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- W4308167531 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 dataset 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 7 known compact binary millisecond pulsars (MSPs) in the cluster. We report two simultaneous detections of the redback PSR J1824-2452I (M28I) and its X-ray counterpart. 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 neutron star low-mass X-ray binary to constrain its mass and radius. Using both hydrogen and helium NS atmosphere models, we find a NS radius of R = 9.5-11.5 km and R = 13.5 - 16.7 km, respectively, for a neutron star mass of 1.4 Msun. 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." @default.
- W4308167531 created "2022-11-08" @default.
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- W4308167531 date "2022-11-02" @default.
- W4308167531 modified "2023-09-24" @default.
- W4308167531 title "The neutron star population in M28: a joint Chandra/GBT look at pulsar paradise" @default.
- W4308167531 doi "https://doi.org/10.48550/arxiv.2211.01067" @default.
- W4308167531 hasPublicationYear "2022" @default.
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