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The first resolved imaging of milliarcsecond-scale jets in Circinus X-1
journal contribution
posted on 2023-05-17, 13:41 authored by Miller-Jones, JCA, Moin, A, Tingay, SJ, Reynolds, C, Phillips, CJ, Tzioumis, AK, Fender, RP, Jamie McCallumJamie McCallum, Nicolson, GD, Tudose, VWe 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: LettersVolume
419Pagination
L49-L53ISSN
1745-3933Department/School
School of Natural SciencesPublisher
Monthly notices of the Royal Astronomical SocietyPlace of publication
On-LineRights statement
Copyright 2012 The Authors, Royal Astronomical SocietyRepository Status
- Restricted