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A precise measurement of the magnetic field in the corona of the black hole binary V404 Cygni

2017; American Association for the Advancement of Science; Volume: 358; Issue: 6368 Linguagem: Inglês

10.1126/science.aan0249

1095-9203

Yigit Dallilar, Stephen S. Eikenberry, Alan Garner, R. Deno Stelter, Amy Gottlieb, P. Gandhi, P. Casella, V. S. Dhillon, Tom Marsh, S. P. Littlefair, Liam Hardy, R. P. Fender, K. P. Mooley, D. J. Walton, F. Fuerst, Matteo Bachetti, A. J. Castro–Tirado, Miguel Charcos, Michelle L. Edwards, N. M. Lasso-Cabrera, A. Marín-Franch, S. N. Raines, K. Ackley, John G. Bennett, A. J. Cenarro, Brian Chinn, H. Veronica Donoso, Raymond Frommeyer, Kevin Hanna, Michael D. Herlevich, Jeff Julian, Paola Miller, Scott A. Mullin, Charles H. Murphey, C. Packham, F. Városi, Claudia Vega, C. Warner, A. N. Ramaprakash, Mahesh Burse, Sujit Punnadi, Pravin Chordia, Andreas Gerarts, Héctor de Paz Martín, María Martín Calero, R. Scarpa, Sergio Fernandez Acosta, William Miguel Hernández Sánchez, Benjamin M. Siegel, Francisco Francisco Pérez, Himar D. Viera Martín, José A. Rodríguez Losada, Agustín Núñez, A. Tejero, Carlos E. Martín González, César Cabrera Rodríguez, Jordi Molgó, J. Esteban Rodriguez, J. Israel Fernández Cáceres, Luis A. Rodríguez García, Manuel Huertas Lopez, Raul Dominguez, Tim Gaggstatter, A. Cabrera Lavers, S. Geier, Peter Pessev, Ata Sarajedini,

Pulsars and Gravitational Waves Research

Observations of binary stars containing an accreting black hole or neutron star often show x-ray emission extending to high energies (>10 kilo--electron volts), which is ascribed to an accretion disk corona of energetic particles akin to those seen in the solar corona. Despite their ubiquity, the physical conditions in accretion disk coronae remain poorly constrained. Using simultaneous infrared, optical, x-ray, and radio observations of the Galactic black hole system V404 Cygni, showing a rapid synchrotron cooling event in its 2015 outburst, we present a precise 461 ± 12 gauss magnetic field measurement in the corona. This measurement is substantially lower than previous estimates for such systems, providing constraints on physical models of accretion physics in black hole and neutron star binary systems.