Spitzer reveals infrared optically thin synchrotron emission from the compact jet of the neutron star x-ray binary 4U 0614+091

S. Migliari, J. A. Tomsick, T. J. Maccarone, E. Gallo, R. P. Fender, G. Nelemans, Dave Russell

    Research output: Contribution to journalArticle

    Abstract

    Spitzer observations of the neutron star (ultracompact) X-ray binary (XRB) 4U 0614+091 with the Infrared Array Camera reveal emission of nonthermal origin in the range 3.5-8 μm. The mid-infrared spectrum is well fit by a power law with spectral index of α = -0.57 ± 0.04 (where the flux density is Fv ∞ vα). Given the ultracompact nature of the binary system, we exclude the possibility that either the companion star or the accretion disk can be the origin of the observed emission. These observations represent the first spectral evidence for a compact jet in a low-luminosity neutron star XRB and furthermore of the presence, already observed in two black hole (BH) XRBs, of a "break" in the synchrotron spectrum of such compact jets. We can derive a firm upper limit on the break frequency of the spectrum of Vthin = 3.7 × 1013 Hz, which is lower than that observed in BH XRBs by at least a factor of 10. Assuming a high-energy cooling cutoff at ∼1 keV, we estimate a total (integrated up to X-rays) jet power to X-ray bolometric luminosity ratio of ∼5%, much lower than that inferred in BHs.

    Original languageEnglish (US)
    JournalAstrophysical Journal
    Volume643
    Issue number1 II
    DOIs
    StatePublished - May 29 2006

    Fingerprint

    x ray binaries
    neutron stars
    synchrotrons
    x rays
    luminosity
    companion stars
    accretion disks
    power law
    infrared spectra
    cut-off
    flux density
    cameras
    accretion
    cooling
    estimates
    energy

    Keywords

    • Infrared: general
    • ISM: jets and outflows
    • Radiation mechanisms: nonthermal
    • X-rays: binaries

    ASJC Scopus subject areas

    • Astronomy and Astrophysics
    • Space and Planetary Science

    Cite this

    Migliari, S., Tomsick, J. A., Maccarone, T. J., Gallo, E., Fender, R. P., Nelemans, G., & Russell, D. (2006). Spitzer reveals infrared optically thin synchrotron emission from the compact jet of the neutron star x-ray binary 4U 0614+091. Astrophysical Journal, 643(1 II). https://doi.org/10.1086/505028

    Spitzer reveals infrared optically thin synchrotron emission from the compact jet of the neutron star x-ray binary 4U 0614+091. / Migliari, S.; Tomsick, J. A.; Maccarone, T. J.; Gallo, E.; Fender, R. P.; Nelemans, G.; Russell, Dave.

    In: Astrophysical Journal, Vol. 643, No. 1 II, 29.05.2006.

    Research output: Contribution to journalArticle

    Migliari, S, Tomsick, JA, Maccarone, TJ, Gallo, E, Fender, RP, Nelemans, G & Russell, D 2006, 'Spitzer reveals infrared optically thin synchrotron emission from the compact jet of the neutron star x-ray binary 4U 0614+091', Astrophysical Journal, vol. 643, no. 1 II. https://doi.org/10.1086/505028
    Migliari, S. ; Tomsick, J. A. ; Maccarone, T. J. ; Gallo, E. ; Fender, R. P. ; Nelemans, G. ; Russell, Dave. / Spitzer reveals infrared optically thin synchrotron emission from the compact jet of the neutron star x-ray binary 4U 0614+091. In: Astrophysical Journal. 2006 ; Vol. 643, No. 1 II.
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