PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
Neutron stars are not only of astrophysical interest, but are also of great interest to nuclear physicists because their attributes can be used to determine the properties of the dense matter in…
Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
- H. Cromartie, E. Fonseca, W. W. Zhu
- PhysicsNature Astronomy
- 1 January 2020
Despite its importance to our understanding of physics at supranuclear densities, the equation of state (EoS) of matter deep within neutron stars remains poorly understood. Millisecond pulsars (MSPs)…
A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
- T. E. Riley, A. Watts, T. Strohmayer
- PhysicsAstrophysical Journal
- 12 December 2019
We report on Bayesian parameter estimation of the mass and equatorial radius of the millisecond pulsar PSR J0030+0451, conditional on pulse-profile modeling of Neutron Star Interior Composition…
The NANOGrav 12.5 yr Data Set: Search for an Isotropic Stochastic Gravitational-wave Background
- Z. Arzoumanian, P. Baker, C. A. Witt
- PhysicsAstrophysical Journal Letters
- 9 September 2020
We search for an isotropic stochastic gravitational-wave background (GWB) in the 12.5 yr pulsar-timing data set collected by the North American Nanohertz Observatory for Gravitational Waves. Our…
The Radius of PSR J0740+6620 from NICER and XMM-Newton Data
PSR J0740+6620 has a gravitational mass of 2.08 ± 0.07 M ⊙, which is the highest reliably determined mass of any neutron star. As a result, a measurement of its radius will provide unique insight…
The Velocity Distribution of Isolated Radio Pulsars
- Z. Arzoumanian, D. Chernoff, J. Cordes
- Physics
- 8 June 2001
We infer the velocity distribution of radio pulsars based on large-scale 0.4 GHz pulsar surveys. We do so by modeling the evolution of the locations, velocities, spins, and radio luminosities of…
THE NANOGRAV NINE-YEAR DATA SET: MASS AND GEOMETRIC MEASUREMENTS OF BINARY MILLISECOND PULSARS
- E. Fonseca, T. Pennucci, Weiwei Zhu
- Physics
- 2 March 2016
We analyze 24 binary radio pulsars in the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) nine-year data set. We make 14 significant measurements of the Shapiro delay,…
Refined Mass and Geometric Measurements of the High-mass PSR J0740+6620
- E. Fonseca, H. Cromartie, W. Zhu
- PhysicsAstrophysical Journal Letters
- 2 April 2021
We report results from continued timing observations of PSR J0740+6620, a high-mass, 2.8 ms radio pulsar in orbit with a likely ultracool white dwarf companion. Our data set consists of combined…
A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
- T. E. Riley, A. Watts, I. Cognard
- PhysicsAstrophysical Journal Letters
- 14 May 2021
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…
An astronomical pattern-matching algorithm for computer-aided identification of whale sharks Rhincodon typus
- Z. Arzoumanian, J. Holmberg, B. Norman
- Environmental Science
- 1 December 2005
A novel technique for identifying individual whale sharks Rhincodon typus through numerical pattern matching of their natural surface 'spot' colourations is described, which is robust in that the incidence of false positives is low and failure to match images of the same shark is predominantly attributable to foreshortening in photographs obtained at oblique angles of more than 30°.
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