A1 Refereed original research article in a scientific journal
Rapid compact jet quenching in the Galactic black hole candidate X-ray binary MAXI J1535-571
Authors: T. D. Russell, M. Lucchini, A. J. Tetarenko, J. C. A. Miller-Jones, G. R. Sivakoff, F. Krauß, W. Mulaudzi, M. C. Baglio, D. M. Russell, D. Altamirano, C. Ceccobello, S. Corbel, N. Degenaar, J. van den Eijnden, R. Fender, S. Heinz, K. I. I. Koljonen , D. Maitra, S. Markoff , S. Migliari, A. S. Parikh, R. M. Plotkin , M. Rupen, C. Sarazin, R. Soria, R. Wijnands
Publisher: OXFORD UNIV PRESS
Publication year: 2020
Journal: Monthly Notices of the Royal Astronomical Society
Journal name in source: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Journal acronym: MON NOT R ASTRON SOC
Volume: 498
Issue: 4
First page : 5772
Last page: 5785
Number of pages: 14
ISSN: 0035-8711
eISSN: 1365-2966
DOI: https://doi.org/10.1093/mnras/staa2650
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/50605760
We present results from six epochs of quasi-simultaneous radio, (sub-)millimetre, infrared, optical, and X-ray observations of the black hole X-ray binary MAXI J1535-571. These observations show that as the source transitioned through the hard-intermediate X-ray state towards the soft-intermediate X-ray state, the jet underwent dramatic and rapid changes. We observed the frequency of the jet spectral break, which corresponds to the most compact region in the jet where particle acceleration begins (higher frequencies indicate closer to the black hole), evolves from the infrared band into the radio band (decreasing by approximate to 3 orders of magnitude) in less than a day. During one observational epoch, we found evidence of the jet spectral break evolving in frequency through the radio band. Estimating the magnetic field and size of the particle acceleration region shows that the rapid fading of the high-energy jet emission was not consistent with radiative cooling; instead, the particle acceleration region seems to be moving away from the black hole on approximately dynamical time-scales. This result suggests that the compact jet quenching is not caused by local changes to the particle acceleration, rather we are observing the acceleration region of the jet travelling away from the black hole with the jet flow. Spectral analysis of the X-ray emission shows a gradual softening in the few days before the dramatic jet changes, followed by a more rapid softening similar to 1-2 d after the onset of the jet quenching.
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