Work

Explaining high braking indices of magnetars SGR 0501+4516 and 1E 2259+586 using the double magnetic‐dipole model

Year: 2021

Type: article

Abstract: In this paper, we attribute high braking indicesn > 3of two magnetars SGR 0501+4516 and 1E 2259+586 to the decrease in their inclination angles using the double magnetic‐dipole model proposed by Hamil et al. (2016). In this model, there are two magnetic moments inside a neutron star—one is generated by the rotation effect of a charged sphere,M1, and the other is generated by the magnetization of ferromagnetically ordered material,M2. Our calculations indicate that the magnetic momentM2would evolve toward alignment with the spin axis of the two magnetars and cause their magnetic inclination angles to decrease. We also define a ratioη = M2/M1, which reflects the magnetization degree, and find that the values ofηof the two magnetars are about two orders of magnitude higher than that of rotationally powered pulsar PSR J1640‐4631 withn = 3.15(3), assuming that they have the same rate of decrease in their inclination angles.

Source: Astronomische Nachrichten

DOI: 10.1002/asna.202113913

Authors: Fang‐Zhou Yan, Zhi‐Fu Gao, Wen‐Shen Yang, Ai‐Jun Dong

Institutions: Chinese Academy of Sciences, Xinjiang Astronomical Observatory, University of Chinese Academy of Sciences, Guizhou Normal University

Language: English

Topic: Pulsars and Gravitational Waves Research

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: National Natural Science Foundation of China

Awards: G1612087943, 喷流和盘风物理研究, G7154445955