Rejecting proposed dense-matter equations of state with quiescent low-mass X-ray binaries
| Autor: | Sebastien Guillot, Robert E. Rutledge |
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| Rok vydání: | 2014 |
| Předmět: |
Physics
High Energy Astrophysical Phenomena (astro-ph.HE) Equation of state FOS: Physical sciences Astronomy and Astrophysics Astrophysics Radius Nuclear matter Stars Neutron star Space and Planetary Science Binary star Neutron Astrophysics - High Energy Astrophysical Phenomena Nuclear density Astrophysics::Galaxy Astrophysics |
| DOI: | 10.48550/arxiv.1409.4306 |
| Popis: | Neutrons stars are unique laboratories to discriminate between the various proposed equations of state of matter at and above nuclear density. One sub-class of neutron stars - those inside quiescent low-mass X-ray binaries (qLMXBs) - produce a thermal surface emission from which the neutron star radius (R_NS) can be measured, using the widely accepted observational scenario for qLMXBs, assuming unmagnetized H atmospheres. In a combined spectral analysis, this work first reproduces a previously published measurement of the \rns, assumed to be the same for all neutron stars, using a slightly expanded data set. The radius measured is R_NS = 9.4 +/-1.2 km. On the basis of spectral analysis alone, this measured value is not affected by imposing an assumption of causality in the core. However, the assumptions underlying this R_NS measurement would be falsified by the observation of any neutron star with a mass >2.6 Msun, since radii 99% certainty. 10 pages, 3 figures, 2 tables. Accepted in ApJL. New figures added! |
| Databáze: | OpenAIRE |
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