期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 478, 期 1, 页码 218-227出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/sty1116
关键词
gravitational waves; binaries: general; stars: black holes; stars: neutron; pulsars: individual: PSR J1713+0747; quasars: supermassive black holes
资金
- Science & Technology Facilities Council (STFC) in the UK
- 'Programme National de Cosmologie et Galaxies' (PNCG) of CNRS/INSU, France
- Netherlands Organisation for Scientific Research, NWO
- ERC Advanced Grant 'LEAP' [227947]
- European Research Council [610058]
- Alexander von Humboldt Foundation
- Australian Research Council grant Laureate Fellowship [FL50100148]
- Royal Society
- Netherlands Organization for Scientific Research, NWO [TOP2.614.001.602]
- NANOGrav project
- National Science Foundation Physics Frontier Center [1430284]
- STFC [ST/P000649/1] Funding Source: UKRI
We search for continuous gravitational waves (CGWs) produced by individual supermassive black hole binaries in circular orbits using high-cadence timing observations of PSR J1713+0747. We observe this millisecond pulsar using the telescopes in the European Pulsar Timing Array with an average cadence of approximately 1.6 d over the period between 2011 April and 2015 July, including an approximately daily average between 2013 February and 2014 April. The high-cadence observations are used to improve the pulsar timing sensitivity across the gravitational wave frequency range of 0.008-5 mu Hz. We use two algorithms in the analysis, including a spectral fitting method and a Bayesian approach. For an independent comparison, we also use a previously published Bayesian algorithm. We find that the Bayesian approaches provide optimal results and the timing observations of the pulsar place a 95 per cent upper limit on the sky-averaged strain amplitude of CGWs to be less than or similar to 3.5 x 10(-13) at a reference frequency of 1 mu Hz. We also find a 95 per cent upper limit on the sky-averaged strain amplitude of low-frequency CGWs to be less than or similar to 1.4 x 10(-14) at a reference frequency of 20 nHz.
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