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タイトル: Constraining the density dependence of the nuclear symmetry energy from an x-ray bursting neutron star
著者: Sotani, Hajime
Iida, Kei
Oyamatsu, Kazuhiro
著者名の別形: 祖谷, 元
発行日: Jan-2015
出版者: American Physical Society
誌名: Physical Review C
巻: 91
号: 1
論文番号: 015805
抄録: Neutrons stars lighter than the Sun are basically composed of nuclear matter of density up to around twice normal nuclear density. In our recent analyses, we showed that possible simultaneous observations of masses and radii of such neutron stars could constrain η≡(K{0}L[2])[1/3], a combination of the incompressibility of symmetric nuclear matter K{0} and the density derivative of the nuclear symmetry energy L that characterizes the theoretical mass-radius relation. In this paper, we focus on the mass-radius constraint of the x-ray burster 4U 1724-307 given by Suleimanov et al. [V. Suleimanov, J. Poutanen, M. Revnivtsev, and K. Werner, Astrophys. J. 742, 122 (2011)]. We therefrom obtain the constraint that η should be larger than around 130 MeV, which in turn leads to L larger than around 110, 98, 89, and 78 MeV for K0=180, 230, 280, and 360 MeV. Such a constraint on L is more or less consistent with that obtained from the frequencies of quasi-periodic oscillations in giant flares observed in soft gamma repeaters.
著作権等: ©2015 American Physical Society.
URI: http://hdl.handle.net/2433/196043
DOI(出版社版): 10.1103/PhysRevC.91.015805
出現コレクション:学術雑誌掲載論文等

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