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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