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The NANOGrav Nine-Year Data Set: Measurement and Interpretation of Variations in Dispersion Measures
M. L. Jones, M. A. McLaughlin, M. T. Lam +21
We analyze dispersion measure (DM) variations of 37 millisecond pulsars in the 9-year NANOGrav data release and constrain the sources of these variations. Variations are significan…
The NANOGrav Nine-Year Data Set: Excess Noise in Millisecond Pulsar Arrival Times
M. T. Lam, J. M. Cordes, S. Chatterjee +22
Gravitational wave astronomy using a pulsar timing array requires high-quality millisecond pulsars, correctable interstellar propagation delays, and high-precision measurements of…
Swift J174540.7-290015: a new accreting binary in the Galactic Center
G. Ponti, C. Jin, B. De Marco +8
We report on the identification of the new Galactic Center (GC) transient Swift J174540.7-290015 as a likely low mass X-ray binary (LMXB) located at only 16 arcsec from Sgr A*. Thi…
PSR J1024-0719: A Millisecond Pulsar in an Unusual Long-Period Orbit
D. L. Kaplan, T. Kupfer, D. J. Nice +32
PSR J10240719 is a millisecond pulsar that was long thought to be isolated. However, puzzling results concerning its velocity, distance, and low rotational period derivative hav…
The NANOGrav Nine-year Data Set: Mass and Geometric Measurements of Binary Millisecond Pulsars
Emmanuel Fonseca, Timothy T. Pennucci, Justin A. Ellis +17
We analyze 24 binary radio pulsars in the North American Nanohertz Observatory for Gravitational Waves (NANOGrav) nine-year data set. We make fourteen significant measurements of S…
The NANOGrav Nine-year Data Set: Monitoring Interstellar Scattering Delays
Lina Levin, Maura A. McLaughlin, Glenn Jones +22
We report on an effort to extract and monitor interstellar scintillation parameters in regular timing observations collected for the NANOGrav pulsar timing array. Scattering delays…