2021/12/31 by K. Nobleson, K Nobleson, Nikita Agarwal +40
Engineering · Physics and Astronomy · #Acoustics #Advanced Frequency and Time Standards #Astronomy #Astrophysics #Computer science #Dispersion (optics) #GNSS positioning and interference #Galaxy #Giant Metrewave Radio Telescope #Low frequency #Measure (data warehouse) #Optics #Physics #Pulsar #Pulsars and Gravitational Waves Research #Range (aeronautics) #Wideband #astro-ph.HE #astro-ph.IM
paper · pdf · doi:10.1093/mnras/stac532
Accepted for publication in MNRAS
arxiv created 2022/02/23 · openalex publication_date 2022/02/25 · arxiv updated 2022/03/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 arrival (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 10-6cm-3pc. The ToAs obtained have sub-μs precision and the root-mean-square 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.