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http://hdl.handle.net/20.500.12386/26018
Titolo: | Investigating powerful jets in radio-loud narrow-line Seyfert 1s | Autori: | ORIENTI, Monica D'AMMANDO, FILIPPO Larsson, J. Finke, J. GIROLETTI, MARCELLO Dallacasa, Daniele Isacsson, T. Stoby Hoglund, J. |
Data pubblicazione: | 2015 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 453 | Fascicolo: | 4 | Da pagina:: | 4037 | Abstract: | 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. | URI: | http://hdl.handle.net/20.500.12386/26018 | URL: | http://arxiv.org/abs/1509.02689v1 https://academic.oup.com/mnras/article/453/4/4037/2593678 |
ISSN: | 0035-8711 | DOI: | 10.1093/mnras/stv1845 | Bibcode ADS: | 2015MNRAS.453.4037O | Fulltext: | open |
È visualizzato nelle collezioni: | 1.01 Articoli in rivista |
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