Astrometric observations of x-ray binaries using very long baseline interferometry
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I review the astrophysical insights arising from high-precision astrometric observations of X-ray binary systems, focussing primarily (but not exclusively) on recent results with very long baseline interferometry. Accurate, model-independent distances from geometric parallax measurements can help determine physical parameters of the host binary system and constrain black hole spins via broadband X-ray spectral modelling. Long-term proper motion studies, combined with binary evolution calculations, can provide observational constraints on the formation mechanism of black holes. Finally, the astrometric residuals from parallax and proper motion fits can provide information on orbital sizes and jet physics. I end by discussing prospects for future progress in this field.
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Curran, Peter; Chaty, S.; Heras, J. (2012)Context: While the sources of X-ray and radio emission in the different states of low-mass X-ray binaries are relatively well understood, the origin of the near-infrared (NIR) and optical emission is more often debated. ...
Bahramian, A.; Heinke, C.; Tudor, Vlad; Miller-Jones, James; Bogdanov, S.; Maccarone, T.; Knigge, C.; Sivakoff, G.; Chomiuk, L.; Strader, J.; Garcia, J.; Kallman, T. (2017)47 Tuc X9 is a low-mass X-ray binary (LMXB) in the globular cluster 47 Tucanae, and was previously thought to be a cataclysmic variable. However, Miller-Jones et al. recently identified a radio counterpart to X9 (inferring ...
Tudose, V.; Fender, R.; Garrett, M.; Miller-Jones, James; Paragi, Z.; Spencer, R.; Pooley, G.; van der Klis, M.; Szomoru, A. (2007)We report the results of the first two 5-GHz electronic very-long-baseline interferometry (e-VLBI) observations of the X-ray binary Cygnus X-3 using the European VLBI Network. Two successful observing sessions were held, ...