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Wide-band timing of GMRT discovered millisecond pulsars
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Wide-band timing of GMRT discovered millisecond pulsars
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Wide-band timing of GMRT discovered millisecond pulsars
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Paper
Wide-band timing of GMRT discovered millisecond pulsars
2022
Overview
Modeling of frequency-dependent effects, contributed by the turbulence in the free electron density of interstellar plasma, is required to enable the detection of the expected imprints from the stochastic gravitational-wave (GW) background in pulsar timing data. In this work, we present an investigation of temporal variations of interstellar medium for a set of millisecond pulsars (MSPs) with the upgraded GMRT aided by large fractional bandwidth at lower observing frequencies. Contrary to the conventional narrow-band analysis using a frequency invariant template profile, we applied \\(PulsePortraiture\\) based wide-band timing analysis while correcting for the evolution of the pulsar profile with frequency. Implementation of \\(PulsePortraiture\\) based wide-band timing method for the GMRT discovered MSPs to probe the DM variations resulted in a DM precision of \\(10^-4\\,pc~cm^-3\\). In general, we achieve similar DM and timing precision from wide-band timing compared to the narrow-band timing with matching temporal variations of DMs. This wide-band timing study of newly discovered MSPs over a wide frequency range highlights the effectiveness of profile-modeling at low frequencies and probes the potential of using them in pulsar timing array.
Publisher
Cornell University Library, arXiv.org
