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Noise analysis of the Indian Pulsar Timing Array data release i

Srivastava, A and Desai, S and Kolhe, N and Surnis, M and Joshi, BC and Susobhanan, A and Chalumeau, A and Hisano, S and Nobleson, K and Arumugam, S and Kharbanda, D and Singha, J and Tarafdar, P and Arumugam, P and Bagchi, M and Bathula, A and Dandapat, S and Dey, L and Dwivedi, C and Girgaonkar, R and Gopakumar, A and Gupta, Y and Kikunaga, T and Krishnakumar, MA and Liu, K and Maan, Y and Manoharan, PK and Paladi, AK and Rana, P and Shaifullah, GM and Takahashi, K (2023) Noise analysis of the Indian Pulsar Timing Array data release i. In: Physical Review D, 108 (2).

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Official URL: https://doi.org/10.1103/PhysRevD.108.023008


The Indian Pulsar Timing Array (InPTA) collaboration has recently made its first official data release (DR1) for a sample of 14 pulsars using 3.5 years of uGMRT observations. We present the results of single-pulsar noise analysis for each of these 14 pulsars using the InPTA DR1. For this purpose, we consider white noise, achromatic red noise, dispersion measure (DM) variations, and scattering variations in our analysis. We apply Bayesian model selection to obtain the preferred noise models among these for each pulsar. For PSR J1600-3053, we find no evidence of DM and scattering variations, while for PSR J1909-3744, we find no significant scattering variations. Properties vary dramatically among pulsars. For example, we find a strong chromatic noise with chromatic index ∼2.9 for PSR J1939+2134, indicating the possibility of a scattering index that does not agree with that expected for a Kolmogorov scattering medium consistent with similar results for millisecond pulsars in past studies. Despite the relatively short time baseline, the noise models broadly agree with the other PTAs and provide, at the same time, well-constrained DM and scattering variations.

Item Type: Journal Article
Publication: Physical Review D
Publisher: American Physical Society
Additional Information: The copyright for this article belongs to the American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Joint Astronomy Programme
Date Deposited: 01 Aug 2023 05:11
Last Modified: 01 Aug 2023 05:11
URI: https://eprints.iisc.ac.in/id/eprint/82725

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