دورية أكاديمية
Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search
| العنوان: | Common-red-signal analysis with 24-yr high-precision timing of the European Pulsar Timing Array: inferences in the stochastic gravitational-wave background search |
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| المؤلفون: | Chen, S., Caballero, R.N., Guo, Y.J., Chalumeau, A., Liu, K., Shaifullah, G., Lee, K.J., Babak, S., Desvignes, G., Parthasarathy, A., Hu, H., van Der Wateren, E., Antoniadis, J., Nielsen, A.-S. Bak, Bassa, C.G., Berthereau, A., Burgay, M., Champion, D.J., Cognard, I., Falxa, M., Ferdman, R.D., Freire, P.C.C., Gair, J.R., Graikou, E., Guillemot, L., Jang, J., Janssen, G.H., Karuppusamy, R., Keith, M.J., Kramer, M., Liu, X.J., Lyne, A.G., Main, R.A., Mckee, J.W., Mickaliger, M.B., Perera, B.B.P., Perrodin, D., Petiteau, A., Porayko, N.K., Possenti, A., Samajdar, A., Sanidas, S.A., Sesana, A., Speri, L., Stappers, B.W., Theureau, G., Tiburzi, C., Vecchio, A., Verbiest, J.P.W., Wang, J., Wang, L., Xu, H. |
| المساهمون: | Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (LPC2E), Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Centre National d’Études Spatiales Paris (CNES), Unité Scientifique de la Station de Nançay (USN), Université Paris Sciences et Lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS), AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA (UMR_8109)), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Laboratoire Univers et Théories (LUTH (UMR_8102)), Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), EPTA, ANR-18-CE31-0015,PTA-France,Recherche d'ondes gravitationnelles avec un réseau de pulsars en France(2018) |
| المصدر: | Mon.Not.Roy.Astron.Soc. ; https://hal.science/hal-03434050Test ; Mon.Not.Roy.Astron.Soc., 2021, 508 (4), pp.4970-4993. ⟨10.1093/mnras/stab2833⟩ |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2021 |
| مصطلحات موضوعية: | gravitational waves, methods: data analysis, pulsars: general, [SDU]Sciences of the Universe [physics], [SDU.ASTR]Sciences of the Universe [physics]/Astrophysics [astro-ph] |
| الوصف: | International audience ; We present results from the search for a stochastic gravitational-wave background (GWB) as predicted by the theory of General Relativity using six radio millisecond pulsars from the Data Release 2 (DR2) of the European Pulsar Timing Array (EPTA) covering a timespan up to 24 yr. A GWB manifests itself as a long-term low-frequency stochastic signal common to all pulsars, a common red signal (CRS), with the characteristic Hellings-Downs (HD) spatial correlation. Our analysis is performed with two independent pipelines, ENTERPRISE, and TEMPONEST+FORTYTWO, which produce consistent results. A search for a CRS with simultaneous estimation of its spatial correlations yields spectral properties compatible with theoretical GWB predictions, but does not result in the required measurement of the HD correlation, as required for GWB detection. Further Bayesian model comparison between different types of CRSs, including a GWB, finds the most favoured model to be the common uncorrelated red noise described by a power law with A=5.13+4.20−2.73×10−15 and γ=3.78+0.69−0.59 (95 per cent credible regions). Fixing the spectral index to γ = 13/3 as expected from the GWB by circular, inspiralling supermassive black hole binaries results in an amplitude of A=2.95+0.89−0.72×10−15. We implement three different models, BAYESEPHEM, LINIMOSS, and EPHEMGP, to address possible Solar system ephemeris (SSE) systematics and conclude that our results may only marginally depend on these effects. This work builds on the methods and models from the studies on the EPTA DR1. We show that under the same analysis framework the results remain consistent after the data set extension. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| العلاقة: | info:eu-repo/semantics/altIdentifier/arxiv/2110.13184; hal-03434050; https://hal.science/hal-03434050Test; https://hal.science/hal-03434050/documentTest; https://hal.science/hal-03434050/file/stab2833.pdfTest; ARXIV: 2110.13184; INSPIRE: 1952483 |
| DOI: | 10.1093/mnras/stab2833 |
| الإتاحة: | https://doi.org/10.1093/mnras/stab2833Test https://hal.science/hal-03434050Test https://hal.science/hal-03434050/documentTest https://hal.science/hal-03434050/file/stab2833.pdfTest |
| حقوق: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.19BAEB64 |
| قاعدة البيانات: | BASE |
| DOI: | 10.1093/mnras/stab2833 |
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