Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248
MetadataShow full item record
We present the results of Very Large Array, Australia Telescope Compact Array, and Swift X-ray Telescope observations of the 2015 outburst of the transient neutron star X-ray binary (NSXB), EXO 1745-248, located in the globular cluster Terzan 5. Combining (near-) simultaneous radio and X-ray measurements, we measure a correlation between the radio and X-ray luminosities of LR ? LßX with ß = 1.68+0.10-0.09, linking the accretion flow (probed by X-ray luminosity) and the compact jet (probed by radio luminosity). While such a relationship has been studied in multiple black hole X-ray binaries (BHXBs), this work marks only the third NSXB with such a measurement. Constraints on this relationship in NSXBs are strongly needed, as comparing this correlation between different classes of XB systems is key in understanding the properties that affect the jet production process in accreting objects. Our best-fitting disc-jet coupling index for EXO 1745-248 is consistent with the measured correlation in NSXB 4U 1728-34 (ß = 1.5 ± 0.2) but inconsistent with the correlation we fit using the most recent measurements from the literature of NSXB Aql X-1 (ß = 0.76+0.14-0.15). While a similar disc-jet coupling index appears to hold across multiple BHXBs in the hard accretion state, this does not appear to be the case with the three NSXBs measured so far. Additionally, the normalization of the EXO 1745-248 correlation is lower than the other two NSXBs, making it one of the most radio faint XBs ever detected in the hard state. We also report the detection of a type-I X-ray burst during this outburst, where the decay time-scale is consistent with hydrogen burning.
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Showing items related by title, author, creator and subject.
Curran, Peter; Coriat, M.; Miller-Jones, James; Armstrong, R.; Edwards, P.; Sivakoff, G.; Woudt, P.; Altamirano, D.; Belloni, T.; Corbel, S.; Fender, R.; Kording, E.; Krimm, H.; Markoff, S.; Migliari, S.; Russell, D.; Stevens, J.; Tzioumis, T. (2014)Swift J1745-26 is an X-ray binary towards the Galactic Centre that was detected when it went into outburst in September 2012. This source is thought to be one of a growing number of sources that display “failed outbursts”, ...
Curran, P.; Coriat, M.; Miller-Jones, James; Armstrong, R.P.; Edwards, P.G.; Sivakoff, G.R.; Woudt, P.; Altamirano, D.; Belloni, T.M.; Corbel, S.; Fender, R.P.; Kording, E.G.; Krimm, H.A.; Markoff, S.; Migliari, S.; Russell, D.M.; Stevens, J.; Tzioumis, T. (2014)Swift J1745-26 is an X-ray binary towards the Galactic Centre that was detected when it went into outburst in September 2012. This source is thought to be one of a growing number of sources that display “failed outbursts”, ...
Tetarenko, A.; Sivakoff, G.; Miller-Jones, James; Curran, Peter; Russell, T.; Coulson, I.; Heinz, S.; Maitra, D.; Markoff, S.; Migliari, S.; Petitpas, G.; Rupen, M.; Rushton, A.; Russell, D.; Sarazin, C. (2015)We present the results of our observations of the early stages of the 2012–2013 outburst of the transient black hole X-ray binary (BHXRB), Swift J1745–26, with the Very Large Array, Submillimeter Array, and James Clerk ...