Radio monitoring of the hard state jets in the 2011 outburst of MAXI J1836-194

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DOIResolve DOI: http://doi.org/10.1093/mnras/stv723
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TypeArticle
Journal titleMonthly Notices of the Royal Astronomical Society
ISSN0035-8711
1365-2966
Volume450
Issue2
Pages17451759
Subjectproper motions; stars: individual: MAXI J1836−194; ISM: jets and outflows; radio continuum: stars; X-rays: binaries
AbstractMAXI 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 polarised emission at a level of ~1% early in the outburst, increasing to ~3% as the outburst peaked. High-resolution images with the Very Long Baseline Array (VLBA) show a ~15 mas jet along the position angle -21 ± 2o, in agreement with the electric vector position angle found from our polarisation results (-21 ± 4o), 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 LR ∝ LX1.8±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.
Publication date
PublisherOxford University Press
LanguageEnglish
AffiliationNRC Herzberg Astronomy and Astrophysics; National Research Council Canada
Peer reviewedYes
NPARC number23001592
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Record identifier30af72f7-e856-48c5-b50b-39225410c540
Record created2017-03-09
Record modified2017-03-30
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