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http://hdl.handle.net/20.500.12386/24248| Title: | Limits on Anisotropy in the Nanohertz Stochastic Gravitational Wave Background | Authors: | Taylor, S. R. Mingarelli, C. M. F. Gair, J. R. Sesana, A. Theureau, G. Babak, S. Bassa, C. G. Brem, P. BURGAY, MARTA Caballero, R. N. Champion, D. J. Cognard, I. Desvignes, G. Guillemot, L. Hessels, J. W. T. Janssen, G. H. Karuppusamy, R. Kramer, M. Lassus, A. Lazarus, P. Lentati, L. Liu, K. Osłowski, S. PERRODIN, DELPHINE Petiteau, A. POSSENTI, ANDREA Purver, M. B. Rosado, P. A. Sanidas, S. A. Smits, R. Stappers, B. TIBURZI, Caterina van Haasteren, R. Vecchio, A. Verbiest, J. P. W. EPTA Collaboration |
Issue Date: | 2015 | Journal: | PHYSICAL REVIEW LETTERS | Number: | 115 | Issue: | 4 | First Page: | 041101 | Abstract: | The paucity of observed supermassive black hole binaries (SMBHBs) may imply that the gravitational wave background (GWB) from this population is anisotropic, rendering existing analyses suboptimal. We present the first constraints on the angular distribution of a nanohertz stochastic GWB from circular, inspiral-driven SMBHBs using the 2015 European Pulsar Timing Array data. Our analysis of the GWB in the ̃2 - 90 nHz band shows consistency with isotropy, with the strain amplitude in l >0 spherical harmonic multipoles ≲40 % of the monopole value. We expect that these more general techniques will become standard tools to probe the angular distribution of source populations. | Acknowledgments: | This work was carried out under the aegis of the EPTA. Part of this work is based on observations with the 100-m telescope of the Max-Planck-Institut für Radioastronomie (MPIfR) at Effelsberg. The Nançay Radio Observatory is operated by the Paris Observatory, associated to the French Centre National de la Recherche Scientifique (CNRS). We acknowledge financial support from “Programme National de Cosmologie and Galaxies” (PNCG) of CNRS/INSU, France. Pulsar research at the Jodrell Bank Centre for Astrophysics and the observations using the Lovell telescope is supported by a consolidated grant from the STFC in the UK. The Westerbork Synthesis Radio Telescope is operated by the Netherlands Institute for Radio Astronomy (ASTRON) with support from The Netherlands Foundation for Scientific Research NWO. S. R. T. acknowledges the support of the STFC and the RAS. This research was in part supported by S. R. T’s appointment to the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by Oak Ridge Associated Universities through a contract with NASA. C. M. F. M. was supported by a Marie Curie International Outgoing Fellowship within the 7th European Community Framework Programme. This research was performed in part using the Zwicky computer cluster at Caltech supported by NSF under MRI-R2 award No. PHY-0960291 and by the Sherman Fairchild Foundation. This work was in part performed using the Darwin Supercomputer of the University of Cambridge High Performance Computing Service, provided by Dell Inc. using Strategic Research Infrastructure Funding from the Higher Education Funding Council for England and funding from the STFC. A. S. and J. G. are supported by the Royal Society. L. L. was supported by a Junior Research Fellowship at Trinity Hall College, Cambridge University. S. A. S. acknowledges funding from an NWO Vidi fellowship (PI: J. W. T. H.). R. N. C. acknowledges the support of the International Max Planck Research School Bonn/Cologne and the Bonn-Cologne Graduate School. K. J. L. is supported by the National Natural Science Foundation of China (Grant No. 11373011). R. vH. is supported by NASA Einstein Fellowship grant PF3-140116. J. W. T. H. acknowledges funding from an NWO Vidi fellowship and ERC Starting Grant ‘DRAGNET’ (337062). P. L. acknowledges the support of the International Max Planck Research School Bonn/Cologne. K. L. acknowledges the financial support by the European Research Council for the ERC Synergy Grant BlackHoleCam under Contract No. 610058. S. O. is supported by the Alexander von Humboldt Foundation. The authors also acknowledge support of NSF Award No. PHY-1066293 and the hospitality of the Aspen Center for Physics. | URI: | http://hdl.handle.net/20.500.12386/24248 | URL: | https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.041101 | ISSN: | 0031-9007 | DOI: | 10.1103/PhysRevLett.115.041101 | Bibcode ADS: | 2015PhRvL.115d1101T | Fulltext: | open |
| Appears in Collections: | 1.01 Articoli in rivista |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| Taylor2015editorial.pdf | PDF editoriale | 18.77 MB | Adobe PDF | View/Open |
| 24248-Taylor2015editorial_P01.pdf | Miur | 9.3 MB | Adobe PDF | |
| 24248-Taylor2015editorial_P02.pdf | Miur | 9.5 MB | Adobe PDF |
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