Low-frequency wideband timing of InPTA pulsars observed with the uGMRT

Nobleson, K and Agarwal, Nikita and Girgaonkar, Raghav and Desai, Shantanu and et al, . (2022) Low-frequency wideband timing of InPTA pulsars observed with the uGMRT. Monthly Notices of the Royal Astronomical Society, 512 (1). pp. 1234-1243. ISSN 0035-8711

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Abstract

High-precision measurements of the pulsar dispersion measure (DM) are possible using telescopes with low-frequency wideband receivers. We present an initial study of the application of the wideband timing technique, which can simultaneously measure the pulsar times of arrivals (ToAs) and DMs, for a set of five pulsars observed with the upgraded Giant Metrewave Radio Telescope (uGMRT) as part of the Indian Pulsar Timing Array (InPTA) campaign. We have used the observations with the 300-500 MHz band of the uGMRT for this purpose. We obtain high precision in DM measurements with precisions of the order 10-6 cm-3 pc. The ToAs obtained have sub-μs precision and the rms of the post-fit ToA residuals are in the sub-μs range. We find that the uncertainties in the DMs and ToAs obtained with this wideband technique, applied to low-frequency data, are consistent with the results obtained with traditional pulsar timing techniques and comparable to high-frequency results from other PTAs. This work opens up an interesting possibility of using low-frequency wideband observations for precision pulsar timing and gravitational wave detection with similar precision as high-frequency observations used conventionally. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.

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IITH Creators:

IITH Creators	ORCiD
Desai, Shantanu	http://orcid.org/0000-0002-0466-3288

Item Type:

Article

Additional Information:

GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research. BCJ, PR, AS, SD, LD, and YG acknowledge the support of the Department of Atomic Energy, Go v ernment of India, under project identification # RTI4002.

Uncontrolled Keywords:

pulsars: InPTA: gravitational waves

Subjects:

Electrical Engineering > Electrical and Electronic
Mathematics
Physics
Physics > Astronomy Astrophysics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

28 Jun 2022 06:35

Last Modified:

29 Jun 2022 10:15