A tool to separate optical/infrared disc and jet emission in X-ray transient outbursts

The colour-magnitude diagrams of XTE J1550-564

Dave Russell, D. Maitra, R. J.H. Dunn, R. P. Fender

    Research output: Contribution to journalArticle

    Abstract

    It is now established that thermal disc emission and non-thermal jet emission can both play a role at optical/infrared (OIR) wavelengths in X-ray transients. The spectra of the jet and disc components differ, as do their dependence on mass accretion properties. Here we demonstrate that the OIR colour-magnitude diagrams (CMDs) of the evolution of the X-ray transient XTE J1550-564 in outburst can be used to separate the disc from the jet. Monitoring in two wavebands is all that is required. This outburst in 2000 was well studied, and both disc and jet were known to contribute. During the outburst the data follow a well-defined path in the CMD, describing what would be expected from a heated single-temperature blackbody of approximately constant area, except when the data appear redder than this track. This is due to the non-thermal jet component which dominates the OIR moreso during hard X-ray states at high luminosities, and which is quenched in the soft state. The CMD therefore shows state-dependent hysteresis, in analogy with (but not identical to) the well-established X-ray hardness-intensity diagram of black hole transients. The blackbody originates in the X-ray illuminated, likely unwarped, outer accretion disc. We show that the CMD can be approximately reproduced by a model that assumes various correlations between X-ray, OIR disc and OIR jet fluxes. We find evidence for the OIR jet emission to be decoupled from the disc near the peak of the hard state.

    Original languageEnglish (US)
    Pages (from-to)2311-2317
    Number of pages7
    JournalMonthly Notices of the Royal Astronomical Society
    Volume416
    Issue number3
    DOIs
    StatePublished - Sep 1 2011

    Fingerprint

    color-magnitude diagram
    outburst
    diagram
    x rays
    accretion
    hysteresis
    accretion disks
    hardness
    diagrams
    luminosity
    wavelength
    monitoring
    wavelengths

    Keywords

    • Accretion, accretion discs
    • Black hole physics
    • ISM: jets and outflows
    • X-rays: binaries

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    A tool to separate optical/infrared disc and jet emission in X-ray transient outbursts : The colour-magnitude diagrams of XTE J1550-564. / Russell, Dave; Maitra, D.; Dunn, R. J.H.; Fender, R. P.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 416, No. 3, 01.09.2011, p. 2311-2317.

    Research output: Contribution to journalArticle

    @article{d919a23d2b844b1d80a17eb4ddaa64d2,
    title = "A tool to separate optical/infrared disc and jet emission in X-ray transient outbursts: The colour-magnitude diagrams of XTE J1550-564",
    abstract = "It is now established that thermal disc emission and non-thermal jet emission can both play a role at optical/infrared (OIR) wavelengths in X-ray transients. The spectra of the jet and disc components differ, as do their dependence on mass accretion properties. Here we demonstrate that the OIR colour-magnitude diagrams (CMDs) of the evolution of the X-ray transient XTE J1550-564 in outburst can be used to separate the disc from the jet. Monitoring in two wavebands is all that is required. This outburst in 2000 was well studied, and both disc and jet were known to contribute. During the outburst the data follow a well-defined path in the CMD, describing what would be expected from a heated single-temperature blackbody of approximately constant area, except when the data appear redder than this track. This is due to the non-thermal jet component which dominates the OIR moreso during hard X-ray states at high luminosities, and which is quenched in the soft state. The CMD therefore shows state-dependent hysteresis, in analogy with (but not identical to) the well-established X-ray hardness-intensity diagram of black hole transients. The blackbody originates in the X-ray illuminated, likely unwarped, outer accretion disc. We show that the CMD can be approximately reproduced by a model that assumes various correlations between X-ray, OIR disc and OIR jet fluxes. We find evidence for the OIR jet emission to be decoupled from the disc near the peak of the hard state.",
    keywords = "Accretion, accretion discs, Black hole physics, ISM: jets and outflows, X-rays: binaries",
    author = "Dave Russell and D. Maitra and Dunn, {R. J.H.} and Fender, {R. P.}",
    year = "2011",
    month = "9",
    day = "1",
    doi = "10.1111/j.1365-2966.2011.19204.x",
    language = "English (US)",
    volume = "416",
    pages = "2311--2317",
    journal = "Monthly Notices of the Royal Astronomical Society",
    issn = "0035-8711",
    publisher = "Oxford University Press",
    number = "3",

