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Abstract

Research on the properties of neutron stars with strong magnetic fields is of great significance in constraining the equation of state and revealing the real distribution of magnetic fields in neutron stars. The main macroscopic properties of the traditional neutron star matter under βequilibrium condition are studied within the relativistic mean field theory through using the GL91 parameter set by considering the strong magnetic field. It is found that the onset of the strong magnetic field leads to the stiffened equation of state of the traditional neutron star matter. The maximum mass of the traditional neutron star grows from 2.111 M _⊙to 3.081 M _⊙, the radius of the fixed mass traditional neutron star grows larger with the increase of internal magnetic field, which makes traditional neutron star become less dense. The strong magnetic field can also reduce the surface gravitational redshift and strengthen the moment of inertia of the traditional neutron star matter. In addition, the theoretical ranges of the surface gravitational redshift and the moment of inertia for the four massive PSRs J1614-2230, J0348+0432, J0740+6620 and J2215-5135, and the 2.50 M _⊙− 2.67 M _⊙compact object in the binary merger event GW190814 are also given. The results show that the ranges of the surface redshift become narrower, while the scopes of the moment of inertia widen as the magnetizing field increases in the five stars.

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Authors and contacts

Corresponding author:Liu Cheng-Zhi,lcz@cho.ac.cn; Wang Yi-Bo,wangyb@cho.ac.cn; Xu Yan,xuy@cho.ac.cn

Funds:Project supported by the National Natural Science Foundation of China (Grant Nos. 11805022, 11803057).

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α	中子星最大质量处			中子星最大半径处
α	M/M_⊙	R/km	ρ_c/ρ₀	M/M_⊙	R/km	ρ_c/ρ₀
0	2.111	11.648	7.013	0.971	14.014	2.102
20	2.574	12.496	3.977	1.520	14.306	2.227
40	2.877	13.601	2.960	2.066	15.060	2.031
60	3.081	14.375	2.478	2.415	15.765	1.734

DownLoad: CSV

Source	α	R/km	I/M_⊙·km²	Z
PSR J1614-2230	0	[13.067, 13.158]	[131.615, 133.926]	[0.317, 0.329]
	20	[14.179, 14.220]	[148.276, 152.485]	[0.283, 0.291]
	40	[15.037, 15.048]	[161.795, 166.371]	[0.261, 0.269]
	60	[15.450, 15.670]	[172.197, 175.693]	[0.244, 0.253]
PSR J0348-0432	0	[12.548, 12.954]	[135.781, 138.653]	[0.348, 0.388]
	20	[14.108, 14.179]	[155.490, 164.997]	[0.305, 0.323]
	40	[15.048, 15.068]	[171.237, 182.428]	[0.277, 0.291]
	60	[15.690, 15.722]	[182.428, 195.897]	[0.260, 0.276]
PSR J0740+6620	0	[11.648, 12.965]	[119.641, 138.653]	[0.344, 0.462]
	20	[13.782, 14.170]	[155.490, 194.213]	[0.300, 0.416]
	40	[14.976, 15.060]	[171.237, 220.062]	[0.273, 0.361]
	60	[15.670, 15.783]	[182.428, 238.087]	[0.259, 0.334]
PSR J2215-5135	0	—	—	—
	20	[13.679, 13.986]	[180.150, 198.670]	[0.362, 0.429]
	40	[14.987, 15.037]	[199.859, 226.797]	[0.325, 0.371]
	60	[15.742, 15.783]	[215.606, 244.822]	[0.300, 0.343]
GW190814	0	—	—	—
	20	[12.496, 13.291]	[203.820, 206.593]	[0.496, 0.591]
	40	[14.670, 14.905]	[242.544, 264.431]	[0.407, 0.470]
	60	[15.670, 15.752]	[262.153, 288.002]	[0.370, 0.418]

DownLoad: CSV

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Vol. 70, Issue 22 - 2021-11-20

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