Статья

PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter

M. Coleman MillerDepartment of Astronomy and Joint Space-Science Institute, University of Maryland, College Park, MD 20742-2421 USA; [email protected]Frederick K. LambCenter for Theoretical Astrophysics and Department of Physics, University of Illinois at Urbana-Champaign, 1110 West Green Street, Urbana, IL 61801-3080, USAA. J. DittmannDepartment of Astronomy and Joint Space-Science Institute, University of Maryland, College Park, MD 20742-2421 USA; [email protected]S. BogdanovColumbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USAZ. ArzoumanianX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USAK. C. GendreauX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USASébastien GuillotIRAP, CNRS, 9 avenue du Colonel Roche, BP 44346, F-31028 Toulouse Cedex 4, FranceA. K. HardingAstrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAW. C. G. HoDepartment of Physics and Astronomy, Haverford College, 370 Lancaster Avenue, Haverford, PA 19041, USAJames M. LattimerDepartment of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794-3800, USAR. M. LudlamCahill Center for Astronomy and Astrophysics, California Institute of Technology, Pasadena, CA 91125, USAS. MahmoodifarAstrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USASharon M. MorsinkDepartment of Physics, University of Alberta, 4-183 CCIS, Edmonton, AB T6G 2E1, CanadaPaul S. RaySpace Science Division, U.S. Naval Research Laboratory, Washington, DC 20375, USATod E. StrohmayerJoint Space Science InstituteK. S. WoodPraxis, resident at the U.S. Naval Research Laboratory, Washington, DC 20375, USATeruaki EnotoThe Hakubi Center for Advanced Research and Department of Astronomy, Kyoto University, Kyoto 606-8302, JapanR. FosterMIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA, USAT. OkajimaX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USAG. PrigozhinMIT Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology, 70 Vassar Street, Cambridge, MA, USAY. SoongX-Ray Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 662, Greenbelt, MD 20771, USA

2019en

ABI

Аннотация

Abstract Neutron stars are not only of astrophysical interest, but are also of great interest to nuclear physicists because their attributes can be used to determine the properties of the dense matter in their cores. One of the most informative approaches for determining the equation of state (EoS) of this dense matter is to measure both a star’s equatorial circumferential radius R e and its gravitational mass M . Here we report estimates of the mass and radius of the isolated 205.53 Hz millisecond pulsar PSR J0030+0451 obtained using a Bayesian inference approach to analyze its energy-dependent thermal X-ray waveform, which was observed using the Neutron Star Interior Composition Explorer ( NICER ). This approach is thought to be less subject to systematic errors than other approaches for estimating neutron star radii. We explored a variety of emission patterns on the stellar surface. Our best-fit model has three oval, uniform-temperature emitting spots and provides an excellent description of the pulse waveform observed using NICER . The radius and mass estimates given by this model are km and (68%). The independent analysis reported in the companion paper by Riley et al. explores different emitting spot models, but finds spot shapes and locations and estimates of R e and M that are consistent with those found in this work. We show that our measurements of R e and M for PSR J0030+0451 improve the astrophysical constraints on the EoS of cold, catalyzed matter above nuclear saturation density.

Перевод пока недоступен

Идентификаторы

DOI: 10.3847/2041-8213/ab50c5

Цитирования и источники

Цитирований: 7Использованных источников: 0

Показатели — AkademScholar