| Name: | Aman Srivastava |
| Affiliation: | Department of Physics, Indian Institute of Technology Hyderabad |
| Conference ID : | ASI2024_128 |
| Title : | Noise analysis of the Indian Pulsar Timing Array data release I |
| Authors : | Aman Srivastava1, Aurélien Chalumeau2, Kuo Liu3, Golam M. Shaifullah2,4,5, InPTA Collaboration6 |
| Authors Affiliation: | 1 Department of Physics, IIT Hyderabad, Kandi, Telangana 502284, India
2 Dipartimento di Fisica “G. Occhialini”, Universitá degli Studi di Milano-Bicocca, Piazza della
Scienza 3, 20126 Milano, Italy
3 Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
4 INFN, Sezione di Milano-Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
5 INAF, Osservatorio Astronomico di Cagliari, Via della Scienza 5, 09047 Selargius, Italy
6 Indian Pulsar Timing Array collaboration, India |
| Mode of Presentation: | Oral |
| Abstract Category : | High Energy Phenomena, Fundamental Physics and Astronomy |
| Abstract : | 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 J 1600 − 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 PSRJ 1939+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.
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