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The first resolved imaging of milliarcsecond-scale jets in Circinus X-1

Version 2 2025-01-15, 01:06
Version 1 2023-05-17, 13:41
journal contribution
posted on 2025-01-15, 01:06 authored by JCA Miller-Jones, A Moin, SJ Tingay, C Reynolds, CJ Phillips, AK Tzioumis, RP Fender, Jamie McCallumJamie McCallum, GD Nicolson, V Tudose
We present the first resolved imaging of the milliarcsecond-scale jets in the neutron star X-ray binary Circinus X-1, made using the Australian Long Baseline Array. The angular extent of the resolved jets is ~20mas, corresponding to a physical scale of ~150au at the assumed distance of 7.8kpc. The jet position angle is relatively consistent with previous arcsecond-scale imaging with the Australia Telescope Compact Array. The radio emission is symmetric about the peak, and is unresolved along the minor axis, constraining the opening angle to be <20°. We observe evidence for outward motion of the components between the two halves of the observation. Constraints on the proper motion of the radio-emitting components suggest that they are only mildly relativistic, although we cannot definitively rule out the presence of the unseen, ultrarelativistic (Γ > 15) flow previously inferred to exist in this system.

History

Publication title

Monthly Notices of the Royal Astronomical Society: Letters

Volume

419

Issue

1

Pagination

L49-L53

ISSN

1745-3933

Department/School

School of Natural Sciences

Publisher

Monthly notices of the Royal Astronomical Society

Publication status

  • Published

Place of publication

On-Line

Rights statement

Copyright 2012 The Authors, Royal Astronomical Society

Socio-economic Objectives

280120 Expanding knowledge in the physical sciences

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