Modelling the broad-band spectra of X-ray emitting GPS galaxies

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dc.creatorOstorero, L.
dc.creatorModerski, R.
dc.creatorStawarz, L.
dc.creatorBegelman, M. C.
dc.creatorDiaferio, A.
dc.creatorKowalska, I.
dc.creatorKataoka, J.
dc.creatorWagner, S. J.
dc.date2008-11-18
dc.date.accessioned2026-07-07T12:39:15Z
dc.date.available2026-07-07T12:39:15Z
dc.descriptionThe study of the broad-band emission of GHz-Peaked-Spectrum (GPS) radio galaxies is a powerful tool to investigate the physical processes taking place in the central, kpc-sized region of their active hosts, where the jets propagate and the lobes expand, interacting with the surrounding interstellar medium (ISM). We recently developed a new dynamical-radiative model to describe the evolution of the GPS phenomenon (Stawarz et al. 2008): as the relativistic jets propagate through the ISM, gradually engulfing narrow-line emitting gas clouds along their way, the electron population of the expanding lobes evolves, emitting synchrotron light, as well as inverse-Compton radiation via up-scattering of the photon fields from the host galaxy and its active nucleus. The model, which successfully reproduces the key features of the GPS radio sources as a class, provides a description of the evolution of their spectral energy distribution (SED) with the lobes' expansion, predicting significant and complex X-ray to gamma-ray emission. We apply here the model to the broad-band SED's of a sample of known, X-ray emitting GPS galaxies, and show that: (i) the free-free absorption mechanism enables us to reproduce the radio continuum at frequencies below the turnover; (ii) the lobes' non-thermal, inverse-Compton emission can account for the observed X-ray spectra, providing a viable alternative to the thermal, accretion-dominated scenario. We also show that, in our sample, the relationship between the X-ray and radio hydrogen column densitities, N_H and N_HI, is suggestive of a positive correlation, which, if confirmed, would support the scenario of high-energy emitting lobes.
dc.description4 pages, 2 figures, accepted for publication in Astronomische Nachrichten (issue dedicated to the Proceedings of "The Fourth Workshop on Compact Steep Spectrum and GHz-Peaked Spectrum Radio Sources")
dc.identifierhttps://arxiv.org/abs/0811.2964
dc.identifierhttp://arxiv.org/abs/0811.2964
dc.identifierAstronomische Nachrichten 330 (2009) 275-278
dc.identifierdoi:10.1002/asna.200811174
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/219040
dc.subjectAstrophysics
dc.titleModelling the broad-band spectra of X-ray emitting GPS galaxies
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