dc.contributor.author | Vurgun, Eda | |
dc.contributor.author | Linares, Manuel | |
dc.contributor.author | Ransom, Scott | |
dc.contributor.author | Papitto, Alessandro | |
dc.contributor.author | Bogdanov, Slavko | |
dc.contributor.author | Bozzo, Enrico | |
dc.contributor.author | Rea, Nanda | |
dc.contributor.author | García-Senz, Domingo | |
dc.contributor.author | Freire, Paulo | |
dc.contributor.author | Stairs, Ingrid | |
dc.date.accessioned | 2023-02-13T10:03:00Z | |
dc.date.available | 2023-02-13T10:03:00Z | |
dc.date.created | 2023-01-06T14:24:07Z | |
dc.date.issued | 2022 | |
dc.identifier.citation | The Astrophysical Journal (ApJ). 2022, 941 (1), . | en_US |
dc.identifier.issn | 0004-637X | |
dc.identifier.uri | https://hdl.handle.net/11250/3050301 | |
dc.description.abstract | We present the results of a deep study of the neutron star (NS) population in the globular cluster M28 (NGC 6626), using the full 330 ks 2002–2015 ACIS data set from the Chandra X-ray Observatory and coordinated radio observations taken with the Green Bank Telescope (GBT) in 2015. We investigate the X-ray luminosity (LX), spectrum, and orbital modulation of the seven known compact binary millisecond pulsars in the cluster. We report two simultaneous detections of the redback PSR J1824−2452I (M28I) and its X-ray counterpart at LX = [8.3 ± 0.9] × 1031 erg s−1. We discover a double-peaked X-ray orbital flux modulation in M28I during its pulsar state, centered around pulsar inferior conjunction. We analyze the spectrum of the quiescent NS low-mass X-ray binary to constrain its mass and radius. Using both hydrogen and helium NS atmosphere models, we find an NS radius of R = 9.2–11.5 km and R = 13.0–17.5 km, respectively, for an NS mass of 1.4 M⊙ (68% confidence ranges). We also search for long-term variability in the 46 brightest X-ray sources and report the discovery of six new variable low-luminosity X-ray sources in M28. | en_US |
dc.language.iso | eng | en_US |
dc.publisher | IOP Publishing | en_US |
dc.rights | Navngivelse 4.0 Internasjonal | * |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/deed.no | * |
dc.title | The Neutron Star Population in M28: A Joint Chandra/GBT Look at Pulsar Paradise | en_US |
dc.title.alternative | The Neutron Star Population in M28: A Joint Chandra/GBT Look at Pulsar Paradise | en_US |
dc.type | Peer reviewed | en_US |
dc.type | Journal article | en_US |
dc.description.version | publishedVersion | en_US |
dc.source.pagenumber | 0 | en_US |
dc.source.volume | 941 | en_US |
dc.source.journal | The Astrophysical Journal (ApJ) | en_US |
dc.source.issue | 1 | en_US |
dc.identifier.doi | 10.3847/1538-4357/ac9ea0 | |
dc.identifier.cristin | 2102206 | |
cristin.ispublished | true | |
cristin.fulltext | original | |
cristin.qualitycode | 2 | |