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Equation 11 · Part 1 · A Neutron Star Is a Redshift Standard

Symbol R

R=11.36−0.63+0.95R=11.36^{+0.95}_{-0.63}
RR

What this part means

R is part of the quantity the equation computes from the expression on the right.

Its job in the formula

R is part of the quantity the equation computes from the expression on the right.

The passage around this formula

— a function of the star’s compactness alone, so that whatever fraction of a percent of uncertainty NICER puts on M and R propagates directly into the redshift. The paper works through six NICER-mapped pulsars this way, and two of them mark the range worth remembering. PSR J0740+6620, the most massive precisely-timed neutron star known, comes in at roughly 2.07\,M⊙M_\odot with a radio-timing mass fixed independently…

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Learn the underlying idea

A variable is a named place for a value. Its letter is a local label: x can mean position in one formula and a data point in another.

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Sources cited in the surrounding passage

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