A Rapid Change in X-Ray Variability and a Jet Ejection in the Black Hole Transient MAXI J1820+070
Date Issued
2020
Author(s)
Homan, Jeroen
•
Bright, Joe
•
•
Altamirano, Diego
•
Arzoumanian, Zaven
•
Basak, Arkadip
•
•
Cackett, Edward M.
•
Fender, Rob
•
Gendreau, Keith C.
•
Kara, Erin
•
Pasham, Dheeraj R.
•
Remillard, Ronald A.
•
Steiner, James F.
•
Stevens, Abigail L.
•
Uttley, Phil
Abstract
We present Neutron Star Interior Composition Explorer X-ray and Arcminute Microkelvin Imager Large Array radio observations of a rapid hard-to-soft state transition in the black hole X-ray transient MAXI J1820+070. During the transition from the hard state to the soft state a switch between two particular types of quasiperiodic oscillations (QPOs) was seen in the X-ray power density spectra, from type-C to type-B, along with a drop in the strength of the broadband X-ray variability and a brief flare in the 7-12 keV band. Soon after this switch (∼2-2.5 hr) a strong radio flare was observed that corresponded to the launch of superluminal ejecta. Although hints of a connection between QPO transitions and radio flares have been seen in other black hole X-ray transients, our observations constitute the strongest observational evidence to date for a link between the appearance of type-B QPOs and the launch of discrete jet ejections.
Volume
891
Issue
2
Start page
L29
Issn Identifier
2041-8205
Rights
open.access
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