Investigating powerful jets in radio-loud narrow-line Seyfert 1s

Orienti, M.; D'Ammando, F.; Larsson, J.; Finke, J.; Giroletti, M.; Dallacasa, D.; Isacsson, T.; Stoby Hoglund, J.

doi:10.1093/mnras/stv1845

Title: Investigating powerful jets in radio-loud narrow-line Seyfert 1s

Journal Article · Mon Sep 14 04:00:00 UTC 2015 · Monthly Notices of the Royal Astronomical Society

DOI: https://doi.org/10.1093/mnras/stv1845 · OSTI ID:1354919

Orienti, M. ^[1]; D'Ammando, F. ^[2]; Larsson, J. ^[3]; Finke, J. ^[4]; Giroletti, M. ^[1]; Dallacasa, D. ^[2]; Isacsson, T. ^[3]; Stoby Hoglund, J. ^[3]

National Inst. for Astrophysics (INAF), Firenze (Italy). Inst. of Radio Astronomy
National Inst. for Astrophysics (INAF), Firenze (Italy). Inst. of Radio Astronomy; Univ. of Bologna (Italy). Dept. of Physics and Astronomy
KTH Royal Inst. of Technology, Stockholm (Sweden). Dept. of Physics and Oskar Klein Centre
US Naval Research Lab., Washington, DC (United States)

Here, 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. Furthermore, 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. There was no γ-ray emission 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.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1354919

Journal Information:: Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Journal Issue: 4 Vol. 453; ISSN 0035-8711

Publisher:: Royal Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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