SIMBAD references

2015MNRAS.453.4037O - Mon. Not. R. Astron. Soc., 453, 4037-4050 (2015/November-2)

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. and STOBY HOGLUND J.

Abstract (from CDS):

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.

Abstract Copyright: © 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2015)

Journal keyword(s): galaxies: active - galaxies: Seyfert - gamma-rays: general - radio continuum: general

Simbad objects: 16

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2019.10.21-13:26:32

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