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A radio parallax to the black hole X-ray binary MAXI J1820+070

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Open access
Authors
Atri, P.
Miller-Jones, James
Bahramian, A.
Plotkin, Richard
Deller, A.T.
Jonker, P.G.
Maccarone, T.J.
Sivakoff, G.R.
Soria, R.
Altamirano, D.
Belloni, T.
Fender, R.
Koerding, E.
Maitra, D.
Markoff, S.
Migliari, S.
Russell, D.
Russell, T.
Sarazin, C.L.
Tetarenko, A.J.
Tudose, V.
Date
2020
Type
Journal Article

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Atri, P. and Miller-Jones, J.C.A. and Bahramian, A. and Plotkin, R.M. and Deller, A.T. and Jonker, P.G. and Maccarone, T.J. et al. 2020. A radio parallax to the black hole X-ray binary MAXI J1820+070. Monthly Notices of the Royal Astronomical Society: Letters. 493 (1): pp. L81-L86.
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Monthly Notices of the Royal Astronomical Society: Letters
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Faculty
Faculty of Science and Engineering
School
School of Elec Eng, Comp and Math Sci (EECMS)
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Copyright © 2020 The American Astronomical Society. All rights reserved.

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Abstract

© 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. 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.