Hubble space telescope observations of the luminous iras source FSC 10214+4724: A gravitationally lensed infrared quasar

Peter R. Eisenhardt, Lee Armus, David W. Hogg, B. T. Soifer, G. Neugebauer, Michael W. Werner

    Research output: Contribution to journalArticle

    Abstract

    With a redshift of 2.3, the IRAS source FSC 10214+4724 is-apparently one of the most luminous objects known in the universe. We present an image of FSC 10214+4724 at 0.8 μm obtained with the Hubble Space Telescope (HST) WFPC2 Planetary Camera. The source appears as an unresolved (<0″06) arc 0″7 long, with significant substructure along its length. The center of curvature of the arc is located near an elliptical galaxy 1″18 to the north. An unresolved component 100 times fainter than the arc is clearly detected on the opposite side of this galaxy. The most straightforward interpretation is that FSC 10214+4724 is gravitationally lensed by the foreground elliptical galaxy, with the faint component a counterimage of the IRAS source. The brightness of the arc in the HST image is then magnified by ∼100, and the intrinsic source diameter is ∼ 0″01 (80 pc) at 0.25 μm rest wavelength. The bolometric luminosity is probably amplified by a smaller factor (∼30) as a result of the larger extent expected for the source in the far-infrared. A detailed lensing model is presented that reproduces the observed mor-phology and relative flux of the arc and counterimage and correctly predicts the position angle of the lensing galaxy. The model also predicts reasonable values for the velocity dispersion, mass, and mass-to-light ratio of the lensing galaxy for a wide range of galaxy redshifts. A redshift for the lensing galaxy of ∼0.9 is consistent with the measured surface brightness profile from the image, as well as with the galaxy's spectral energy distribution. The background lensed source has an intrinsic luminosity ∼2 × 1013 L and remains a highly luminous quasar with an extremely large ratio of infrared to optical/ultraviolet luminosity.

    Original languageEnglish (US)
    Pages (from-to)72-83
    Number of pages12
    JournalAstrophysical Journal
    Volume461
    Issue number1 PART I
    StatePublished - 1996

    Fingerprint

    Hubble Space Telescope
    quasars
    galaxies
    arcs
    luminosity
    elliptical galaxies
    Infrared Astronomy Satellite
    curvature
    brightness
    wavelength
    mass to light ratios
    spectral energy distribution
    substructures
    energy
    universe
    cameras
    profiles
    wavelengths

    Keywords

    • Gravitational lensing
    • Infrared: galaxies

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Eisenhardt, P. R., Armus, L., Hogg, D. W., Soifer, B. T., Neugebauer, G., & Werner, M. W. (1996). Hubble space telescope observations of the luminous iras source FSC 10214+4724: A gravitationally lensed infrared quasar. Astrophysical Journal, 461(1 PART I), 72-83.

    Hubble space telescope observations of the luminous iras source FSC 10214+4724 : A gravitationally lensed infrared quasar. / Eisenhardt, Peter R.; Armus, Lee; Hogg, David W.; Soifer, B. T.; Neugebauer, G.; Werner, Michael W.

    In: Astrophysical Journal, Vol. 461, No. 1 PART I, 1996, p. 72-83.

    Research output: Contribution to journalArticle

    Eisenhardt, PR, Armus, L, Hogg, DW, Soifer, BT, Neugebauer, G & Werner, MW 1996, 'Hubble space telescope observations of the luminous iras source FSC 10214+4724: A gravitationally lensed infrared quasar', Astrophysical Journal, vol. 461, no. 1 PART I, pp. 72-83.
    Eisenhardt PR, Armus L, Hogg DW, Soifer BT, Neugebauer G, Werner MW. Hubble space telescope observations of the luminous iras source FSC 10214+4724: A gravitationally lensed infrared quasar. Astrophysical Journal. 1996;461(1 PART I):72-83.
    Eisenhardt, Peter R. ; Armus, Lee ; Hogg, David W. ; Soifer, B. T. ; Neugebauer, G. ; Werner, Michael W. / Hubble space telescope observations of the luminous iras source FSC 10214+4724 : A gravitationally lensed infrared quasar. In: Astrophysical Journal. 1996 ; Vol. 461, No. 1 PART I. pp. 72-83.
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    abstract = "With a redshift of 2.3, the IRAS source FSC 10214+4724 is-apparently one of the most luminous objects known in the universe. We present an image of FSC 10214+4724 at 0.8 μm obtained with the Hubble Space Telescope (HST) WFPC2 Planetary Camera. The source appears as an unresolved (<0″06) arc 0″7 long, with significant substructure along its length. The center of curvature of the arc is located near an elliptical galaxy 1″18 to the north. An unresolved component 100 times fainter than the arc is clearly detected on the opposite side of this galaxy. The most straightforward interpretation is that FSC 10214+4724 is gravitationally lensed by the foreground elliptical galaxy, with the faint component a counterimage of the IRAS source. The brightness of the arc in the HST image is then magnified by ∼100, and the intrinsic source diameter is ∼ 0″01 (80 pc) at 0.25 μm rest wavelength. The bolometric luminosity is probably amplified by a smaller factor (∼30) as a result of the larger extent expected for the source in the far-infrared. A detailed lensing model is presented that reproduces the observed mor-phology and relative flux of the arc and counterimage and correctly predicts the position angle of the lensing galaxy. The model also predicts reasonable values for the velocity dispersion, mass, and mass-to-light ratio of the lensing galaxy for a wide range of galaxy redshifts. A redshift for the lensing galaxy of ∼0.9 is consistent with the measured surface brightness profile from the image, as well as with the galaxy's spectral energy distribution. The background lensed source has an intrinsic luminosity ∼2 × 1013 L⊙ and remains a highly luminous quasar with an extremely large ratio of infrared to optical/ultraviolet luminosity.",
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