@article{c65c080edf034ed68016c3fd22ea26c2,
title = "A radio parallax to the black hole X-ray binary MAXI J1820+070",
abstract = "Using the Very Long Baseline Array and the European Very Long Baseline Interferometry Network, we have made a precise measurement of the radio parallax of the black hole X-ray binary MAXI J1820+070, providing a model-independent distance to the source. Our parallax measurement of (0.348 ± 0.033) mas for MAXI J1820+070 translates to a distance of (2.96 ± 0.33) kpc. This distance implies that the source reached (15 ± 3) per cent of the Eddington luminosity at the peak of its outburst. Further, we use this distance to refine previous estimates of the jet inclination angle, jet velocity, and the mass of the black hole in MAXI J1820+070 to be (63 ± 3)°, (0.89 ± 0.09) c, and (9.2 ± 1.3) M?, respectively.",
keywords = "X-rays: binaries, astrometry, high angular resolution, parallaxes, radio continuum: transients, stars: black holes",
author = "P. Atri and Miller-Jones, {J. C.A.} and A. Bahramian and Plotkin, {R. M.} and Deller, {A. T.} and Jonker, {P. G.} and Maccarone, {T. J.} and Sivakoff, {G. R.} and R. Soria and D. Altamirano and T. Belloni and R. Fender and E. Koerding and D. Maitra and S. Markoff and S. Migliari and D. Russell and T. Russell and Sarazin, {C. L.} and Tetarenko, {A. J.} and V. Tudose",
note = "Funding Information: We would like to thank J. S. Bright for allowing us to use their work prior to publication that helped us uniquely solve for the jet parameters in Section 4.2. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The EVN is a joint facility of independent European, African, Asian, and North American radio astronomy institutes. Scientific results from data presented in this publication are derived from the following EVN project code(s): EA062. e-VLBI research infrastructure in Europe is supported by the European Union Seventh Framework Programme (FP7/2007–2013) under grant agreement number RI-261525 NEXPReS. JCAM-J is the recipient of an Australian Research Council Future Fellowship (FT140101082), funded by the Australian government. PGJ acknowledges funding from the European Research Council under ERC Consolidator Grant agreement no. 647208. GRS acknowledges support from a NSERC Discovery Grant (RGPIN-06569-2016). DA acknowledges support from the Royal Society. TDR acknowledges support from a Netherlands Organisation for Scientific Research (NWO) Veni Fellowship. VT is supported by programme Laplas VI of the Romanian National Authority for Scientific Research. Publisher Copyright: {\textcopyright} 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society.",
year = "2020",
month = jan,
day = "28",
doi = "10.1093/mnrasl/slaa010",
language = "English",
volume = "493",
pages = "L81--L86",
journal = "Monthly Notices of the Royal Astronomical Society: Letters",
issn = "1745-3933",
number = "1",
}