The Indian Pulsar Timing Array: First data release

Tarafdar, P and Nobleson, K and Desai, Shantanu and et al, . (2022) The Indian Pulsar Timing Array: First data release. Publications of the Astronomical Society of Australia, 39. ISSN 1323-3580

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Abstract

We present the pulse arrival times and high-precision dispersion measure estimates for 14 millisecond pulsars observed simultaneously in the 300-500 MHz and 1260-1460 MHz frequency bands using the upgraded Giant Metrewave Radio Telescope. The data spans over a baseline of 3.5 years (2018-2021), and is the first official data release made available by the Indian Pulsar Timing Array collaboration. This data release presents a unique opportunity for investigating the interstellar medium effects at low radio frequencies and their impact on the timing precision of pulsar timing array experiments. In addition to the dispersion measure time series and pulse arrival times obtained using both narrowband and wideband timing techniques, we also present the dispersion measure structure function analysis for selected pulsars. Our ongoing investigations regarding the frequency dependence of dispersion measures have been discussed. Based on the preliminary analysis for five millisecond pulsars, we do not find any conclusive evidence of chromaticity in dispersion measures. Data from regular simultaneous two-frequency observations are presented for the first time in this work. This distinctive feature leads us to the highest precision dispersion measure estimates obtained so far for a subset of our sample. Simultaneous multi-band upgraded Giant Metrewave Radio Telescope observations in 300-500 MHz and 1260-1460 MHz are crucial for high-precision dispersion measure estimation and for the prospect of expanding the overall frequency coverage upon the combination of data from the various Pulsar Timing Array consortia in the near future. Parts of the data presented in this work are expected to be incorporated into the upcoming third data release of the International Pulsar Timing Array.

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IITH Creators:

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

Item Type:

Article

Additional Information:

InPTA acknowledges the support of the GMRT staff in resolving technical difficulties and providing technical solutions for highprecision work. We acknowledge the GMRT telescope operators for the observations. The GMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research, India. We acknowledge the use of IPTA DR2 (Perera et al. 2019) for this paper. AS, BCJ, YG, YM, AG, LD, SuD, and PR acknowledge the support of the Department of Atomic Energy, Government of India, under Project Identification #RTI 4002. BCJ acknowledges the support of the Department of Atomic Energy, Government of India, under project No. 12-R&D-TFR-5.02-0700. AS is supported by the NANOGrav NSF Physics Frontiers Center (awards #1430284 and 2020265). SH is supported by JSPS KAKENHI Grant Number 20J20509. AmS is supported by CSIR fellowship Grant number 09/1001(12656)/2021-EMR-I and DST-ICPS (T641). KT is partially supported by JSPS KAKENHI Grant Numbers 20H00180, 21H01130 and 21H04467 and the ISM Cooperative Research Program (2021-ISMCRP-2017). YG acknowledges the support of the Department of Atomic Energy, Government of India, under project No. 12-R&D-TFR-5.02-0700. MPS acknowledges funding from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme (grant agreement No. 694745). We are grateful to the anonymous referee for a thorough and comprehensive review of our manuscript.

Uncontrolled Keywords:

radio telescopes radio astronomy astronomy data analysis pulsar timing method millisecond pulsars

Subjects:

Physics

Divisions:

Department of Physics

Depositing User:

. LibTrainee 2021

Date Deposited:

04 Nov 2022 07:10

Last Modified:

04 Nov 2022 07:10