%。这些都是远远小于主导的系统误差的0.5%，由于径向特有的速度的宿主星系。因此，引力波观测可能很快会为独立校准Ia超新星的距离增加一个新的宇宙距离阶梯。
Type Ia supernovae (SNe Ia) are among the pre-eminent distance ladders for precision cosmology due to their intrinsic brightness, which allows them to be observable at high redshifts. Their usefulness as unbiased estimators of absolute cosmological distances, however, depends on accurate understanding of their intrinsic brightness, or anchoring their distance scale. This knowledge is based on calibrating their distances with Cepheids. Gravitational waves from compact binary coalescences, being standard sirens, can be used to validate distances to SNe Ia when both occur in the same galaxy or galaxy cluster. The current measurement of distance by the advanced LIGO and Virgo detector network suffers from large statistical errors (∼50%). However, we find that, using a third-generation gravitational-wave detector network, standard sirens will allow us to measure distances with an accuracy of ∼0.1%–3% for sources within ≤300 Mpc. These are much smaller than the dominant systematic error of ∼5% due to the radial peculiar velocity of host galaxies. Therefore, gravitational-wave observations could soon add a new cosmic distance ladder for an independent calibration of distances to SNe Ia.