Comparing recent PTA results on the nanohertz stochastic gravitational wave background
Abstract
The Australian, Chinese, European, Indian, and North American pulsar timing array (PTA) collaborations recently reported, at varying levels, evidence for the presence of a nanohertz gravitational wave background (GWB). Given that each PTA made different choices in modeling their data, we perform a comparison of the GWB and individual pulsar noise parameters across the results reported from the PTAs that constitute the International Pulsar Timing Array (IPTA). We show that despite making different modeling choices, there is no significant difference in the GWB parameters that are measured by the different PTAs, agreeing within . The pulsar noise parameters are also consistent between different PTAs for the majority of the pulsars included in these analyses. We bridge the differences in modeling choices by adopting a standardized noise model for all pulsars and PTAs, finding that under this model there is a reduction in the tension in the pulsar noise parameters. As part of this reanalysis, we "extended" each PTA's data set by adding extra pulsars that were not timed by that PTA. Under these extensions, we find better constraints on the GWB amplitude and a higher signal-to-noise ratio for the Hellings and Downs correlations. These extensions serve as a prelude to the benefits offered by a full combination of data across all pulsars in the IPTA, i.e., the IPTA's Data Release 3, which will involve not just adding in additional pulsars, but also including data from all three PTAs where any given pulsar is timed by more than as single PTA.
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Cite
@article{arxiv.2309.00693,
title = {Comparing recent PTA results on the nanohertz stochastic gravitational wave background},
author = {The International Pulsar Timing Array Collaboration and G. Agazie and J. Antoniadis and A. Anumarlapudi and A. M. Archibald and P. Arumugam and S. Arumugam and Z. Arzoumanian and J. Askew and S. Babak and M. Bagchi and M. Bailes and A. -S. Bak Nielsen and P. T. Baker and C. G. Bassa and A. Bathula and B. Bécsy and A. Berthereau and N. D. R. Bhat and L. Blecha and M. Bonetti and E. Bortolas and A. Brazier and P. R. Brook and M. Burgay and S. Burke-Spolaor and R. Burnette and R. N. Caballero and A. Cameron and R. Case and A. Chalumeau and D. J. Champion and S. Chanlaridis and M. Charisi and S. Chatterjee and K. Chatziioannou and B. D. Cheeseboro and S. Chen and Z. -C. Chen and I. Cognard and T. Cohen and W. A. Coles and J. M. Cordes and N. J. Cornish and F. Crawford and H. T. Cromartie and K. Crowter and M. Curyło and C. J. Cutler and S. Dai and S. Dandapat and D. Deb and M. E. DeCesar and D. DeGan and P. B. Demorest and H. Deng and S. Desai and G. Desvignes and L. Dey and N. Dhanda-Batra and V. Di Marco and T. Dolch and B. Drachler and C. Dwivedi and J. A. Ellis and M. Falxa and Y. Feng and R. D. Ferdman and E. C. Ferrara and W. Fiore and E. Fonseca and A. Franchini and G. E. Freedman and J. R. Gair and N. Garver-Daniels and P. A. Gentile and K. A. Gersbach and J. Glaser and D. C. Good and B. Goncharov and A. Gopakumar and E. Graikou and J. -M. Grießmeier and L. Guillemot and K. Gültekin and Y. J. Guo and Y. Gupta and K. Grunthal and J. S. Hazboun and S. Hisano and G. B. Hobbs and S. Hourihane and H. Hu and F. Iraci and K. Islo and D. Izquierdo-Villalba and J. Jang and J. Jawor and G. H. Janssen and R. J. Jennings and A. Jessner and A. D. Johnson and M. L. Jones and B. C. Joshi and A. R. Kaiser and D. L. Kaplan and A. Kapur and F. Kareem and R. Karuppusamy and E. F. Keane and M. J. Keith and L. Z. Kelley and M. Kerr and J. S. Key and D. Kharbanda and T. Kikunaga and T. C. Klein and N. Kolhe and M. Kramer and M. A. Krishnakumar and A. Kulkarni and N. Laal and K. Lackeos and M. T. Lam and W. G. Lamb and B. B. Larsen and T. J. W. Lazio and K. J. Lee and Y. Levin and N. Lewandowska and T. B. Littenberg and K. Liu and T. Liu and Y. Liu and A. Lommen and D. R. Lorimer and M. E. Lower and J. Luo and R. Luo and R. S. Lynch and A. G. Lyne and C. -P. Ma and Y. Maan and D. R. Madison and R. A. Main and R. N. Manchester and R. Mandow and M. A. Mattson and A. McEwen and J. W. McKee and M. A. McLaughlin and N. McMann and B. W. Meyers and P. M. Meyers and M. B. Mickaliger and M. Miles and C. M. F. Mingarelli and A. Mitridate and P. Natarajan and R. S. Nathan and C. Ng and D. J. Nice and I. C. Niţu and K. Nobleson and S. K. Ocker and K. D. Olum and S. Osłowski and A. K. Paladi and A. Parthasarathy and T. T. Pennucci and B. B. P. Perera and D. Perrodin and A. Petiteau and P. Petrov and N. S. Pol and N. K. Porayko and A. Possenti and T. Prabu and H. Quelquejay Leclere and H. A. Radovan and P. Rana and S. M. Ransom and P. S. Ray and D. J. Reardon and A. F. Rogers and J. D. Romano and C. J. Russell and A. Samajdar and S. A. Sanidas and S. C. Sardesai and A. Schmiedekamp and C. Schmiedekamp and K. Schmitz and L. Schult and A. Sesana and G. Shaifullah and R. M. Shannon and B. J. Shapiro-Albert and X. Siemens and J. Simon and J. Singha and M. S. Siwek and L. Speri and R. Spiewak and A. Srivastava and I. H. Stairs and B. W. Stappers and D. R. Stinebring and K. Stovall and J. P. Sun and M. Surnis and S. C. Susarla and A. Susobhanan and J. K. Swiggum and K. Takahashi and P. Tarafdar and J. Taylor and S. R. Taylor and G. Theureau and E. Thrane and N. Thyagarajan and C. Tiburzi and L. Toomey and J. E. Turner and C. Unal and M. Vallisneri and E. van der Wateren and R. van Haasteren and A. Vecchio and V. Venkatraman Krishnan and J. P. W. Verbiest and S. J. Vigeland and H. M. Wahl and S. Wang and Q. Wang and C. A. Witt and J. Wang and L. Wang and K. E. Wayt and Z. Wu and O. Young and L. Zhang and S. Zhang and X. -J. Zhu and A. Zic},
journal= {arXiv preprint arXiv:2309.00693},
year = {2023}
}
Comments
21 pages, 9 figures, submitted to ApJ