@article{fe3588ee63e44285b73847f923d59992,
title = "Comparing Recent Pulsar Timing Array 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 1σ. 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{\textquoteright}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-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{\textquoteright}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 a single PTA.",
author = "\{The International Pulsar Timing Array Collaboration\} and G. Agazie and J. Antoniadis and A. Anumarlapudi and Archibald, \{A. M.\} and P. Arumugam and S. Arumugam and Z. Arzoumanian and J. Askew and S. Babak and M. Bagchi and M. Bailes and Nielsen, \{A. S.Bak\} and Baker, \{P. T.\} and Bassa, \{C. G.\} and A. Bathula and B. B{\'e}csy and A. Berthereau and Bhat, \{N. D.R.\} and L. Blecha and M. Bonetti and E. Bortolas and A. Brazier and Brook, \{P. R.\} and M. Burgay and S. Burke-Spolaor and R. Burnette and Caballero, \{R. N.\} and A. Cameron and R. Case and A. Chalumeau and Champion, \{D. J.\} and S. Chanlaridis and M. Charisi and S. Chatterjee and K. Chatziioannou and Cheeseboro, \{B. D.\} and S. Chen and Chen, \{Z. C.\} and I. Cognard and T. Cohen and Coles, \{W. A.\} and Cordes, \{J. M.\} and Cornish, \{N. J.\} and F. Crawford and Cromartie, \{H. T.\} and K. Crowter and M. Cury{\l}o and Cutler, \{C. J.\} and S. Dai and S. Dandapat and D. Deb and DeCesar, \{M. E.\} and D. DeGan and Demorest, \{P. B.\} and H. Deng and S. Desai and G. Desvignes and L. Dey and N. Dhanda-Batra and \{Di Marco\}, V. and T. Dolch and B. Drachler and C. Dwivedi and Ellis, \{J. A.\} and M. Falxa and Y. Feng and Ferdman, \{R. D.\} and Ferrara, \{E. C.\} and W. Fiore and E. Fonseca and A. Franchini and Freedman, \{G. E.\} and Gair, \{J. R.\} and N. Garver-Daniels and Gentile, \{P. A.\} and Gersbach, \{K. A.\} and J. Glaser and Good, \{D. C.\} and B. Goncharov and A. Gopakumar and E. Graikou and Griessmeier, \{J. M.\} and L. Guillemot and K. G{\"u}ltekin and Guo, \{Y. J.\} and Y. Gupta and K. Grunthal and Hazboun, \{J. S.\} and S. Hisano and Hobbs, \{G. B.\} and S. Hourihane and H. Hu and F. Iraci and K. Islo and D. Izquierdo-Villalba and J. Jang and J. Jawor and Janssen, \{G. H.\} and Jennings, \{R. J.\} and Keane, \{E. F.\}",
note = "Publisher Copyright: {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society.",
year = "2024",
month = may,
day = "1",
doi = "10.3847/1538-4357/ad36be",
language = "English",
volume = "966",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "American Astronomical Society",
number = "1",
}