A radius is measured for the heaviest known neutron star

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X-ray timing of hot spots on the rotating surface of PSR J0740+6620, using NICER together with XMM-Newton data, produced the first radius measurement for a neutron star of about 2.08 solar masses. Two independent analyses of largely the same data reported equatorial radii near 12.4 km and near 13.7 km, a spread that matters because the mass-radius relation is the observational handle on the equation of state of matter at densities beyond nuclear saturation.

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Life of a StarSpace

Evidence · 1

The Radius of PSR J0740+6620 from NICER and XMM-Newton Data

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Neutron starassesses
Degeneracy pressureconcerns

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/atlas?object=EVT_NICER_PSR_J0740_2021