ORIENTI, MonicaMonicaORIENTID'AMMANDO, FILIPPOFILIPPOD'AMMANDOLarsson, J.J.LarssonFinke, J.J.FinkeGIROLETTI, MARCELLOMARCELLOGIROLETTIDallacasa, DanieleDanieleDallacasaIsacsson, T.T.IsacssonStoby Hoglund, J.J.Stoby Hoglund2020-06-122020-06-1220150035-8711http://hdl.handle.net/20.500.12386/26018We report results on multiband observations from radio to γ-rays of the two radio-loud narrow-line Seyfert 1 (NLSy1) galaxies PKS 2004-447 and J1548+3511. Both sources show a core-jet structure on parsec scale, while they are unresolved at the arcsecond scale. The high core dominance and the high variability brightness temperature make these NLSy1 galaxies good γ-ray source candidates. Fermi-Large Area Telescope detected γ-ray emission only from PKS 2004-447, with a γ-ray luminosity comparable to that observed in blazars. No γ-ray emission is observed for J1548+3511. Both sources are variable in X-rays. J1548+3511 shows a hardening of the spectrum during high activity states, while PKS 2004-447 has no spectral variability. A spectral steepening likely related to the soft excess is hinted below 2 keV for J1548+3511, while the X-ray spectra of PKS 2004-447 collected by XMM-Newton in 2012 are described by a single power law without significant soft excess. No additional absorption above the Galactic column density or the presence of an Fe line is detected in the X-ray spectra of both sources.STAMPAenArticle10.1093/mnras/stv18452-s2.0-84963515663000363651600050http://arxiv.org/abs/1509.02689v1https://academic.oup.com/mnras/article/453/4/4037/25936782015MNRAS.453.4037OFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation