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arxiv: 2003.01012 · v1 · pith:KJR5HXXG · submitted 2020-03-02 · astro-ph.HE

A rapid change in X-ray variability and a jet ejection in the black hole transient MAXI J1820+070

Jeroen Homan , Joe Bright , Sara E. Motta , Diego Altamirano , Zaven Arzoumanian , Arkadip Basak , Tomaso M. Belloni , Edward M. Cackett
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Rob Fender Keith C. Gendreau Erin Kara Dheeraj R. Pasham Ronald A. Remillard James F. Steiner Abigail L. Stevens Phil Uttley
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classification astro-ph.HE
keywords x-rayblackholeradiostateflarej1820launch
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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 (~1.5-2.5 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.

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