Title:	Low-frequency wideband timing of InPTA pulsars observed with the uGMRT
Authors:	Nobleson, K. Agarwal, Nikita Girgaonkar, Raghav Pandian, Arul Chandra Joshi, Bhal Krishnakumar, M.A. Susobhanan, Abhimanyu Desai, Shantanu Prabu, T. Bathula, Adarsh Pennucci, Timothy T. Banik, Sarmistha Bagchi, Manjari Dhanda Batra, Neelam Choudhary, Arpita Dandapat, Subhajit Dey, Lankeswar Gupta, Yashwant Hisano, Shinnosuke Kato, Ryo Kharbanda, Divyansh Kikunaga, Tomonosuke Kolhe, Neel Maan, Yogesh Marmat, Piyush Arumugam, P. Manoharan, P.K. Pathak, Dhruv Singha, Jaikhomba Surnis, Mayuresh P. Susarla, Sai Chaitanya Takahashi, Keitaro
Keywords:	pulsars gravitational waves
Issue Date:	May-2022
Publisher:	Oxford University Press on behalf of the Royal Astronomical Society
Citation:	Monthly Notices of Royal Astronomical Society, 2022, Vol. 512, p1234
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.
Description:	Restricted Access
URI:	http://hdl.handle.net/2289/7913
ISSN:	0035-8711 1365-2966 (Online)
Alternative Location:	https://arxiv.org/abs/2112.06908 https://ui.adsabs.harvard.edu/abs/2022MNRAS.512.1234N/abstract https://inspirehep.net/literature/1989650 https://doi.org/10.1093/mnras/stac532
Copyright:	2022 The Author(s)
Appears in Collections:	Research Papers(EEG)

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