articleThe Astrophysical JournalJan 1, 2024GOLD OA

An Updated Mass–Radius Analysis of the 2017–2018 NICER Data Set of PSR J0030+0451

SVS. VinciguerraTSTuomo SalmiALAnna L. WattsDCDevarshi ChoudhuryTEThomas E. Riley

Astronomical Institute of the Slovak Academy of Sciences · University of Amsterdam · +12 more institutions

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Abstract

Abstract 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 characterizing dense matter. Two independent analyses found a mass of ∼1.3–1.4 M ⊙ and a radius of ∼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 reanalyze, 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 also jointly analyze XMM-Newton data, which…

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Keywords
  • Physics
  • RADIUS
  • Astrophysics
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