A long-lived compact jet in the black hole X-ray binary candidate AT2019wey
Artikel i vetenskaplig tidskrift, 2022
AT2019wey is a transient discovered by the Asteroid Terrestrial-impact Last Alert System survey in December of 2019. Follow-up optical, radio, and X-ray observations led to classification of this source as a Galactic black hole X-ray binary candidate. We carried out one-epoch 6.7 GHz European Very Long Baseline Interferometry Network and two-epoch multi-frequency (1.6, 4.5, 6.7 GHz) Very Long Baseline Array observations within a year after its discovery. These observations reveal a fading and flat-spectrum radio source with no discernible motion. These features suggest the detection of a compact jet. The source appears resolved at milliarcsecond scales, and the source angular size versus frequency trend is consistent with scatter broadening. This allows us to constrain the lower limit of the source distance to 6 kpc if the scattering medium is in a Galactic spiral arm. For a source location at greater than 3 kpc, the estimated upper limit of the peculiar velocity suggests the asymmetric natal kick may have occurred during the black hole formation stage.
ISM: jets and outflows
X-rays: binaries
Stars: individual: AT2019wey
Författare
Hong Min Cao
Shangqiu Normal University
Giulia Migliori
Istituto di Radioastronomia
M. Giroletti
Istituto di Radioastronomia
Sándor Frey
Eötvös Loránd University (ELTE)
Magyar Tudomanyos Akademia
Jun Yang
Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium
Krisztina E. Gabányi
Magyar Tudomanyos Akademia
Eötvös Loránd University (ELTE)
Lang Cui
Chinese Academy of Sciences
T. An
Chinese Academy of Sciences
X. Y. Hong
Chinese Academy of Sciences
Wen Da Zhang
Chinese Academy of Sciences
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 657 A104Ämneskategorier (SSIF 2011)
Meteorologi och atmosfärforskning
Astronomi, astrofysik och kosmologi
Geofysik
DOI
10.1051/0004-6361/202142241