Symbol z
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The closest anyone came to this measurement, decades before NICER existed, was Jean Cottam, Frits Paerels, and Mariano Mendez’s 2002 analysis of the bursting neutron star EXO 0748-676. Stacking twenty-eight thermonuclear X-ray bursts observed with the Chandra grating spectrometer, they reported narrow absorption features matching iron and oxygen transitions, all consistent with a single redshift of z=0.35 — a clean, quantitative result, and for several years the field’s best evidence that a neutron-star surface line could actually be resolved [ 5 ] . The claim implied a star built from ordinary nuclear matter, in a mass range of roughly 1.3 to 2.0 solar masses, and it was treated for most of…
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Equation 19 · Crossed Fields
A Neutron Star Is a Redshift Standard
This equation states an equality: the expressions on both sides have the same value under the article’s assumptions.
The closest anyone came to this measurement, decades before NICER existed, was Jean Cottam, Frits Paerels, and Mariano Mendez’s 2002 analysis of the bursting neutron star EXO 0748-676. Stacking twenty-eight thermonuclear X-ray bursts observed with the Chandra grating spectrometer, they reported narrow absorption features matching iron and oxygen transitions, all consistent with a single redshift of z=0.35 — a clean, quantitative result, and for several years the field’s best evidence that a neutron-star surface line could actually be resolved [ 5 ] . The claim implied a star built from ordinary nuclear matter, in a mass range of roughly 1.3 to 2.0 solar masses, and it was treated for most of…
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