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arXiv 2212.11652astro-ph.HEastro-ph.GA
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强磁化中子星的热演化和轴子发射性质

Thermal Evolution and Axion Emission Properties of Strongly Magnetized Neutron Stars

Shubham Yadav, M. Mishra, Tapomoy Guha Sarkar, Captain R. Singh

AI总结:

本文利用修正TOV方程和三种状态方程研究强磁化中子星的结构与热演化,发现强磁场显著改变冷却速率及中微子、轴子和光子光度,并使轴子质量界限略有提高。

摘要:

致密天体如中子星(NSs)的发射性质与关键的天文可观测量密切相关。在当前工作中,我们在强磁场存在下,利用修正的Tolman Oppenheimer Volkoff(TOV)方程组获得了非旋转中子星的质量和压强分布。我们通过在修正的TOV方程中使用一种特定的距离依赖磁场来得到这些分布。我们采用三种不同的状态方程(EoS)来求解TOV方程,并假设中子星的核心由强子物质组成。利用上述分布,我们使用NSCool代码确定了球对称中子星的冷却速率随时间的函数,包括和不包括磁场两种情况。我们还确定了三个不同中子星的冷却速率随半径的函数。此外,我们在存在和不存在磁场的情况下,针对轴子质量$16$ meV和三种不同的状态方程,确定了从中子星发射的中微子、轴子和光子的光度。我们的比较研究表明,由于强磁场的影响,冷却速率以及中微子、轴子和光子的光度发生了显著变化。我们还发现,由于磁场的影响,轴子质量界限与无磁场情况相比略有提高。

英文摘要:

Emission properties of compact astrophysical objects such as Neutron stars (NSs) are associated with crucial astronomical observables. In the current work, we obtain the mass, pressure profiles of the non-rotating NSs using the modified Tolman Oppenheimer Volkoff (TOV) system of equations in the presence of intense magnetic field. We obtain the profiles by using a specific distance-dependent magnetic field in the modified TOV equations. We employ three different equations of states (EoS) to solve the TOV equations by assuming the core of NSs comprises a hadronic matter. Employing the above profiles, we determine the cooling rates of spherically symmetric NSs as a function of time with and without including the magnetic field using the NSCool code. We have also determined the cooling rates as a function of radius for three different NSs. Furthermore, we determine the luminosity of neutrinos, axions, and photons emitting from the NSs in the presence and absence of a magnetic field for an axion mass $16$ meV and three different EoS. Our comparative study indicates that the cooling rate and luminosities of neutrinos, axions, and photons change significantly due to the impact of the strong magnetic field. We also find that due to the magnetic field, the axion mass bound increases slightly compared to without a magnetic field..

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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