Physics – Nuclear Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nuphs.132..628m&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 132, p. 628-631.
Physics
Nuclear Physics
Scientific paper
Atoll-type neutron star (NS) X-ray binaries share lots of properties with low/hard state black hole candidates (BHC) and are therefore the key sources for our understanding of the differences and similarities in the disc-jet connection of BHC and NS systems and the physical processes involved. We present the analysis of simultaneous radio (VLA) and X-ray (RXTE) observations of three atoll sources: 4U 1728-34, 4U 1820-30 and Ser X-1 (first radio detection). In 4U 1728-34 we find a significant correlation between radio and X-ray flux and, for the first time in an X-ray binary, a significant quantitative correlation between radio flux and X-ray timing features. As in BHCs it seems that also in atolls (i.e. in 4U 1820-30, Ser X-1 and in one observation of 4U 1728-34) the radio emission is 'quenched' above a certain luminosity, when the sources are in a softer state.
Fender Rob P.
Hjellming Robert M.
Homan Jeroen
Jonker Peter G.
Klein-Wolt Marc
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