Search Results - "Cromartie, H. Thankful"
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PINT: Maximum-likelihood Estimation of Pulsar Timing Noise Parameters
Published in The Astrophysical journal (01-08-2024)“…PINT is a pure-Python framework for high-precision pulsar timing developed on top of widely used and well-tested Python libraries, supporting both interactive…”
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Discovery, Timing, and Multiwavelength Observations of the Black Widow Millisecond Pulsar PSR J1555–2908
Published in The Astrophysical journal (01-03-2022)“…We report the discovery of PSR J1555−2908, a 1.79 ms radio and gamma-ray pulsar in a 5.6 hr binary system with a minimum companion mass of 0.052 M⊙. This fast…”
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Bayesian Solar Wind Modeling with Pulsar Timing Arrays
Published in The Astrophysical journal (01-04-2022)“…Abstract Using Bayesian analyses we study the solar electron density with the NANOGrav 11 yr pulsar timing array (PTA) data set. Our model of the solar wind is…”
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The NANOGrav 12.5-Year Data Set: Dispersion Measure Misestimations with Varying Bandwidths
Published in The Astrophysical journal (01-05-2024)“…Abstract Noise characterization for pulsar-timing applications accounts for interstellar dispersion by assuming a known frequency dependence of the delay it…”
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The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract We report multiple lines of evidence for a stochastic signal that is correlated among 67 pulsars from the 15 yr pulsar timing data set collected by…”
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The NANOGrav 15 yr Data Set: Constraints on Supermassive Black Hole Binaries from the Gravitational-wave Background
Published in Astrophysical journal. Letters (01-08-2023)“…Abstract The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can…”
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The NANOGrav 15 yr Data Set: Search for Signals from New Physics
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) shows positive evidence for…”
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The NANOGrav 15 yr Data Set: Observations and Timing of 68 Millisecond Pulsars
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract We present observations and timing analyses of 68 millisecond pulsars (MSPs) comprising the 15 yr data set of the North American Nanohertz Observatory…”
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The NANOGrav 11 Year Data Set: Pulsar-timing Constraints on the Stochastic Gravitational-wave Background
Published in The Astrophysical journal (20-05-2018)“…We search for an isotropic stochastic gravitational-wave background (GWB) in the newly released 11 year data set from the North American Nanohertz Observatory…”
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The NANOGrav 15 yr Data Set: Detector Characterization and Noise Budget
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract Pulsar timing arrays (PTAs) are galactic-scale gravitational wave (GW) detectors. Each individual arm, composed of a millisecond pulsar, a radio…”
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The NANOGrav 15 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract Evidence for a low-frequency stochastic gravitational-wave background has recently been reported based on analyses of pulsar timing array data. The…”
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A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
Published 22-09-2021“…The Astrophysical Journal Letters, Volume 918, Number 2, 2021 We report on Bayesian estimation of the radius, mass, and hot surface regions of the massive…”
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A NICER View of PSR J1231−1411: A Complex Case
Published in The Astrophysical journal (01-11-2024)“…Recent constraints on neutron star mass and radius have advanced our understanding of the equation of state (EOS) of cold dense matter. Some of them have been…”
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The NANOGrav 12.5-Year Data Set: Monitoring Interstellar Scattering Delays
Published 30-04-2021“…We extract interstellar scintillation parameters for pulsars observed by the NANOGrav radio pulsar timing program. Dynamic spectra for the observing epochs of…”
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The NANOGrav 15 yr Data Set: Search for Anisotropy in the Gravitational-wave Background
Published in Astrophysical journal. Letters (01-10-2023)“…Abstract The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has reported evidence for the presence of an isotropic nanohertz…”
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The NANOGrav 12.5 yr Data Set: Bayesian Limits on Gravitational Waves from Individual Supermassive Black Hole Binaries
Published in Astrophysical journal. Letters (01-07-2023)“…Abstract Pulsar timing array collaborations, such as the North American Nanohertz Observatory for Gravitational Waves (NANOGrav), are seeking to detect…”
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Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
Published 06-07-2021“…We report results from continued timing observations of PSR J0740+6620, a high-mass, 2.8-ms radio pulsar in orbit with a likely ultra-cool white dwarf…”
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The NANOGrav 11 yr Data Set: Limits on Supermassive Black Hole Binaries in Galaxies within 500 Mpc
Published in The Astrophysical journal (01-06-2021)“…Abstract Supermassive black hole binaries (SMBHBs) should form frequently in galactic nuclei as a result of galaxy mergers. At subparsec separations, binaries…”
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Astrophysics Milestones For Pulsar Timing Array Gravitational Wave Detection
Published 24-03-2021“…The NANOGrav Collaboration reported strong Bayesian evidence for a common-spectrum stochastic process in its 12.5-yr pulsar timing array dataset, with median…”
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Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
Published 13-09-2019“…Despite its importance to our understanding of physics at supranuclear densities, the equation of state (EoS) of matter deep within neutron stars remains…”
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