Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 918, Issue 2, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ac0a81
Keywords
-
Categories
Funding
- NASA through the NICER mission
- Astrophysics Explorers Program
- ERC [865768]
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) through the VIDI and Projectruimte grants
- NWO
- SURF Cooperative
- CALMIP supercomputing center [2016- P19056]
- NASA [NNX17AC28G, 80NSSC20K0275, 80NSSC20K0278, NAS5-26555]
- NSERC
- NASA through Hubble Fellowship Program [HST-HF2-51440.001]
- Space Telescope Science Institute [HST-HF2-51453.001]
- National Science Foundation [1430284]
- NSF Physics Frontiers Center [1430284]
- Canadian Institute for Advanced Research
- NASA [NNX17AC28G, 1003313] Funding Source: Federal RePORTER
- European Research Council (ERC) [865768] Funding Source: European Research Council (ERC)
Ask authors/readers for more resources
The study utilizes Bayesian estimation to analyze the radius, mass, and hot surface regions of the massive millisecond pulsar PSR J0740+6620 based on Neutron Star Interior Composition Explorer X-ray Timing Instrument event data. The results show that the equatorial radius of PSR J0740+6620 is approximately 12.39 km, with a mass of about 2.072 solar masses, each reported within a specific posterior credible interval.
We report on Bayesian estimation of the radius, mass, and hot surface regions of the massive millisecond pulsar PSR J0740+6620, conditional on pulse-profile modeling of Neutron Star Interior Composition Explorer X-ray Timing Instrument event data. We condition on informative pulsar mass, distance, and orbital inclination priors derived from the joint North American Nanohertz Observatory for Gravitational Waves and Canadian Hydrogen Intensity Mapping Experiment/Pulsar wideband radio timing measurements of Fonseca et al. We use XMM-Newton European Photon Imaging Camera spectroscopic event data to inform our X-ray likelihood function. The prior support of the pulsar radius is truncated at 16 km to ensure coverage of current dense matter models. We assume conservative priors on instrument calibration uncertainty. We constrain the equatorial radius and mass of PSR J0740+6620 to be 12.39(-0.98)(+1.30) km and 2.072(-0.066)(+0.067) M-circle dot respectively, each reported as the posterior credible interval bounded by the 16% and 84% quantiles, conditional on surface hot regions that are non-overlapping spherical caps of fully ionized hydrogen atmosphere with uniform effective temperature; a posteriori, the temperature is log(10)(T[K]) = 5.99(-0.06)(+0.05) for each hot region. All software for the X-ray modeling framework is open-source and all data, model, and sample information is publicly available, including analysis notebooks and model modules in the Python language. Our marginal likelihood function of mass and equatorial radius is proportional to the marginal joint posterior density of those parameters (within the prior support) and can thus be computed from the posterior samples.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available