X-ray-emitting GHz-peaked-spectrum galaxies: Testing a dynamical-radiative model with broadband spectra

L. Ostorero, R. Moderski, Stawarz, A. Diaferio, I. Kowalska, C. C. Cheung, Jun Kataoka, M. C. Begelman, S. J. Wagner

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    In a dynamical-radiative model we recently developed to describe the physics of compact, GHz-peaked-spectrum (GPS) sources, the relativistic jets propagate across the inner, kpc-sized region of the host galaxy, while the electron population of the expanding lobes evolves and emits synchrotron and inverse-Compton (IC) radiation. Interstellar-medium gas clouds engulfed by the expanding lobes, and photoionized by the active nucleus, are responsible for the radio spectral turnover through free-free absorption (FFA) of the synchrotron photons. The model provides a description of the evolution of the spectral energy distribution (SED) of GPS sources with their expansion, predicting significant and complex high-energy emission, from the X-ray to the γ-ray frequency domain. Here, we test this model with the broadband SEDs of a sample of 11 X-ray-emitting GPS galaxies with compact-symmetric-object morphology, and show that (1) the shape of the radio continuum at frequencies lower than the spectral turnover is indeed well accounted for by the FFA mechanism and (2) the observed X-ray spectra can be interpreted as non-thermal radiation produced via IC scattering of the local radiation fields off the lobe particles, providing a viable alternative to the thermal, accretion-disk-dominated scenario. We also show that the relation between the hydrogen column densities derived from the X-ray (N H) and radio (N HI) data of the sources is suggestive of a positive correlation, which, if confirmed by future observations, would provide further support to our scenario of high-energy emitting lobes.

    Original languageEnglish
    Pages (from-to)1071-1093
    Number of pages23
    JournalAstrophysical Journal
    Volume715
    Issue number2
    DOIs
    Publication statusPublished - 2010

    Fingerprint

    lobes
    galaxies
    broadband
    radio
    turnover
    synchrotrons
    x rays
    energy
    nonthermal radiation
    spectral energy distribution
    accretion disks
    radiation distribution
    rays
    physics
    accretion
    scattering
    hydrogen
    continuums
    low frequencies
    electron

    Keywords

    • Galaxies: active
    • Galaxies: jets

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Ostorero, L., Moderski, R., Stawarz, Diaferio, A., Kowalska, I., Cheung, C. C., ... Wagner, S. J. (2010). X-ray-emitting GHz-peaked-spectrum galaxies: Testing a dynamical-radiative model with broadband spectra. Astrophysical Journal, 715(2), 1071-1093. https://doi.org/10.1088/0004-637X/715/2/1071

    X-ray-emitting GHz-peaked-spectrum galaxies : Testing a dynamical-radiative model with broadband spectra. / Ostorero, L.; Moderski, R.; Stawarz; Diaferio, A.; Kowalska, I.; Cheung, C. C.; Kataoka, Jun; Begelman, M. C.; Wagner, S. J.

    In: Astrophysical Journal, Vol. 715, No. 2, 2010, p. 1071-1093.

    Research output: Contribution to journalArticle

    Ostorero, L, Moderski, R, Stawarz, Diaferio, A, Kowalska, I, Cheung, CC, Kataoka, J, Begelman, MC & Wagner, SJ 2010, 'X-ray-emitting GHz-peaked-spectrum galaxies: Testing a dynamical-radiative model with broadband spectra', Astrophysical Journal, vol. 715, no. 2, pp. 1071-1093. https://doi.org/10.1088/0004-637X/715/2/1071
    Ostorero, L. ; Moderski, R. ; Stawarz ; Diaferio, A. ; Kowalska, I. ; Cheung, C. C. ; Kataoka, Jun ; Begelman, M. C. ; Wagner, S. J. / X-ray-emitting GHz-peaked-spectrum galaxies : Testing a dynamical-radiative model with broadband spectra. In: Astrophysical Journal. 2010 ; Vol. 715, No. 2. pp. 1071-1093.
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