Investigating powerful jets in radio-loud narrow-line Seyfert 1s
Orienti, M. ; DAmmando, F. ; Larsson, J. ; et al. ; - ASI Sponsor
Sep - 2015
DOI: 10.1093/mnras/stv1845
ISSN : 1365-2966 ;
journal : Monthly Notices of the Royal Astronomical Society

Volume : 453 ; Issue : 4
type: Article Journal

We 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.Key words

keywords : galaxies: active galaxies: Seyfert gamma-rays: general radio continuum: general

Notes : "The Fermi-LAT Collaboration acknowledges generous ongoing support from a number of agencies and institutes that have supported both the development and the operation of the LAT as well as scientific data analysis. These include [...] the Agenzia Spaziale Italiana..."