Potential biases and prospects for the Hubble constant estimation via electromagnetic and gravitational-wave joint analyses

Potential biases and prospects for the Hubble constant estimation via electromagnetic and gravitational-wave joint analyses
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通过电磁波和引力波联合分析估计哈勃常数的潜在偏差和前景

DOI:
10.1093/mnras/stae198
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发表时间:
2024
影响因子:
4.8
通讯作者:
Gianfagna G
Gianfagna G
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Gianfagna G

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GW 170817是一颗双中子星星并合,它表现出引力波(GW)和伽马射线爆发,然后是余辉。在这项工作中,我们估计哈勃常数(H 0)使用宽带余辉发射和相对论喷流运动的甚长基线干涉和HST图像的GW 170817。与以前的尝试相比,我们结合联合收割机这些信使与GW在一个同步贝叶斯拟合。我们探测的H 0测量的鲁棒性取决于所使用的数据集,假设的射流模型,可能存在的后期通量过剩。由于视角(θv)和光度距离(dL)之间的简并性,使用唯一的GW会导致20%的误差(,中位数,16 - 84分位数)。后者通过在余辉光变曲线的拟合中包括而减少,导致大的值,这是由于可能存在余辉通量中的后期过量而导致的对高视角的拟合偏好造成的。通过在后期包括恒定通量分量来考虑后者带来。在分析中加入质心运动有效地打破了dL − θ v简并克服了后期偏差,给出(与普朗克和SH 0 ES测量一致)和°。这是有效的,不管射流结构的假设。我们的模拟表明,下一个GW运行无线电观测预计将提供最多其他几个类似的事件。
GW170817 is a binary neutron star merger that exhibited a gravitational wave (GW) and a gamma-ray burst, followed by an afterglow. In this work, we estimate the Hubble constant (H0) using broad-band afterglow emission and relativistic jet motion from the Very Long Baseline Interferometry andHSTimages of GW170817. Compared to previous attempts, we combine these messengers with GW in a simultaneous Bayesian fit. We probe theH0measurement robustness depending on the data set used, the assumed jet model, the possible presence of a late time flux excess. Using the sole GW leads to a 20 per cent error (, medians, 16th–84th percentiles), because of the degeneracy between viewing angle (θv) and luminosity distance (dL). The latter is reduced by the inclusion in the fit of the afterglow light curve, leading to, a large value, caused by the fit preference for high viewing angles due to the possible presence of a late-time excess in the afterglow flux. Accounting for the latter by including a constant flux component at late times brings. Adding the centroid motion in the analysis efficiently breaks, thedL− θvdegeneracy and overcome the late-time deviations, giving(in agreement withPlanckand SH0ES measurements) and°. This is valid regardless of the jet structure assumption. Our simulations show that for next GW runs radio observations are expected to provide at most few other similar events.
基于 LIGO/Virgo 公共警报的电磁对应搜索的数据驱动预期:O5 模拟
DOI: --
发表时间: 2021
期刊:
影响因子: --
作者:
L. Singer
通讯作者: L. Singer
拆开合并喷气机:GW170817、GW190425 的贝叶斯分析和短伽马射线爆发的电磁观测
DOI: --
发表时间: 2023
影响因子: 4.9
作者:
F. Hayes;I. Heng;G. Lamb;E. Lin;J. Veitch;Michael J. Williams
通讯作者: Michael J. Williams
DOI: --
发表时间: 2023
期刊:
影响因子: --
作者:
C. Bom;A. Palmese
通讯作者: A. Palmese