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http://hdl.handle.net/2445/99393
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DC Field | Value | Language |
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dc.contributor.author | Migliari, Simone | - |
dc.contributor.author | Fender, R. P. | - |
dc.contributor.author | Rupen, M. P. | - |
dc.contributor.author | Wachter, S. | - |
dc.contributor.author | Jonker, P. G. | - |
dc.contributor.author | Homan, J. | - |
dc.contributor.author | Van der Klis, M. | - |
dc.date.accessioned | 2016-06-09T14:02:13Z | - |
dc.date.available | 2016-06-09T14:02:13Z | - |
dc.date.issued | 2004-06 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/2445/99393 | - |
dc.description.abstract | We present the analysis of simultaneous X-ray (RXTE) and radio (VLA) observations of two atoll-type neutron star X-ray binaries: 4U 1820 - 30 and Ser X-1. Both sources were steadily in the soft (`banana') X-ray state during the observations. We have detected the radio counterpart of 4U 1820 - 30 at 4.86 and 8.46 GHz at a flux density of ~0.1 mJy. This radio source is positionally coincident with the radio pulsar PSR 1820 - 30A. However, the radio emission of the pulsar falls rapidly with frequency (~ν-3), and we argue that the radio emission of the X-ray binary is dominant above ~2 GHz. Supporting this interpretation, comparison with previous observations reveals variability at the higher radio frequencies that is likely to be due to the X-ray binary. We have detected for the first time the radio counterpart of Ser X-1 at 8.46 GHz, also at a flux density of ~0.1 mJy. The position of the radio counterpart has allowed us to identify its optical counterpart unambiguously. We briefly discuss similarities and differences between the disc-jet coupling in neutron star and black hole X-ray binaries. In particular, we draw attention to the fact that, contrary to other states, neutron star X-ray binaries seem to be more radio-loud than persistent black hole candidates when the emission is `quenched' in the soft state. | - |
dc.format.extent | 7 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Royal Astronomical Society | - |
dc.relation.isformatof | Reproducció del document publicat a: http://dx.doi.org/10.1111/j.1365-2966.2004.07768.x | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society, 2004, vol. 351, num. 1, p. 186-192 | - |
dc.relation.uri | http://dx.doi.org/10.1111/j.1365-2966.2004.07768.x | - |
dc.rights | (c) Migliari, Simone et al., 2004 | - |
dc.source | Articles publicats en revistes (Física Quàntica i Astrofísica) | - |
dc.subject.classification | Estels binaris de raigs X | - |
dc.subject.classification | Estels de neutrons | - |
dc.subject.classification | Astronomia de raigs X | - |
dc.subject.other | X-ray binaries | - |
dc.subject.other | Neutron stars | - |
dc.subject.other | X-ray astronomy | - |
dc.title | Radio detections of the neutron star X-ray binaries 4U 1820 - 30 and Ser X-1 in soft X-ray states | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/publishedVersion | - |
dc.identifier.idgrec | 634035 | - |
dc.date.updated | 2016-06-09T14:02:18Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
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634035.pdf | 356.04 kB | Adobe PDF | View/Open |
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