VLBA discovery of a resolved source in the candidate black hole X-ray binary AT2019wey

Abstract

AT2019wey is a Galactic low mass X-ray binary with a candidate black hole accretor first discovered as an optical transient by ATLAS in December 2019. It was then associated with an X-ray source discovered by SRG in March 2020. After observing a brightening in X-rays in August 2020, VLA observations of the source revealed an optically thin spectrum that subsequently shifted to optically thick, as the source continued to brighten in radio. This motivated observations of the source with the VLBA. We found a resolved source that we interpret to be a steady compact jet, a feature associated with black hole X-ray binary systems in the hard X-ray spectral state. The jet power is comparable to the accretion-disk X-ray luminosity. Here, we summarize the results from these observations.

arXiv comment7 pages, 5 figures, accepted to ApJL

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Cited by in corpus (7)

• The NICER "Reverberation Machine": A Systematic Study of Time Lags in Black Hole X-Ray Binaries
• Multi-wavelength Observations of AT2019wey: a New Candidate Black Hole Low-mass X-ray Binary
• A Comprehensive X-ray Report on AT2019wey
• The Weizmann Fast Astronomical Survey Telescope (W-FAST): System Overview
• A long-lived compact jet in the black hole X-ray binary candidate AT2019wey
• Spectral Analysis of New Black Hole Candidate AT2019wey Observed by NuSTAR
• Proper Motion and Natal Kick in the Galactic Black Hole X-ray Binary AT2019wey