Search Results - "Sardesai, Shashwat C"
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Characterizing the Nanohertz Gravitational Wave Background Using a t-process Power Spectral Density
Published in The Astrophysical journal (01-12-2024)“…Pulsar timing arrays (PTAs) are sensitive to low-frequency gravitational waves (GWs), which induce correlated changes in millisecond pulsars’ timing residuals…”
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The NANOGrav 15 yr Data Set: Evidence for a Gravitational-wave Background
Published in Astrophysical journal. Letters (01-07-2023)“…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 the North…”
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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)“…The NANOGrav 15 yr data set shows evidence for the presence of a low-frequency gravitational-wave background (GWB). While many physical processes can source…”
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The NANOGrav 15 yr Data Set: Search for Signals from New Physics
Published in Astrophysical journal. Letters (01-07-2023)“…The 15 yr pulsar timing data set collected by the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) shows positive evidence for the…”
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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)“…We present observations and timing analyses of 68 millisecond pulsars (MSPs) comprising the 15 yr data set of the North American Nanohertz Observatory for…”
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The NANOGrav 15 yr Data Set: Detector Characterization and Noise Budget
Published in Astrophysical journal. Letters (01-07-2023)“…Pulsar timing arrays (PTAs) are galactic-scale gravitational wave (GW) detectors. Each individual arm, composed of a millisecond pulsar, a radio telescope, and…”
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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)“…Evidence for a low-frequency stochastic gravitational-wave background has recently been reported based on analyses of pulsar timing array data. The most likely…”
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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)“…The North American Nanohertz Observatory for Gravitational Waves (NANOGrav) has reported evidence for the presence of an isotropic nanohertz gravitational-wave…”
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The NANOGrav 12.5 yr Data Set: Search for Gravitational Wave Memory
Published in The Astrophysical journal (01-03-2024)“…We present the results of a Bayesian search for gravitational wave (GW) memory in the NANOGrav 12.5 yr data set. We find no convincing evidence for any…”
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The NANOGrav 15 yr Data Set: Search for Transverse Polarization Modes in the Gravitational-wave Background
Published in Astrophysical journal. Letters (01-03-2024)“…Recently we found compelling evidence for a gravitational-wave background with Hellings and Downs (HD) correlations in our 15 yr data set. These correlations…”
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The NANOGrav 12.5 yr Data Set: A Computationally Efficient Eccentric Binary Search Pipeline and Constraints on an Eccentric Supermassive Binary Candidate in 3C 66B
Published in The Astrophysical journal (01-03-2024)“…The radio galaxy 3C 66B has been hypothesized to host a supermassive black hole binary (SMBHB) at its center based on electromagnetic observations. Its…”
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How to Detect an Astrophysical Nanohertz Gravitational Wave Background
Published in The Astrophysical journal (01-12-2023)“…Analyses of pulsar timing data have provided evidence for a stochastic gravitational wave background in the nanohertz frequency band. The most plausible source…”
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Erratum: “The NANOGrav 15 yr Data Set: Search for Signals from New Physics” (2023, ApJL 951 L11)
Published in Astrophysical journal. Letters (01-08-2024)Get full text
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Characterizing the nanohertz gravitational wave background using a $t$-process power spectral density
Published 19-08-2024“…Pulsar timing arrays are sensitive to low-frequency gravitational waves (GWs), which induce correlated changes in millisecond pulsars' timing residuals. PTA…”
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15
Generalized optimal statistic for characterizing multiple correlated signals in pulsar timing arrays
Published 16-03-2023“…Phys. Rev. D 108 (2023) 124081 The optimal statistic (OS) is a frequentist estimator for the amplitude and significance of a spatially-correlated signal in…”
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The NANOGrav 15 yr Data Set: Harmonic Analysis of the Pulsar Angular Correlations
Published 20-11-2024“…Pulsar timing array observations have found evidence for an isotropic gravitational wave background with the Hellings-Downs angular correlations, expected from…”
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Galaxy Tomography with the Gravitational Wave Background from Supermassive Black Hole Binaries
Published 08-11-2024“…The detection of a stochastic gravitational wave background by pulsar timing arrays suggests the presence of a supermassive black hole binary population…”
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The NANOGrav 12.5-year Data Set: Search for Gravitational Wave Memory
Published 25-07-2023“…We present the results of a Bayesian search for gravitational wave (GW) memory in the NANOGrav 12.5-yr data set. We find no convincing evidence for any…”
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The NANOGrav 12.5-year data set: Search for Non-Einsteinian Polarization Modes in theGravitational-Wave Background
Published 29-09-2021“…The Astrophysical Journal Letters, vol. 923, no. 2, p. L22, Dec. 2021 We search NANOGrav's 12.5-year data set for evidence of a gravitational wave background…”
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