Fig. 3
Gravitational redshift at the surface of a NS as a function of the NS mass for the Brussels-Montreal EoSs based on the EDFs BSk19-20-21, and for the SLy EoS based on the SLy4 EDF. The shaded area is excluded by general relativity and causality (Haensel et al. 2007). The horizontal band bounded by dashed lines indicates the range of redshifts inferred from the spectroscopic analysis of the gamma-ray burst GRB 790305 (Higdon & Lingenfelter 1990).
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