Swift J1727.8–1613 Has the Largest Resolved Continuous Jet Ever Seen in an X-Ray Binary

Wood, CM; Miller-Jones, JCA; Bahramian, A; Tingay, SJ; Prabu, S; Russell, TD; Atri, P; Carotenuto, F; Altamirano, D; Motta, SE; Hyland, L; Reynolds, C; Weston, S; Fender, R; Körding, E; Maitra, D; Markoff, S; Migliari, S; Russell, DM; Sarazin, CL; Sivakoff, GR; Soria, R; Tetarenko, AJ; Tudose, V

Journal article

Swift J1727.8–1613 Has the Largest Resolved Continuous Jet Ever Seen in an X-Ray Binary

Abstract:: Multiwavelength polarimetry and radio observations of Swift J1727.8–1613 at the beginning of its recent 2023 outburst suggested the presence of a bright compact jet aligned in the north–south direction, which could not be confirmed without high-angular-resolution images. Using the Very Long Baseline Array and the Long Baseline Array, we imaged Swift J1727.8–1613 during the hard/hard-intermediate state, revealing a bright core and a large, two-sided, asymmetrical, resolved jet. The jet extends in the north–south direction, at a position angle of −0.60° ± 0.07° east of north. At 8.4 GHz, the entire resolved jet structure is ∼110(d/2.7kpc)/sini au long, with the southern approaching jet extending ∼80(d/2.7kpc)/sini au from the core, where d is the distance to the source and i is the inclination of the jet axis to the line of sight. These images reveal the most resolved continuous X-ray binary jet, and possibly the most physically extended continuous X-ray binary jet ever observed. Based on the brightness ratio of the approaching and receding jets, we put a lower limit on the intrinsic jet speed of β ≥ 0.27 and an upper limit on the jet inclination of i ≤ 74°. In our first observation we also detected a rapidly fading discrete jet knot 66.89 ± 0.04 mas south of the core, with a proper motion of 0.66 ± 0.05 mas hr−1, which we interpret as the result of a downstream internal shock or a jet–interstellar medium interaction, as opposed to a transient relativistic jet launched at the beginning of the outburst.

Publication status:: Published

Peer review status:: Peer reviewed

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APA Style

Wood, C. M., Miller-Jones, J. C. A., Bahramian, A., Tingay, S. J., Prabu, S., Russell, T. D., Atri, P., Carotenuto, F., Altamirano, D., Motta, S. E., Hyland, L., Reynolds, C., Weston, S., Fender, R., Körding, E., Maitra, D., Markoff, S., Migliari, S., Russell, D. M., … Tudose, V. (2024). Swift J1727.8–1613 Has the Largest Resolved Continuous Jet Ever Seen in an X-Ray Binary. The Astrophysical Journal Letters, 971(1).

MLA Style

Wood, C. M., et al. “Swift J1727.8–1613 Has the Largest Resolved Continuous Jet Ever Seen in an X-Ray Binary.” The Astrophysical Journal Letters, vol. 971, no. 1, American Astronomical Society, 2024.

Chicago Style

Wood, CM, JCA Miller-Jones, A Bahramian, SJ Tingay, S Prabu, TD Russell, P Atri, et al. 2024. “Swift J1727.8–1613 Has the Largest Resolved Continuous Jet Ever Seen in an X-Ray Binary.” The Astrophysical Journal Letters 971 (1).
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