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The second datarelease from theEuropean PulsarTiming Array John AntoniadisP. ArumugamS. Arumugam2023 год

The second data release from the European Pulsar Timing Array
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Аннотация: We present the results of the search for an isotropic stochastic gravitational wave background (GWB) at nanohertz frequencies using the second data release of the European Pulsar Timing Array (EPTA) for 25 millisecond pulsars and a combination with the first data release of the Indian Pulsar Timing Array (InPTA). We analysed (i) the full 24.7-year EPTA data set, (ii) its 10.3-year subset based on modern observing systems, (iii) the combination of the full data set with the first data release of the InPTA for ten commonly timed millisecond pulsars, and (iv) the combination of the 10.3-year subset with the InPTA data. These combinations allowed us to probe the contributions of instrumental noise and interstellar propagation effects. With the full data set, we find marginal evidence for a GWB, with a Bayes factor of four and a false alarm probability of $4\%$. With the 10.3-year subset, we report evidence for a GWB, with a Bayes factor of $60$ and a false alarm probability of about $0.1\%$ ($\gtrsim 3σ$ significance). The addition of the InPTA data yields results that are broadly consistent with the EPTA-only data sets, with the benefit of better noise modelling. Analyses were performed with different data processing pipelines to test the consistency of the results from independent software packages. The inferred spectrum from the latest EPTA data from new generation observing systems is rather uncertain and in mild tension with the common signal measured in the full data set. However, if the spectral index is fixed at 13/3, the two data sets give a similar amplitude of ($2.5\pm0.7)\times10^{-15}$ at a reference frequency of $1\,{\rm yr}^{-1}$. By continuing our detection efforts as part of the International Pulsar Timing Array (IPTA), we expect to be able to improve the measurement of spatial correlations and better characterise this signal in the coming years.
Год издания: 2023
Авторы: John Antoniadis, P. Arumugam, S. Arumugam, S. Babak, Manjari Bagchi, A.-S. Bak Nielsen, C. Bassa, Adarsh Bathula, A. Berthereau, Matteo Bonetti, Elisa Bortolas, Paul R. Brook, M. Burgay, R. N. Caballero, A. Chalumeau, D. J. Champion, S. Chanlaridis, Siyuan Chen, I. Cognard, Subhajit Dandapat, Debabrata Deb, S. Desai, G. Desvignes, N. Dhanda-Batra, C. Dwivedi, M. Falxa, R. D. Ferdman, Alessia Franchini, J. R. Gair, B. Goncharov, A. Gopakumar, E. Graikou, J.‐M. Grießmeier, L. Guillemot, Yingying Guo, Yashwant Gupta, Shinnosuke Hisano, H. Hu, F. Iraci, David Izquierdo–Villalba, J. Jang, J. Jawor, G. H. Janssen, A. Jessner, B. C. Joshi, F. Kareem, R. Karuppusamy, E. F. Keane, M. J. Keith, D. Kharbanda, Tomonosuke Kikunaga, Neel Kolhe, M. Krämer, M. A. Krishnakumar, K. Lackeos, K. J. Lee, K. Liu, Y. Liu, A. G. Lyne, James W. McKee, Yogesh Maan, Robert Main, M. B. Mickaliger, I. C. Niţu, K. Nobleson, A. K. Paladi, A. Parthasarathy, B. B. P. Perera, D. Perrodin, Antoine Petiteau, N. K. Porayko, Andrea Possenti, T. Prabu, H. Quelquejay Leclere, Prerna Rana, A. Samajdar, S. A. Sanidas, Alberto Sesana, G. Shaifullah, Jaikhomba Singha, Lorenzo Speri, R. Spiewak, Aman Srivastava, B. W. Stappers, Mayuresh Surnis, S. C. Susarla, Abhimanyu Susobhanan, Keitaro Takahashi, Pratik Tarafdar, G. Theureau, C. Tiburzi, E. van der Wateren, A. Vecchio, V. Venkatraman Krishnan, J. P. W. Verbiest, J. Wang, L. Wang, Ziwei Wu
Издательство: EDP Sciences
Источник: Astronomy and Astrophysics
Ключевые слова: Pulsars and Gravitational Waves Research, Radio Astronomy Observations and Technology, Geophysics and Gravity Measurements
Другие ссылки: Astronomy and Astrophysics (HTML)
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