Academic Journal
A NICER View of the Nearest and Brightest Millisecond Pulsar: PSR J0437–4715
| Title: | A NICER View of the Nearest and Brightest Millisecond Pulsar: PSR J0437–4715 |
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| Authors: | Devarshi Choudhury, Tuomo Salmi, Serena Vinciguerra, Thomas E. Riley, Yves Kini, Anna L. Watts, Bas Dorsman, Slavko Bogdanov, Sebastien Guillot, Paul S. Ray, Daniel J. Reardon, Ronald A. Remillard, Anna V. Bilous, Daniela Huppenkothen, James M. Lattimer, Nathan Rutherford, Zaven Arzoumanian, Keith C. Gendreau, Sharon M. Morsink, Wynn C. G. Ho |
| Source: | The Astrophysical Journal Letters, Vol 971, Iss 1, p L20 (2024) |
| Publisher Information: | IOP Publishing, 2024. |
| Publication Year: | 2024 |
| Collection: | LCC:Astrophysics |
| Subject Terms: | Neutron stars, Pulsars, Rotation powered pulsars, Millisecond pulsars, Neutron star cores, Nuclear astrophysics, Astrophysics, QB460-466 |
| More Details: | We report Bayesian inference of the mass, radius, and hot X-ray emitting region properties—using data from the Neutron Star Interior Composition ExploreR (NICER)—for the brightest rotation-powered millisecond X-ray pulsar, PSR J0437−4715. Our modeling is conditional on informative tight priors on mass, distance, and binary inclination obtained from radio pulsar timing using the Parkes Pulsar Timing Array (PPTA; Reardon et al.), and we use NICER background models to constrain the nonsource background, cross-checking with data from XMM-Newton. We assume two distinct hot emitting regions and various parameterized hot region geometries that are defined in terms of overlapping circles; while simplified, these capture many of the possibilities suggested by detailed modeling of return current heating. For the preferred model identified by our analysis, we infer a mass of M = 1.418 ± 0.037 M _⊙ (largely informed by the PPTA mass prior) and an equatorial radius of $R={11.36}_{-0.63}^{+0.95}$ km, each reported as the posterior credible interval bounded by the 16% and 84% quantiles. This radius favors softer dense matter equations of state and is highly consistent with constraints derived from gravitational wave measurements of neutron star binary mergers. The hot regions are inferred to be nonantipodal and hence inconsistent with a pure centered dipole magnetic field. |
| Document Type: | article |
| File Description: | electronic resource |
| Language: | English |
| ISSN: | 2041-8213 2041-8205 |
| Relation: | https://doaj.org/toc/2041-8205 |
| DOI: | 10.3847/2041-8213/ad5a6f |
| Access URL: | https://doaj.org/article/2c6368f0ce8648789872a7dfccf78f83 |
| Accession Number: | edsdoj.2c6368f0ce8648789872a7dfccf78f83 |
| Database: | Directory of Open Access Journals |
| ISSN: | 20418213 20418205 |
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| DOI: | 10.3847/2041-8213/ad5a6f |
| Published in: | The Astrophysical Journal Letters |
| Language: | English |