The evolving polarized jet of black hole candidate swift J1745-26

P. A. Curran, M. Coriat, J. C.A. Miller-Jones, R. P. Armstrong, P. G. Edwards, G. R. Sivakoff, P. Woudt, D. Altamirano, T. M. Belloni, S. Corbel, R. P. Fender, E. G. K̈ording, H. A. Krimm, S. Markoff, S. Migliari, Dave Russell, J. Stevens, T. Tzioumis

Research output: Contribution to journalArticle

Abstract

Swift J1745-26 is an X-ray binary towards the Galactic Centre that was detected when it went into outburst in 2012 September. This source is thought to be one of a growing number of sources that display 'failed outbursts', in which the self-absorbed radio jets of the transient source are never fully quenched and the thermal emission from the geometrically thin inner accretion disc never fully dominates the X-ray flux. We present multifrequency data from the Very Large Array, Australia Telescope Compact Array and Karoo Array Telescope (KAT- 7) radio arrays, spanning the entire period of the outburst. Our rich data set exposes radio emission that displays a high level of large-scale variability compared to the X-ray emission and deviations from the standard radio-X-ray correlation that are indicative of an unstable jet and confirm the outburst's transition from the canonical hard state to an intermediate state. We also observe steepening of the spectral index and an increase of the linear polarization to a large fraction (50 per cent) of the total flux, as well as a rotation of the electric vector position angle. These are consistent with a transformation from a self-absorbed compact jet to optically thin ejecta - the first time such a discrete ejection has been observed in a failed outburst - and may imply a complex magnetic field geometry.

Original languageEnglish (US)
Pages (from-to)3265-3273
Number of pages9
JournalMonthly Notices of the Royal Astronomical Society
Volume437
Issue number4
DOIs
StatePublished - Feb 1 2014

Fingerprint

outburst
radio
x rays
telescopes
Very Large Array (VLA)
thermal emission
ejecta
radio emission
linear polarization
ejection
accretion disks
deviation
polarization
accretion
magnetic field
geometry
magnetic fields

Keywords

  • Binaries
  • Binaries - X-rays
  • Bursts
  • Close - stars
  • Individual
  • Swift J1745-26 - stars
  • Swift J174510.8-262411 -X-rays

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Curran, P. A., Coriat, M., Miller-Jones, J. C. A., Armstrong, R. P., Edwards, P. G., Sivakoff, G. R., ... Tzioumis, T. (2014). The evolving polarized jet of black hole candidate swift J1745-26. Monthly Notices of the Royal Astronomical Society, 437(4), 3265-3273. https://doi.org/10.1093/mnras/stt2125

The evolving polarized jet of black hole candidate swift J1745-26. / Curran, P. A.; Coriat, M.; Miller-Jones, J. C.A.; Armstrong, R. P.; Edwards, P. G.; Sivakoff, G. R.; Woudt, P.; Altamirano, D.; Belloni, T. M.; Corbel, S.; Fender, R. P.; K̈ording, E. G.; Krimm, H. A.; Markoff, S.; Migliari, S.; Russell, Dave; Stevens, J.; Tzioumis, T.

In: Monthly Notices of the Royal Astronomical Society, Vol. 437, No. 4, 01.02.2014, p. 3265-3273.

Research output: Contribution to journalArticle

Curran, PA, Coriat, M, Miller-Jones, JCA, Armstrong, RP, Edwards, PG, Sivakoff, GR, Woudt, P, Altamirano, D, Belloni, TM, Corbel, S, Fender, RP, K̈ording, EG, Krimm, HA, Markoff, S, Migliari, S, Russell, D, Stevens, J & Tzioumis, T 2014, 'The evolving polarized jet of black hole candidate swift J1745-26', Monthly Notices of the Royal Astronomical Society, vol. 437, no. 4, pp. 3265-3273. https://doi.org/10.1093/mnras/stt2125
Curran PA, Coriat M, Miller-Jones JCA, Armstrong RP, Edwards PG, Sivakoff GR et al. The evolving polarized jet of black hole candidate swift J1745-26. Monthly Notices of the Royal Astronomical Society. 2014 Feb 1;437(4):3265-3273. https://doi.org/10.1093/mnras/stt2125
Curran, P. A. ; Coriat, M. ; Miller-Jones, J. C.A. ; Armstrong, R. P. ; Edwards, P. G. ; Sivakoff, G. R. ; Woudt, P. ; Altamirano, D. ; Belloni, T. M. ; Corbel, S. ; Fender, R. P. ; K̈ording, E. G. ; Krimm, H. A. ; Markoff, S. ; Migliari, S. ; Russell, Dave ; Stevens, J. ; Tzioumis, T. / The evolving polarized jet of black hole candidate swift J1745-26. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 437, No. 4. pp. 3265-3273.
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