The surface gravitational redshift of the massive neutron star PSR J0348+0432

 

Xian-Feng Zhao¹ and Huan-Yu Jia²

 

¹ College of Mechanical and Electronic Engineering, Chuzhou University, Chuzhou, 239000, China. (zhaopioneer.student@sina.com).

² Institute for Modern Physics, Southwest Jiaotong University, Chengdu 610031, China. (hyjia@home.swjtu.edu.cn).

 

Received 2013 October 30.
Accepted 2013 December 18.

 

RESUMEN

Se calcula el corrimiento al rojo gravitatorio en la superficie de la estrella neutrón masiva PSR J0348+0432 en el marco de la teoria relativista de campo medio, escogiendo adecuadamente las constantes de acoplamiento para los hiperones. Se encuentra que el intervalo de valores para el radio y el corrimiento al rojo gravitatorio en la superficie de PSR J0348+0432 es de 12.062–12.957 km y 0.3473–0.04064, respectivamente. Según nuestros cálculos, los valores para el radio y el corrimiento al rojo gravitatorio para una estrella neutrón de masa canónica son de 13.245 km y 0.2226, respectivamente. Así, el corrimiento al rojo gravitatorio de PSR J0348+0432 resulta ser 1.56–1.8 veces mayor que el de la estrella neutrón de masa canónica.

 

ABSTRACT

The surface gravitational redshift of the massive neutron star PSR J0348+0432 is calculated in the framework of the relativistic mean field theory by choosing the suitable hyperon coupling constants. It is found that the value ranges of the radius and the surface gravitational redshift of the massive neutron star PSR J0348+0432 are determined as 12.062–12.957 km and 0.3473–0.4064, respectively. In our calculations, the radius and the surface gravitational redshift of the canonical mass neutron star are, respectively 13.245 km and 0.2226. So, the surface gravitational red shift of the massive neutron star PSRJ 0348+0432 is about 1.56–1.8 times larger than that of the canonical mass neutron star.

Key Words: elementary particles — gravitation — stars: neutron.

 

DESCARGAR ARTÍCULO EN FORMATO PDF

 

ACKNOWLEDGMENTS

This work was supported by the Scientific Research Program Foundation of the Higher Education Institutions of Anhui Province "Study on the massive neutron star PSR J0348+0432 in the framework of relativistic mean field theory", the Anhui Provincial Natural Science Foundation under grant 1208085MA09 and the Fundamental Research Funds for the Central Universities under grant SWJTU12ZT11.

 

REFERENCES

Antoniadis, J., et al. 2013, Nature, 340, 448        [ Links ]

Astashenok, A. V., Capozziello, S., & Odintsov, S. D. 2013, J. Cosmology Astroparticle Phys., 12, id. 040        [ Links ]

Batty, C. J., Friedman, E., & Gal, A. 1997, Phys.Reports, 287, 385        [ Links ]

Friedman, E., & Gal, A. 2007, Phys. Reports, 452, 89        [ Links ]

Glendenning, N. K. 1985, ApJ, 293, 470        [ Links ]

----------. 1997, Compact Stars: Nuclear Physics, Particle Physics, and General Relativity (New York: Springer)        [ Links ]

Glendenning, N. K., & Moszkowski, S. A. 191, Phys. Rev. Lett., 67, 2414        [ Links ]

Harada, T., & Hirabayashi, Y. 2005, Nucl. Phys. A, 759, 143        [ Links ]

----------. 2006, Nucl. Phys. A, 767, 206        [ Links ]

Kohno, M., Fujiwara, Y., Watanabe, Y., Ogata, K., & Kawai, M. 2006, Phys. Rev. C, 74, id. 064613        [ Links ]

Liang, E. P. 1986, ApJ, 304, 682        [ Links ]

Özel, F., Psaltis, D., Ransom, S., Demorest, P., & Alford, M. 2010, ApJ, 724, L199        [ Links ]

Schaffner, J., & Mishustin, I.N. 1996, Phys. Rev. C, 53, 1416        [ Links ]

Schaffner-Bielich, J., & Gal, A. 2000, Phys. Rev. C, 62, id. 034311        [ Links ]

Zhao, X.-F. 2011, Ap & SS, 332, 139        [ Links ]

Zhao, X.-F., & Jia, H.-Y. 2012, Phys. Rev. C, 85, id. 065806        [ Links ]