2023/10/01 by Tian Xiao, Jia-Lun Li, Tian, Xiao +11 · 1 citation
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics and Cosmic Phenomena #Cosmology and Nongalactic Astrophysics (astro-ph.CO) #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · pdf · doi:10.48550/arxiv.2310.00596
openalex publication_date 2023/10/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The plateau phase in the radio afterglows has been observed in very few gamma-ray bursts (GRBs), and 27 radio light curves with plateau phase were acquired from the published literature in this article. We obtain the related parameters of the radio plateau, such as temporal indexes during the plateau phase (α1 and α2), break time (\Tbz) and the corresponding radio flux (F\rm b). The two parameter Dainotti relation between the break time of the plateau and the corresponding break luminosity (\Lbz) in radio band is \Lbz ∝ \Tbz-1.20±0.24. Including the isotropic energy \Eiso and the peak energy \Epi, the three parameter correlations for the radio plateaus are written as \Lbz ∝ \Tbz-1.01 ± 0.24 \Eiso0.18 ± 0.09 and \Lbz ∝ \Tbz-1.18 ± 0.27 \Epi0.05 ± 0.28, respectively. The correlations are less consistent with that of X-ray and optical plateaus, implying that radio plateaus may have a different physical mechanism. The typical frequencies crossing the observational band may be a reasonable hypothesis that causes the breaks of the radio afterglows. We calibrate GRBs empirical luminosity correlations as standard candle for constraining cosmological parameters, and find that our samples can constrain the flat ΛCDM model well, while are not sensitive to non-flat ΛCDM model. By combining GRBs with other probes, such as SN and CMB, the constraints on cosmological parameters are \om = 0.297±0.006 for the flat ΛCDM model and \om = 0.283±0.008, \oL = 0.711±0.006 for the non-flat ΛCDM model, respectively.