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Title:
New Limits on Radio Emission from X-ray Dim Isolated Neutron Stars [ Erratum: 2010ApJ...708..910K ]
Authors:
Kondratiev, V. I.; McLaughlin, M. A.; Lorimer, D. R.; Burgay, M.; Possenti, A.; Turolla, R.; Popov, S. B.; Zane, S.
Affiliation:
AA(Department of Physics, West Virginia University, 210 Hodges Hall, Morgantown, WV 26506, USA ; National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944, USA ; Astro Space Center of the Lebedev Physical Institute, Profsoyuznaya str. 84/32, Moscow 117997, Russia ; ), AB(Department of Physics, West Virginia University, 210 Hodges Hall, Morgantown, WV 26506, USA ; National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944, USA ; Alfred P. Sloan Research Fellow.; ), AC(Department of Physics, West Virginia University, 210 Hodges Hall, Morgantown, WV 26506, USA ; National Radio Astronomy Observatory, P.O. Box 2, Green Bank, WV 24944, USA ; ), AD(INAF-Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra (CA), Italy ), AE(INAF-Osservatorio Astronomico di Cagliari, Loc. Poggio dei Pini, Strada 54, 09012 Capoterra (CA), Italy ), AF(Department of Physics, University of Padua, via Marzolo 8, 35131 Padova, Italy ; Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK ; ), AG(Sternberg Astronomical Institute, Universitetski pr. 13, Moscow 119992, Russia ), AH(Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK )
Publication:
The Astrophysical Journal, Volume 702, Issue 1, pp. 692-706 (2009). (ApJ Homepage)
Publication Date:
09/2009
Origin:
IOP
ApJ Keywords:
methods: data analysis, stars: neutron
DOI:
10.1088/0004-637X/702/1/692
Bibliographic Code:
2009ApJ...702..692K

Abstract

We have carried out a search for radio emission at 820 MHz from six X-ray dim isolated neutron stars (XDINSs) with the Robert C. Byrd Green Bank Radio Telescope. No transient or pulsed emission was found using fast folding, fast Fourier transform, and single-pulse searches. The corresponding flux limits are about 0.01 mJy for pulsed emission, depending on the integration time for the particular source and assuming a duty cycle of 2%, and 20 mJy for single dispersed pulses. These are the most sensitive limits to date on radio emission from XDINSs. There is no evidence for isolated radio pulses, as seen in a class of neutron stars known as rotating radio transients. Our results imply that either the radio luminosities of these objects are lower than those of any known radio pulsars, or they could simply be long-period nearby radio pulsars with high magnetic fields beaming away from the Earth. To test the latter possibility, we would need around 40 similar sources to provide a 1σ probability of at least one of them beaming toward us. We also give a detailed description of our implementation of the Fast Folding Algorithm.

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