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|a Homan, Jeroen
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Motta, Sara E.
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|a Bright, Joe
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|a Altamirano, Diego
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|a Arzoumanian, Zaven
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|a Basak, Arkadip
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|a Belloni, Tomaso M.
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|a Cackett, Edward M.
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|a Fender, Rob
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|a Gendreau, Keith C.
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|a Kara, Erin A
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|a Pasham, Dheeraj Ranga Reddy
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|a Remillard, Ronald A
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|a Steiner, James F.
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|a Stevens, Abigail L.
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|a Uttley, Phil
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|a A Rapid Change in X-Ray Variability and a Jet Ejection in the Black Hole Transient MAXI J1820+070
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|b American Astronomical Society,
|c 2021-01-27T20:26:47Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/129585
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|a 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.
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|a Article
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|t Astrophysical Journal Letters
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