    }

    TY - JOUR

    T1 - A tool to separate optical/infrared disc and jet emission in X-ray transient outbursts

    T2 - The colour-magnitude diagrams of XTE J1550-564

    AU - Russell, Dave

    AU - Maitra, D.

    AU - Dunn, R. J.H.

    AU - Fender, R. P.

    PY - 2011/9/1

    Y1 - 2011/9/1

    N2 - It is now established that thermal disc emission and non-thermal jet emission can both play a role at optical/infrared (OIR) wavelengths in X-ray transients. The spectra of the jet and disc components differ, as do their dependence on mass accretion properties. Here we demonstrate that the OIR colour-magnitude diagrams (CMDs) of the evolution of the X-ray transient XTE J1550-564 in outburst can be used to separate the disc from the jet. Monitoring in two wavebands is all that is required. This outburst in 2000 was well studied, and both disc and jet were known to contribute. During the outburst the data follow a well-defined path in the CMD, describing what would be expected from a heated single-temperature blackbody of approximately constant area, except when the data appear redder than this track. This is due to the non-thermal jet component which dominates the OIR moreso during hard X-ray states at high luminosities, and which is quenched in the soft state. The CMD therefore shows state-dependent hysteresis, in analogy with (but not identical to) the well-established X-ray hardness-intensity diagram of black hole transients. The blackbody originates in the X-ray illuminated, likely unwarped, outer accretion disc. We show that the CMD can be approximately reproduced by a model that assumes various correlations between X-ray, OIR disc and OIR jet fluxes. We find evidence for the OIR jet emission to be decoupled from the disc near the peak of the hard state.

    AB - It is now established that thermal disc emission and non-thermal jet emission can both play a role at optical/infrared (OIR) wavelengths in X-ray transients. The spectra of the jet and disc components differ, as do their dependence on mass accretion properties. Here we demonstrate that the OIR colour-magnitude diagrams (CMDs) of the evolution of the X-ray transient XTE J1550-564 in outburst can be used to separate the disc from the jet. Monitoring in two wavebands is all that is required. This outburst in 2000 was well studied, and both disc and jet were known to contribute. During the outburst the data follow a well-defined path in the CMD, describing what would be expected from a heated single-temperature blackbody of approximately constant area, except when the data appear redder than this track. This is due to the non-thermal jet component which dominates the OIR moreso during hard X-ray states at high luminosities, and which is quenched in the soft state. The CMD therefore shows state-dependent hysteresis, in analogy with (but not identical to) the well-established X-ray hardness-intensity diagram of black hole transients. The blackbody originates in the X-ray illuminated, likely unwarped, outer accretion disc. We show that the CMD can be approximately reproduced by a model that assumes various correlations between X-ray, OIR disc and OIR jet fluxes. We find evidence for the OIR jet emission to be decoupled from the disc near the peak of the hard state.

    KW - Accretion, accretion discs

    KW - Black hole physics

    KW - ISM: jets and outflows

    KW - X-rays: binaries

    UR - http://www.scopus.com/inward/record.url?scp=80052627194&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=80052627194&partnerID=8YFLogxK

    U2 - 10.1111/j.1365-2966.2011.19204.x

    DO - 10.1111/j.1365-2966.2011.19204.x

    M3 - Article

    VL - 416

    SP - 2311

    EP - 2317

    JO - Monthly Notices of the Royal Astronomical Society

    JF - Monthly Notices of the Royal Astronomical Society

    SN - 0035-8711

    IS - 3

    ER -