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arXiv 1901.01673astro-ph.SRastro-ph.HE
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在中子星和黑洞遗迹之间的沙漠上

On the desert between neutron star and black hole remnants

R. Caimmi

摘要:

评述了中子星(NS)和黑洞(BH)遗迹之间沙漠的存在。从最近的调查和进一步的努力是致力于NS和BH残余的恒星残余物上的零年龄主序(ZAMS)祖质量的太阳金属丰度的依赖。特别地,定义了密度参数,并将其与NS质量和半径相关。克尔度规中的自旋黑洞被认为是牛顿力学中的无限薄、均匀、刚性旋转的圆盘。根据最近对4个NS和3个夸克星(QS)物理激发的物态方程(EOS)的研究,给出了非旋转(TOV)和赤道分裂(EQB)组态的物理参数。进行了比较与同行有关的非旋转和最大旋转BH。结果也被认为是在文献中存在的经验关系。关于$J$ - $M$关系,与最大旋转BH相比,EQB配置被放置在类似斜率的序列上,但是由于较低的角动量而向下移动约3.6倍。在假设重子是NS组分并瞬时经历夸克级反应的情况下,利用最近的研究结果计算了释放(或吸附)的能量。即使NS只容纳所考虑的重子,总量也不能超过结合能的10%,这抑制了超新星爆炸,如超大质量白矮星(WD)残留物或坍缩成BH。次大质量($2<=M/m_\odot<=4$)BH形成的替代渠道进行了简短的讨论。

英文摘要:

The occurrence of a desert between neutron star (NS) and black hole (BH) remnants is reviewed. The dependence of stellar remnants on the zero age main sequence (ZAMS) progenitor mass for solar metallicity is taken from a recent investigation and further effort is devoted to NS and BH remnants. In particular, a density parameter is defined and related to NS mass and radius. Spinning BHs in Kerr metrics are considered as infinitely thin, homogeneous, rigidly rotating disks in Newtonian mechanics. Physical parameters for nonrotating (TOV) and equatorial breakup (EQB) configurations are taken or inferred from a recent investigation with regard to 4 NS and 3 quark star (QS) physically motivated equation of state (EOS) kinds. A comparison is performed with counterparts related to nonrotating and maximally rotating BHs. The results are also considered in the light of empirical relations present in literature. With regard to $J$-$M$ relation, EQB configurations are placed on a sequence of similar slope in comparison to maximally rotating BHs, but shifted downwards due to lower angular momentum by a factor of about 3.6. Under the assumption heavy baryons are NS constituents and instantaneously undergo quark-level reactions, the energy released (or adsorbed) is calculated using results from a recent investigation. Even if NSs exclusively host heavy baryons of the kind considered, the total amount cannot exceed about 10\% of the binding energy, which inhibits supernova explosions as in supramassive white dwarf (WD) remnants or implosions into BH. Alternative channels for submassive ($2<=M/m_\odot<=4$) BH formation are shortly discussed.

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