Artigo Acesso aberto Revisado por pares

Searching for continuous Gravitational Waves in the second data release of the International Pulsar Timing Array

2023; Oxford University Press; Volume: 521; Issue: 4 Linguagem: Inglês

10.1093/mnras/stad812

ISSN

1365-2966

Autores

M. Falxa, S. Babak, P. T. Baker, B. Bécsy, A. Chalumeau, Siyuan Chen, Zu-Cheng Chen, N. Cornish, L. Guillemot, Jeffrey S. Hazboun, Chiara M. F. Mingarelli, A. Parthasarathy, Antoine Petiteau, Nihan S. Pol, Alberto Sesana, S. B. Spolaor, Stephen R. Taylor, G. Theureau, Michele Vallisneri, Sarah J. Vigeland, Caitlin A. Witt, X. J. Zhu, John Antoniadis, Zaven Arzoumanian, M. Bailes, N. D. R. Bhat, Laura Blecha, Adam Brazier, Paul R. Brook, R. N. Caballero, A D Cameron, J. Andrew Casey-Clyde, D. J. Champion, Maria Charisi, Shami Chatterjee, I. Cognard, J. M. Cordes, F. Crawford, H. Thankful Cromartie, Kathryn Crowter, Shi Dai, Megan E. DeCesar, Paul Demorest, G. Desvignes, Timothy Dolch, Brendan Drachler, Yi Feng, E. C. Ferrara, William Fiore, Emmanuel Fonseca, N. Garver-Daniels, Joseph Glaser, B. Goncharov, Deborah C. Good, J.‐M. Grießmeier, Y. J. Guo, Kayhan Gültekin, G. Hobbs, H. Hu, Kristina Islo, J. Jang, Ross J. Jennings, Aaron D. Johnson, Megan L. Jones, Jane Kaczmarek, Andrew R. Kaiser, D. L. Kaplan, M. J. Keith, Luke Zoltan Kelley, M. Kerr, J. S. Key, Nima Laal, Michael T. Lam, William G. Lamb, T. Joseph W. Lazio, Kuo Liu, Tingting Liu, Jing Luo, Ryan S. Lynch, Dustin R. Madison, Robert Main, R. N. Manchester, Alexander McEwen, James W. McKee, M. A. McLaughlin, Cherry Ng, D. J. Nice, Stella Koch Ocker, Ken D. Olum, S. Osłowski, Timothy T. Pennucci, B. B. P. Perera, D. Perrodin, N. K. Porayko, Andrea Possenti, H. Quelquejay-Leclere, S. M. Ransom, Paul S. Ray, Daniel J. Reardon, Craig Russell, A. Samajdar, John Sarkissian, Levi Schult, G. Shaifullah, R. M. Shannon, Brent J. Shapiro-Albert, Xavier Siemens, Joseph Simon, Magdalena S. Siwek, Tristan L. Smith, Lorenzo Speri, R. Spiewak, I. H. Stairs, B. W. Stappers, Daniel R. Stinebring, Joseph K. Swiggum, C. Tiburzi, Jacob E. Turner, A. Vecchio, J. P. W. Verbiest, Haley M. Wahl, Shuangqiang Wang, J Wang, J. Wang, Ziwei Wu, Lei Zhang, S Zhang,

Tópico(s)

Cosmology and Gravitation Theories

Resumo

ABSTRACT The International Pulsar Timing Array 2nd data release is the combination of data sets from worldwide collaborations. In this study, we search for continuous waves: gravitational wave signals produced by individual supermassive black hole binaries in the local universe. We consider binaries on circular orbits and neglect the evolution of orbital frequency over the observational span. We find no evidence for such signals and set sky averaged 95 per cent upper limits on their amplitude h95. The most sensitive frequency is 10 nHz with h95 = 9.1 × 10−15. We achieved the best upper limit to date at low and high frequencies of the PTA band thanks to improved effective cadence of observations. In our analysis, we have taken into account the recently discovered common red noise process, which has an impact at low frequencies. We also find that the peculiar noise features present in some pulsars data must be taken into account to reduce the false alarm. We show that using custom noise models is essential in searching for continuous gravitational wave signals and setting the upper limit.

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