Comparing recent PTA results on the nanohertz stochastic gravitational wave 
background

The International Pulsar Timing Array Collaboration; Agazie, G.; Antoniadis, J.; Anumarlapudi, A.; Archibald, A. M.; Arumugam, P.; Arumugam, S.; Arzoumanian, Z.; Askew, J.; Babak, S.; Bagchi, M.; Bailes, M.; Nielsen, A. -S. Bak; Baker, P. T.; Bassa, C. G.; Bathula, A.; Bécsy, B.; Berthereau, A.; Bhat, N. D. R.; Blecha, L.; Bonetti, M.; Bortolas, E.; Brazier, A.; Brook, P. R.; Burgay, M.; Burke-Spolaor, S.; Burnette, R.; Caballero, R. N.; Cameron, A.; Case, R.; Chalumeau, A.; Champion, D. J.; Chanlaridis, S.; Charisi, M.; Chatterjee, S.; Chatziioannou, K.; Cheeseboro, B. D.; Chen, S.; Chen, Z. -C.; Cognard, I.; Cohen, T.; Coles, W. A.; Cordes, J. M.; Cornish, N. J.; Crawford, F.; Cromartie, H. T.; Crowter, K.; Curyło, M.; Cutler, C. J.; Dai, S.; Dandapat, S.; Deb, D.; DeCesar, M. E.; DeGan, D.; Demorest, P. B.; Deng, H.; Desai, S.; Desvignes, G.; Dey, L.; Dhanda-Batra, N.; Di Marco, V.; Dolch, T.; Drachler, B.; Dwivedi, C.; Ellis, J. A.; Falxa, M.; Feng, Y.; Ferdman, R. D.; Ferrara, E. C.; Fiore, W.; Fonseca, E.; Franchini, A.; Freedman, G. E.; Gair, J. R.; Garver-Daniels, N.; Gentile, P. A.; Gersbach, K. A.; Glaser, J.; Good, D. C.; Goncharov, B.; Gopakumar, A.; Graikou, E.; Grießmeier, J. -M.; Guillemot, L.; Gültekin, K.; Guo, Y. J.; Gupta, Y.; Grunthal, K.; Hazboun, J. S.; Hisano, S.; Hobbs, G. B.; Hourihane, S.; Hu, H.; Iraci, F.; Islo, K.; Izquierdo-Villalba, D.; Jang, J.; Jawor, J.; Janssen, G. H.; Jennings, R. J.; Jessner, A.; Johnson, A. D.; Jones, M. L.; Joshi, B. C.; Kaiser, A. R.; Kaplan, D. L.; Kapur, A.; Kareem, F.; Karuppusamy, R.; Keane, E. F.; Keith, M. J.; Kelley, L. Z.; Kerr, M.; Key, J. S.; Kharbanda, D.; Kikunaga, T.; Klein, T. C.; Kolhe, N.; Kramer, M.; Krishnakumar, M. A.; Kulkarni, A.; Laal, N.; Lackeos, K.; Lam, M. T.; Lamb, W. G.; Larsen, B. B.; Lazio, T. J. W.; Lee, K. J.; Levin, Y.; Lewandowska, N.; Littenberg, T. B.; Liu, K.; Liu, T.; Liu, Y.; Lommen, A.; Lorimer, D. R.; Lower, M. E.; Luo, J.; Luo, R.; Lynch, R. S.; Lyne, A. G.; Ma, C. -P.; Maan, Y.; Madison, D. R.; Main, R. A.; Manchester, R. N.; Mandow, R.; Mattson, M. A.; McEwen, A.; McKee, J. W.; McLaughlin, M. A.; McMann, N.; Meyers, B. W.; Meyers, P. M.; Mickaliger, M. B.; Miles, M.; Mingarelli, C. M. F.; Mitridate, A.; Natarajan, P.; Nathan, R. S.; Ng, C.; Nice, D. J.; Niţu, I. C.; Nobleson, K.; Ocker, S. K.; Olum, K. D.; Osłowski, S.; Paladi, A. K.; Parthasarathy, A.; Pennucci, T. T.; Perera, B. B. P.; Perrodin, D.; Petiteau, A.; Petrov, P.; Pol, N. S.; Porayko, N. K.; Possenti, A.; Prabu, T.; Leclere, H. Quelquejay; Radovan, H. A.; Rana, P.; Ransom, S. M.; Ray, P. S.; Reardon, D. J.; Rogers, A. F.; Romano, J. D.; Russell, C. J.; Samajdar, A.; Sanidas, S. A.; Sardesai, S. C.; Schmiedekamp, A.; Schmiedekamp, C.; Schmitz, K.; Schult, L.; Sesana, A.; Shaifullah, G.; Shannon, R. M.; Shapiro-Albert, B. J.; Siemens, X.; Simon, J.; Singha, J.; Siwek, M. S.; Speri, L.; Spiewak, R.; Srivastava, A.; Stairs, I. H.; Stappers, B. W.; Stinebring, D. R.; Stovall, K.; Sun, J. P.; Surnis, M.; Susarla, S. C.; Susobhanan, A.; Swiggum, J. K.; Takahashi, K.; Tarafdar, P.; Taylor, J.; Taylor, S. R.; Theureau, G.; Thrane, E.; Thyagarajan, N.; Tiburzi, C.; Toomey, L.; Turner, J. E.; Unal, C.; Vallisneri, M.; van der Wateren, E.; van Haasteren, R.; Vecchio, A.; Krishnan, V. Venkatraman; Verbiest, J. P. W.; Vigeland, S. J.; Wahl, H. M.; Wang, S.; Wang, Q.; Witt, C. A.; Wang, J.; Wang, L.; Wayt, K. E.; Wu, Z.; Young, O.; Zhang, L.; Zhang, S.; Zhu, X. -J.; Zic, A.

