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
复制标题
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
中科院分区:
文献类型:
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作者:
Gianfagna G
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.
DOI:
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发表时间:
2021
期刊:
影响因子:
--
作者:
L. Singer
通讯作者:
L. Singer
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:
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发表时间:
2023
期刊:
影响因子:
--
作者:
C. Bom;A. Palmese
通讯作者:
A. Palmese