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VLBA Discovery of a Resolved Source in the Candidate Black Hole X-Ray Binary AT2019wey

Yadlapalli, Nitika and Ravi, Vikram and Yao, Yuhan and Kulkarni, S. R. and Brisken, Walter (2021) VLBA Discovery of a Resolved Source in the Candidate Black Hole X-Ray Binary AT2019wey. Astrophysical Journal Letters, 909 (2). Art. No. L27. ISSN 2041-8213. doi:10.3847/2041-8213/abea19. https://resolver.caltech.edu/CaltechAUTHORS:20210202-095234473

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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 2019 December. It was then associated with an X-ray source discovered by SRG/eROSITA and SRG/ART-XC instruments in 2020 March. After a brightening in X-rays in 2020 August, VLA observations of the source revealed an optically thin spectrum that subsequently shifted to optically thick, as the source continued to brighten in the radio. This motivated us to observe AT2019wey 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 hard X-ray spectral states. The jet power is comparable to the accretion-disk X-ray luminosity. Here, we summarize the results from these observations.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.3847/2041-8213/abea19DOIArticle
https://arxiv.org/abs/2012.13426arXivDiscussion Paper
ORCID:
AuthorORCID
Yadlapalli, Nitika0000-0003-3255-4617
Ravi, Vikram0000-0002-7252-5485
Yao, Yuhan0000-0001-6747-8509
Kulkarni, S. R.0000-0001-5390-8563
Additional Information:© 2021. The American Astronomical Society. Received 2020 December 24; revised 2021 February 25; accepted 2021 February 25; published 2021 March 16. We thank Tim Pearson, Gregg Hallinan, and Katie Bouman for useful discussions on interpreting these results. These observations were conducted with the Very Long Baseline Array. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research has made use of NASA's Astrophysics Data System.
Group:Astronomy Department
Funders:
Funding AgencyGrant Number
NSFUNSPECIFIED
Subject Keywords:Low-mass x-ray binary stars; Black holes; Very long baseline interferometry
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Low-mass x-ray binary stars (939); Black holes (162); Very long baseline interferometry (1769)
DOI:10.3847/2041-8213/abea19
Record Number:CaltechAUTHORS:20210202-095234473
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20210202-095234473
Official Citation:Nitika Yadlapalli et al 2021 ApJL 909 L27
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107857
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:03 Feb 2021 17:48
Last Modified:08 Apr 2021 19:39

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