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Comparing recent PTA results on the nanohertz stochastic gravitational wave background

The International Pulsar Timing Array Collaboration, Agazie, G., Antoniadis, J., Anumarlapudi, A., Archibald, A. M., Arumugam, P., et al. (in preparation). Comparing recent PTA results on the nanohertz stochastic gravitational wave background.

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The International Pulsar Timing Array Collaboration, Author
Agazie, G., Author
Antoniadis, J., Author
Anumarlapudi, A., Author
Archibald, A. M., Author
Arumugam, P., Author
Arumugam, S., Author
Arzoumanian, Z., Author
Askew, J., Author
Babak, S., Author
Bagchi, M., Author
Bailes, M., Author
Nielsen, A. -S. Bak, Author
Baker, P. T., Author
Bassa, C. G., Author
Bathula, A., Author
Bécsy, B., Author
Berthereau, A., Author
Bhat, N. D. R., Author
Blecha, L., Author
Bonetti, M., AuthorBortolas, E., AuthorBrazier, A., AuthorBrook, P. R., AuthorBurgay, M., AuthorBurke-Spolaor, S., AuthorBurnette, R., AuthorCaballero, R. N., AuthorCameron, A., AuthorCase, R., AuthorChalumeau, A., AuthorChampion, D. J., AuthorChanlaridis, S., AuthorCharisi, M., AuthorChatterjee, S., AuthorChatziioannou, K., AuthorCheeseboro, B. D., AuthorChen, S., AuthorChen, Z. -C., AuthorCognard, I., AuthorCohen, T., AuthorColes, W. A., AuthorCordes, J. M., AuthorCornish, N. J., AuthorCrawford, F., AuthorCromartie, H. T., AuthorCrowter, K., AuthorCuryło, M., AuthorCutler, C. J., AuthorDai, S., AuthorDandapat, S., AuthorDeb, D., AuthorDeCesar, M. E., AuthorDeGan, D., AuthorDemorest, P. B., AuthorDeng, H., AuthorDesai, S., AuthorDesvignes, G., AuthorDey, L., AuthorDhanda-Batra, N., AuthorDi Marco, V., AuthorDolch, T., AuthorDrachler, B., AuthorDwivedi, C., AuthorEllis, J. A., AuthorFalxa, M., AuthorFeng, Y., AuthorFerdman, R. D., AuthorFerrara, E. C., AuthorFiore, W., AuthorFonseca, E., AuthorFranchini, A., AuthorFreedman, G. E., AuthorGair, J. R.¹, Author Garver-Daniels, N., AuthorGentile, P. A., AuthorGersbach, K. A., AuthorGlaser, J., AuthorGood, D. C., AuthorGoncharov, B., AuthorGopakumar, A., AuthorGraikou, E., AuthorGrießmeier, J. -M., AuthorGuillemot, L., AuthorGültekin, K., AuthorGuo, Y. J., AuthorGupta, Y., AuthorGrunthal, K., AuthorHazboun, J. S., AuthorHisano, S., AuthorHobbs, G. B., AuthorHourihane, S., AuthorHu, H., AuthorIraci, F., AuthorIslo, K., AuthorIzquierdo-Villalba, D., AuthorJang, J., AuthorJawor, J., AuthorJanssen, G. H., AuthorJennings, R. J., AuthorJessner, A., AuthorJohnson, A. D., AuthorJones, M. L., AuthorJoshi, B. C., AuthorKaiser, A. R., AuthorKaplan, D. L., AuthorKapur, A., AuthorKareem, F., AuthorKaruppusamy, R., AuthorKeane, E. F., AuthorKeith, M. J., AuthorKelley, L. Z., AuthorKerr, M., AuthorKey, J. S., AuthorKharbanda, D., AuthorKikunaga, T., AuthorKlein, T. C., AuthorKolhe, N., AuthorKramer, M., AuthorKrishnakumar, M. A., AuthorKulkarni, A., AuthorLaal, N., AuthorLackeos, K., AuthorLam, M. T., AuthorLamb, W. G., AuthorLarsen, B. B., AuthorLazio, T. J. W., AuthorLee, K. J., AuthorLevin, Y., AuthorLewandowska, N., AuthorLittenberg, T. B., AuthorLiu, K., AuthorLiu, T., AuthorLiu, Y., AuthorLommen, A., AuthorLorimer, D. R., AuthorLower, M. E., AuthorLuo, J., AuthorLuo, R., AuthorLynch, R. S., AuthorLyne, A. G., AuthorMa, C. -P., AuthorMaan, Y., AuthorMadison, D. R., AuthorMain, R. A., AuthorManchester, R. N., AuthorMandow, R., AuthorMattson, M. A., AuthorMcEwen, A., AuthorMcKee, J. W., AuthorMcLaughlin, M. A., AuthorMcMann, N., AuthorMeyers, B. W., AuthorMeyers, P. M., AuthorMickaliger, M. B., AuthorMiles, M., AuthorMingarelli, C. M. F., AuthorMitridate, A., AuthorNatarajan, P., AuthorNathan, R. S., AuthorNg, C., AuthorNice, D. J., AuthorNiţu, I. C., AuthorNobleson, K., AuthorOcker, S. K., AuthorOlum, K. D., AuthorOsłowski, S., AuthorPaladi, A. K., AuthorParthasarathy, A., AuthorPennucci, T. T., AuthorPerera, B. B. P., AuthorPerrodin, D., AuthorPetiteau, A., AuthorPetrov, P., AuthorPol, N. S., AuthorPorayko, N. K., AuthorPossenti, A., AuthorPrabu, T., AuthorLeclere, H. Quelquejay, AuthorRadovan, H. A., AuthorRana, P., AuthorRansom, S. M., AuthorRay, P. S., AuthorReardon, D. J., AuthorRogers, A. F., AuthorRomano, J. D., AuthorRussell, C. J., AuthorSamajdar, A., AuthorSanidas, S. A., AuthorSardesai, S. C., AuthorSchmiedekamp, A., AuthorSchmiedekamp, C., AuthorSchmitz, K., AuthorSchult, L., AuthorSesana, A., AuthorShaifullah, G., AuthorShannon, R. M., AuthorShapiro-Albert, B. J., AuthorSiemens, X., AuthorSimon, J., AuthorSingha, J., AuthorSiwek, M. S., AuthorSperi, L.¹, Author Spiewak, R., AuthorSrivastava, A., AuthorStairs, I. H., AuthorStappers, B. W., AuthorStinebring, D. R., AuthorStovall, K., AuthorSun, J. P., AuthorSurnis, M., AuthorSusarla, S. C., AuthorSusobhanan, A., AuthorSwiggum, J. K., AuthorTakahashi, K., AuthorTarafdar, P., AuthorTaylor, J., AuthorTaylor, S. R., AuthorTheureau, G., AuthorThrane, E., AuthorThyagarajan, N., AuthorTiburzi, C., AuthorToomey, L., AuthorTurner, J. E., AuthorUnal, C., AuthorVallisneri, M., Authorvan der Wateren, E., Authorvan Haasteren, R.², Author Vecchio, A., AuthorKrishnan, V. Venkatraman, AuthorVerbiest, J. P. W., AuthorVigeland, S. J., AuthorWahl, H. M., AuthorWang, S., AuthorWang, Q., AuthorWitt, C. A., AuthorWang, J., AuthorWang, L., AuthorWayt, K. E., AuthorWu, Z., AuthorYoung, O., AuthorZhang, L., AuthorZhang, S., AuthorZhu, X. -J., AuthorZic, A., Author more..

Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, ou_1933290
2Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc

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 $1\sigma$. 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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Dates: Created: 2023-09-01

Publication Status: Not specified

Pages: 21 pages, 9 figures, submitted to ApJ

Publishing info: -

Table of Contents: -

Rev. Type: -

Identifiers: arXiv: 2309.00693

Degree: -

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