Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248
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 measure...
| Main Authors: | , , , , , , , , , , , , , , , |
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| Format: | Journal Article |
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Oxford University Press
2016
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| Online Access: | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/36109 |
| _version_ | 1848754678033022976 |
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| author | Tetarenko, A. Bahramian, A. Sivakoff, G. Tremou, E. Linares, M. Tudor, V. Miller-Jones, James Heinke, C. Chomiuk, L. Strader, J. Altamirano, D. Degenaar, N. Maccarone, T. Patruno, A. Sanna, A. Wijnands, R. |
| author_facet | Tetarenko, A. Bahramian, A. Sivakoff, G. Tremou, E. Linares, M. Tudor, V. Miller-Jones, James Heinke, C. Chomiuk, L. Strader, J. Altamirano, D. Degenaar, N. Maccarone, T. Patruno, A. Sanna, A. Wijnands, R. |
| author_sort | Tetarenko, A. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T08:44:13Z |
| format | Journal Article |
| id | curtin-20.500.11937-36109 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:44:13Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-361092022-11-23T06:41:29Z Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248 Tetarenko, A. Bahramian, A. Sivakoff, G. Tremou, E. Linares, M. Tudor, V. Miller-Jones, James Heinke, C. Chomiuk, L. Strader, J. Altamirano, D. Degenaar, N. Maccarone, T. Patruno, A. Sanna, A. Wijnands, R. 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. 2016 Journal Article http://hdl.handle.net/20.500.11937/36109 10.1093/mnras/stw1013 http://purl.org/au-research/grants/arc/FT140101082 Oxford University Press fulltext |
| spellingShingle | Tetarenko, A. Bahramian, A. Sivakoff, G. Tremou, E. Linares, M. Tudor, V. Miller-Jones, James Heinke, C. Chomiuk, L. Strader, J. Altamirano, D. Degenaar, N. Maccarone, T. Patruno, A. Sanna, A. Wijnands, R. Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248 |
| title | Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248 |
| title_full | Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248 |
| title_fullStr | Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248 |
| title_full_unstemmed | Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248 |
| title_short | Disc-jet coupling in the Terzan 5 neutron star X-ray binary EXO 1745-248 |
| title_sort | disc-jet coupling in the terzan 5 neutron star x-ray binary exo 1745-248 |
| url | http://purl.org/au-research/grants/arc/FT140101082 http://hdl.handle.net/20.500.11937/36109 |