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arXiv 2308.09469astro-ph.HEastro-ph.SRnucl-th
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2017-2018年NICER数据集PSR J0030+0451的质量-半径分析更新

An updated mass-radius analysis of the 2017-2018 NICER data set of PSR J0030+0451

Serena Vinciguerra, Tuomo Salmi, Anna L. Watts, Devarshi Choudhury, Thomas E. Riley, Paul S. Ray, Slavko Bogdanov, Yves Kini, Sebastien Guillot, Deepto Chakraba… 展开作者

Serena Vinciguerra, Tuomo Salmi, Anna L. Watts, Devarshi Choudhury, Thomas E. Riley, Paul S. Ray, Slavko Bogdanov, Yves Kini, Sebastien Guillot, Deepto Chakrabarty, Wynn C. G. Ho, Daniela Huppenkothen, Sharon M. Morsink, Zorawar Wadiasingh

AI总结:

该研究重新分析NICER数据并联合XMM-Newton数据,更新了PSR J0030+0451的质量-半径约束,发现更复杂模型支持约1.4-1.7太阳质量和11.5-14.5公里半径,且热点无需同半球或拉长,需考虑温度梯度。

摘要:

2019年,NICER合作组基于NICER观测首次推断出PSR J0030+0451的质量和半径,并由此对描述致密物质的状态方程施加了约束。两项独立分析发现其质量约为1.3-1.4个太阳质量,半径约为13公里。两项分析还发现,所有热点都位于同一半球,且朝向与观测者相反,其中至少一个热点具有显著拉长的形状。在此,我们更详细地重新分析同一NICER数据集,纳入了更新后的NICER响应矩阵的影响,并使用升级后的分析框架。我们扩展了所采用的模型,并联合分析了XMM-Newton数据,这使我们能够更好地约束来自PSR J0030+0451的观测计数比例。采用先前出版物中使用的相同模型,我们得到了一致的结果,尽管推断要求更为严格。我们还发现后验表面存在多模态结构。当考虑XMM-Newton数据时,这一点变得至关重要。纳入相应的约束后,先前发现的主要解不再受青睐,转而支持新的更复杂的模型。这些模型推断的质量和半径分别为约[1.4个太阳质量,11.5公里]和约[1.7个太阳质量,14.5公里],具体取决于所假设的模型。它们展示的构型不要求产生观测X射线的两个热点位于同一半球,也不要求显示出非常拉长的特征,而是指向温度梯度的存在以及需要考虑这些梯度的必要性。

英文摘要:

In 2019 the NICER collaboration published the first mass and radius inferred for PSR J0030+0451, thanks to NICER observations, and consequent constraints on the equation of state characterising dense matter. Two independent analyses found a mass of $\sim 1.3-1.4\,\mathrm{M_\odot}$ and a radius of $\sim 13\,$km. They also both found that the hot spots were all located on the same hemisphere, opposite to the observer, and that at least one of them had a significantly elongated shape. Here we reanalyse, in greater detail, the same NICER data set, incorporating the effects of an updated NICER response matrix and using an upgraded analysis framework. We expand the adopted models and jointly analyse also XMM-Newton data, which enables us to better constrain the fraction of observed counts coming from PSR J0030+0451. Adopting the same models used in previous publications, we find consistent results, although with more stringent inference requirements. We also find a multi-modal structure in the posterior surface. This becomes crucial when XMM-Newton data is accounted for. Including the corresponding constraints disfavors the main solutions found previously, in favor of the new and more complex models. These have inferred masses and radii of $\sim [1.4 \mathrm{M_\odot}, 11.5$ km] and $\sim [1.7 \mathrm{M_\odot}, 14.5$ km], depending on the assumed model. They display configurations that do not require the two hot spots generating the observed X-rays to be on the same hemisphere, nor to show very elongated features, and point instead to the presence of temperature gradients and the need to account for them.

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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