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dc.contributor.authorMiller-Jones, James
dc.contributor.authorJonker, P.
dc.contributor.authorRatti, E.
dc.contributor.authorTorres, M.
dc.contributor.authorBrocksopp, C.
dc.contributor.authorYang, J.
dc.contributor.authorMorrell, N.
dc.identifier.citationMiller-Jones, J. and Jonker, P. and Ratti, E. and Torres, M. and Brocksopp, C. and Yang, J. and Morrell, N. 2011. An accurate position for the black hole candidate XTE J1752-223: re-interpretation of the VLBI data. Monthly Notices of the Royal Astronomical Society. 415 (1): pp. 306-312.

Using high-precision astrometric optical observations from the Walter Baade Magellan Telescope in conjunction with high-resolution very long baseline interferometric (VLBI) radio imaging with the Very Long Baseline Array (VLBA), we have located the core of the X-ray binary system XTE J1752-223. Compact radio emission from the core was detected following the state transition from the soft to the hard X-ray state. Its position to the south-east of all previously detected jet components mandated a re-analysis of the existing VLBI data. Our analysis suggests that the outburst comprised at least two ejection events prior to 2010 February 26. No radio-emitting components were detected to the south-east of the core at any epoch, suggesting that the receding jets were Doppler-deboosted below our sensitivity limit. From the ratio of the brightness of the detected components to the measured upper limits for the receding ejecta, we constrain the jet speed ß > 0.66 and the inclination angle to the line of sight ? < 49°. Assuming that the initial ejection event occurred at the transition from the hard intermediate state to the soft intermediate state, an initial period of ballistic motion followed by a Sedov phase (i.e. self-similar adiabatic expansion) appears to fit the motion of the ejecta better than a uniform deceleration model. The accurate core location can provide a long time baseline for a future proper motion determination should the system show a second outburst, providing insights into the formation mechanism of the compact object.

dc.publisherWiley-Blackwell Publishing Ltd.
dc.subjectradio continuum: stars
dc.subjectstars: individual: XTE J1752-223
dc.subjectX-rays: binaries
dc.subjectISM: jets and outflows
dc.titleAn accurate position for the black hole candidate XTE J1752-223: re-interpretation of the VLBI data
dc.typeJournal Article
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.departmentCurtin Institute of Radio Astronomy
curtin.accessStatusFulltext not available

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