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

Citation

Miller-Jones, JCA and Moin, A and Tingay, SJ and Reynolds, C and Phillips, CJ and Tzioumis, AK and Fender, RP and McCallum, JN and Nicolson, GD and Tudose, V, The first resolved imaging of milliarcsecond-scale jets in Circinus X-1, Monthly Notices of the Royal Astronomical Society: Letters, 419, (1) pp. L49-L53. ISSN 1745-3933 (2012) [Refereed Article]

Copyright Statement

Copyright 2012 The Authors, Royal Astronomical Society

DOI: doi:10.1111/j.1745-3933.2011.01176.x

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:stars: individual: Circinus X-1; ISM: jets and outflows; radio continuum: stars; X-rays: binaries
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:McCallum, JN (Dr Jamie McCallum)
ID Code:80118
Year Published:2012
Web of Science® Times Cited:8
Deposited By:Mathematics and Physics
Deposited On:2012-10-23
Last Modified:2013-05-23
Downloads:0

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