Evolution of the radio-x-ray coupling throughout an entire outburst of Aquila X-1

J. C.A. Miller-Jones, G. R. Sivakoff, D. Altamirano, V. Tudose, S. Migliari, V. Dhawan, R. P. Fender, M. A. Garrett, S. Heinz, E. G. Körding, H. A. Krimm, M. Linares, D. Maitra, S. Markoff, Z. Paragi, R. A. Remillard, M. P. Rupen, A. Rushton, Dave Russell, C. L. Sarazin & 1 others R. E. Spencer

Research output: Contribution to journalArticle

Abstract

The 2009 November outburst of the neutron star X-ray binary Aquila X-1 (Aql X-1) was observed with unprecedented radio coverage and simultaneous pointed X-ray observations, tracing the radio emission around the full X-ray hysteresis loop of the outburst for the first time. We use these data to discuss the disk-jet coupling, finding the radio emission to be consistent with being triggered at state transitions, both from the hard to the soft spectral state and vice versa. Our data appear to confirm previous suggestions of radio quenching in the soft state above a threshold X-ray luminosity of ∼10% of the Eddington luminosity. We also present the first detections of Aql X-1 with very long baseline interferometry, showing that any extended emission is relatively diffuse and consistent with steady jets rather than arising from discrete, compact knots. In all cases where multi-frequency data were available, the source radio spectrum is consistent with being flat or slightly inverted, suggesting that the internal shock mechanism that is believed to produce optically thin transient radio ejecta in black hole X-ray binaries is not active in Aql X-1.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume716
Issue number2 PART 2
DOIs
StatePublished - Jan 1 2010

Fingerprint

outburst
radio
radio emission
x rays
luminosity
radio spectra
ejecta
tracing
neutron stars
very long baseline interferometry
suggestion
hysteresis
interferometry
shock
quenching
thresholds

Keywords

  • astrometry
  • radio continuum: stars
  • stars: individual (Aql X-1)
  • X-rays: binaries

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Miller-Jones, J. C. A., Sivakoff, G. R., Altamirano, D., Tudose, V., Migliari, S., Dhawan, V., ... Spencer, R. E. (2010). Evolution of the radio-x-ray coupling throughout an entire outburst of Aquila X-1. Astrophysical Journal Letters, 716(2 PART 2). https://doi.org/10.1088/2041-8205/716/2/L109

Evolution of the radio-x-ray coupling throughout an entire outburst of Aquila X-1. / Miller-Jones, J. C.A.; Sivakoff, G. R.; Altamirano, D.; Tudose, V.; Migliari, S.; Dhawan, V.; Fender, R. P.; Garrett, M. A.; Heinz, S.; Körding, E. G.; Krimm, H. A.; Linares, M.; Maitra, D.; Markoff, S.; Paragi, Z.; Remillard, R. A.; Rupen, M. P.; Rushton, A.; Russell, Dave; Sarazin, C. L.; Spencer, R. E.

In: Astrophysical Journal Letters, Vol. 716, No. 2 PART 2, 01.01.2010.

Research output: Contribution to journalArticle

Miller-Jones, JCA, Sivakoff, GR, Altamirano, D, Tudose, V, Migliari, S, Dhawan, V, Fender, RP, Garrett, MA, Heinz, S, Körding, EG, Krimm, HA, Linares, M, Maitra, D, Markoff, S, Paragi, Z, Remillard, RA, Rupen, MP, Rushton, A, Russell, D, Sarazin, CL & Spencer, RE 2010, 'Evolution of the radio-x-ray coupling throughout an entire outburst of Aquila X-1', Astrophysical Journal Letters, vol. 716, no. 2 PART 2. https://doi.org/10.1088/2041-8205/716/2/L109
Miller-Jones JCA, Sivakoff GR, Altamirano D, Tudose V, Migliari S, Dhawan V et al. Evolution of the radio-x-ray coupling throughout an entire outburst of Aquila X-1. Astrophysical Journal Letters. 2010 Jan 1;716(2 PART 2). https://doi.org/10.1088/2041-8205/716/2/L109
Miller-Jones, J. C.A. ; Sivakoff, G. R. ; Altamirano, D. ; Tudose, V. ; Migliari, S. ; Dhawan, V. ; Fender, R. P. ; Garrett, M. A. ; Heinz, S. ; Körding, E. G. ; Krimm, H. A. ; Linares, M. ; Maitra, D. ; Markoff, S. ; Paragi, Z. ; Remillard, R. A. ; Rupen, M. P. ; Rushton, A. ; Russell, Dave ; Sarazin, C. L. ; Spencer, R. E. / Evolution of the radio-x-ray coupling throughout an entire outburst of Aquila X-1. In: Astrophysical Journal Letters. 2010 ; Vol. 716, No. 2 PART 2.
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