Radio monitoring of the hard state jets in the 2011 outburst of MAXI J1836-194
Date Issued
2015
Author(s)
Russell, T. D.
•
Miller-Jones, J. C. A.
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Curran, P. A.
•
•
Altamirano, D.
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Corbel, S.
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Coriat, M.
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Moin, A.
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Russell, D. M.
•
Sivakoff, G. R.
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Slaven-Blair, T. J.
•
•
Fender, R. P.
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Heinz, S.
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Jonker, P. G.
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Krimm, H. A.
•
Körding, E. G.
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Maitra, D.
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Markoff, S.
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Middleton, M.
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Migliari, S.
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Remillard, R. A.
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Rupen, M. P.
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Sarazin, C. L.
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Tetarenko, A. J.
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Torres, M. A. P.
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Tudose, V.
•
Tzioumis, A. K.
Description
We would like to thank the anonymous referee for their helpful comments and suggestions. We also thank Tom Maccarone for useful discussions. This research was supported under the Australian Research Council's Discovery Projects funding scheme (project number DP 120102393). DA acknowledges support from the Royal Society. SC acknowledges funding support from the French Research National Agency: CHAOS project ANR-12-BS05-0009 ( http://www.chaos-project.fr ) and financial support from the UnivEarthS Labex program of Sorbonne Paris Cité (ANR-10-LABX-0023 and ANR-11-IDEX-0005-02). GRS and AJT are supported by an NSERC Discovery Grant. TMB acknowledges support from INAF-PRIN 2012-6. SM acknowledges support by the Spanish Ministerio de Economía y Competitividad and European Social Funds through a Ramón y Cajal Fellowship and the Spanish Ministerio de Ciencia e Innovación (SM; grant AYA2013-47447-C03-1-P). This research has made use of NASA's Astrophysics Data System. The International Centre for Radio Astronomy Research is a joint venture between Curtin University and the University of Western Australia, funded by the state government of Western Australia and the joint venture partners. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The ATCA is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO.
Abstract
MAXI J1836-194 is a Galactic black hole candidate X-ray binary that was discovered in 2011 when it went into outburst. In this paper, we present the full radio monitoring of this system during its `failed' outburst, in which the source did not complete a full set of state changes, only transitioning as far as the hard intermediate state. Observations with the Karl G. Jansky Very Large Array (VLA) and Australia Telescope Compact Array (ATCA) show that the jet properties changed significantly during the outburst. The VLA observations detected linearly polarized emission at a level of ̃1 per cent early in the outburst, increasing to ̃3 per cent as the outburst peaked. High-resolution images with the Very Long Baseline Array (VLBA) show an ̃15 mas jet along the position angle -21 ± 2°, in agreement with the electric vector position angle found from our polarization results (-21 ± 4°), implying that the magnetic field is perpendicular to the jet. Astrometric observations suggest that the system required an asymmetric natal kick to explain its observed space velocity. Comparing quasi-simultaneous X-ray monitoring with the 5 GHz VLA observations from the 2011 outburst shows an unusually steep hard-state radio/X-ray correlation of L_R ∝ L_X^{1.8± 0.2}, where LR and LX denote the radio and X-ray luminosities, respectively. With ATCA and Swift monitoring of the source during a period of re-brightening in 2012, we show that the system lay on the same steep correlation. Due to the low inclination of this system, we then investigate the possibility that the observed correlation may have been steepened by variable Doppler boosting.
Volume
450
Issue
2
Start page
1745
Issn Identifier
0035-8711
Ads BibCode
2015MNRAS.450.1745R
Rights
open.access
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