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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Disk, Corona, Jet Connection in the Intermediate State of MAXI J1820+070 Revealed by NICER Spectral-timing Analysis
Astrophysical Journal Letters, Volume 910, No. 1, Article L3, Year 2021
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Description
We analyze five epochs of Neutron star Interior Composition Explorer (NICER) data of the black hole X-ray binary MAXI J1820+070 during the bright hard-to-soft state transition in its 2018 outburst with both reflection spectroscopy and Fourier-resolved timing analysis. We confirm the previous discovery of reverberation lags in the hard state, and find that the frequency range where the (soft) reverberation lag dominates decreases with the reverberation lag amplitude increasing during the transition, suggesting an increasing X-ray emitting region, possibly due to an expanding corona. By jointly fitting the lag-energy spectra in a number of broad frequency ranges with the reverberation model reltrans, we find the increase in reverberation lag is best described by an increase in the X-ray coronal height. This result, along with the finding that the corona contracts in the hard state, suggests a close relationship between spatial extent of the X-ray corona and the radio jet. We find the corona expansion (as probed by reverberation) precedes a radio flare by ∼5 days, which may suggest that the hard-to-soft transition is marked by the corona expanding vertically and launching a jet knot that propagates along the jet stream at relativistic velocities. © 2021. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Mastroserio, Guglielmo
United States, Pasadena
California Institute of Technology
Kara, Erin A.
United States, Cambridge
Massachusetts Institute of Technology
García, Javier A.
United States, Pasadena
California Institute of Technology
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Ingram, Adam R.
United Kingdom, Oxford
University of Oxford
van der Klis, Michiels D.
Netherlands, Amsterdam
Universiteit Van Amsterdam
Dauser, Thomas
Germany, Erlangen
Friedrich-alexander-universität Erlangen-nürnberg
Steiner, James F.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Buisson, Douglas J.K.
United Kingdom, Southampton
University of Southampton
United Kingdom, Cambridge
University of Cambridge
Homan, Jeroen
United States, Oakland
Eureka Scientific, Inc.
Netherlands, Utrecht
Sron Netherlands Institute for Space Research
Lucchini, Matteo
United States, Cambridge
Massachusetts Institute of Technology
Netherlands, Amsterdam
Universiteit Van Amsterdam
Fabian, Andrew C.
United Kingdom, Cambridge
University of Cambridge
Bright, Joe S.
United Kingdom, Oxford
University of Oxford
Fender, Robert P.
United Kingdom, Oxford
University of Oxford
Cackett, Edward M.
United States, Detroit
Wayne State University
Remillard, Ronald A.
United States, Cambridge
Massachusetts Institute of Technology
Statistics
Citations: 44
Authors: 15
Affiliations: 11
Identifiers
Doi:
10.3847/2041-8213/abec79
ISSN:
20418205