Proper Motion and Natal Kick in the Galactic Black Hole X-Ray Binary AT2019wey
Artikel i vetenskaplig tidskrift, 2025

Understanding the formation mechanisms of stellar-mass black hole X-ray binaries (BHXBs) remains a fundamental challenge in astrophysics. The natal kick velocities imparted during black hole (BH) formation provide crucial constraints on these formation channels. In this work, we present a new-epoch very long baseline interferometry (VLBI) observation of the Galactic BHXB AT2019wey carried out in 2023. Combining with archival VLBI data from 2020, we successfully measure the proper motion of AT2019wey over a 3 yr timescale, namely, 0.78 ± 0.12 mas yr−1 in R.A. and −0.42 ± 0.07 mas yr−1 in decl. Employing the measured proper motion, we estimate its peculiar velocity and the potential kick velocity (PKV) through Monte Carlo simulations, incorporating uncertainties of its distance and radial velocity. The estimated PKV distributions and height above the Galactic plane suggest that AT2019wey’s BH likely formed through a supernova explosion rather than direct collapse.

Författare

Lang Cui

Xinjiang Astronomical Observatory

Chinese Academy of Sciences

Pengfei Jiang

Xinjiang Astronomical Observatory

T. An

Chinese Academy of Sciences

Hong Min Cao

Shangqiu Normal University

Ning Chang

Xinjiang Astronomical Observatory

Giulia Migliori

Istituto di Radioastronomia

M. Giroletti

Istituto di Radioastronomia

S. Frey

Eötvös Loránd University (ELTE)

Magyar Tudomanyos Akademia

Research Centre For Astronomy and Earth Sciences

Jun Yang

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium

Krisztina E. Gabányi

Research Centre For Astronomy and Earth Sciences

Eötvös Loránd University (ELTE)

Magyar Tudomanyos Akademia

X. Y. Hong

Chinese Academy of Sciences

Wenda Zhang

Chinese Academy of Sciences

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 983 2 147

Ämneskategorier (SSIF 2025)

Astronomi, astrofysik och kosmologi

DOI

10.3847/1538-4357/adc0f7

Mer information

Senast uppdaterat

2025-05-05