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Lookup NU author(s): Dr Anne ArchibaldORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2024. The Author(s). Published by the American Astronomical Society. 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’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’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(s): Agazie G, Antoniadis J, Anumarlapudi A, Archibald AM, Arumugam P, Arumugam S, Arzoumanian Z, Askew J, Babak S, Bagchi M, Bailes M, Nielsen AB, Baker PT, Bassa CG, Bathula A, Becsy B, Berthereau A, Bhat NDR, Blecha L, Bonetti M, Bortolas E, Brazier A, Brook PR, Burgay M, Burke-Spolaor S, Burnette R, Caballero RN, Cameron A, Case R, Chalumeau A, Champion DJ, Chanlaridis S, Charisi M, Chatterjee S, Chatziioannou K, Cheeseboro BD, Chen S, Chen Z-C, Cognard I, Cohen T, Coles WA, Cordes JM, Cornish NJ, Crawford F, Cromartie HT, Crowter K, Curylo M, Cutler CJ, Dai S, Dandapat S, Deb D, DeCesar ME, DeGan D, Demorest PB, Deng H, Desai S, Desvignes G, Dey L, Dhanda-Batra N, Di Marco V, Dolch T, Drachler B, Dwivedi C, Ellis JA, Falxa M, Feng Y, Ferdman RD, Ferrara EC, Fiore W, Fonseca E, Franchini A, Freedman GE, Gair JR, Garver-Daniels N, Gentile PA, Gersbach KA, Glaser J, Good DC, Goncharov B, Gopakumar A, Graikou E, Griessmeier J-M, Guillemot L, Gultekin K, Guo YJ, Gupta Y, Grunthal K, Hazboun JS, Hisano S, Hobbs GB, Hourihane S, Hu H, Iraci F, Islo K, Izquierdo-Villalba D, Jang J, Jawor J, Janssen GH, Jennings RJ, Jessner A, Johnson AD, Jones ML, Joshi BC, Kaiser AR, Kaplan DL, Kapur A, Kareem F, Karuppusamy R, Keane EF, Keith MJ, Kelley LZ, Kerr M, Key JS, Kharbanda D, Kikunaga T, Klein TC, Kolhe N, Kramer M, Krishnakumar MA, Kulkarni A, Laal N, Lackeos K, Lam MT, Lamb WG, Larsen BB, Lazio TJW, Lee KJ, Levin Y, Lewandowska N, Littenberg TB, Liu K, Liu T, Liu Y, Lommen A, Lorimer DR, Lower ME, Luo J, Luo R, Lynch RS, Lyne AG, Ma C-P, Maan Y, Madison DR, Main RA, Manchester RN, Mandow R, Mattson MA, McEwen A, McKee JW, McLaughlin MA, McMann N, Meyers BW, Meyers PM, Mickaliger MB, Miles M, Mingarelli CMF, Mitridate A, Natarajan P, Nathan RS, Ng C, Nice DJ, Nitu IC, Nobleson K, Ocker SK, Olum KD, Oslowski S, Paladi AK, Parthasarathy A, Pennucci TT, Perera BBP, Perrodin D, Petiteau A, Petrov P, Pol NS, Porayko NK, Possenti A, Prabu T, Leclere HQ, Radovan HA, Rana P, Ransom SM, Ray PS, Reardon DJ, Rogers AF, Romano JD, Russell CJ, Samajdar A, Sanidas SA, Sardesai SC, Schmiedekamp A, Schmiedekamp C, Schmitz K, Schult L, Sesana A, Shaifullah G, Shannon RM, Shapiro-Albert BJ, Siemens X, Simon J, Singha J, Siwek MS, Speri L, Spiewak R, Srivastava A, Stairs IH, Stappers BW, Stinebring DR, Stovall K, Sun JP, Surnis M, Susarla SC, Susobhanan A, Swiggum JK, Takahashi K, Tarafdar P, Taylor J, Taylor SR, Theureau G, Thrane E, Thyagarajan N, Tiburzi C, Toomey L, Turner JE, Unal C, Vallisneri M, van der Wateren E, van Haasteren R, Vecchio A, Venkatraman Krishnan V, Verbiest JPW, Vigeland SJ, Wahl HM, Wang S, Wang Q, Witt CA, Wang J, Wang L, Wayt KE, Wu Z, Young O, Zhang L, Zhang S, Zhu X-J, Zic A
Publication type: Article
Publication status: Published
Journal: Astrophysical Journal
Year: 2024
Volume: 966
Issue: 1
Print publication date: 01/05/2024
Online publication date: 29/04/2024
Acceptance date: 20/03/2024
Date deposited: 15/05/2024
ISSN (print): 0004-637X
ISSN (electronic): 1538-4357
Publisher: Institute of Physics
URL: https://doi.org/10.3847/1538-4357/ad36be
DOI: 10.3847/1538-4357/ad36be
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