Investigating powerful jets in radio-loud narrow-line Seyfert 1s
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1354919
- Grant/Contract Number:
- AC02-76SF00515
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Volume: 453; Journal Issue: 4; Journal ID: ISSN 0035-8711
- Publisher:
- Royal Astronomical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; galaxies: active; galaxies: Seyfert; gamma-rays: general; radio continuum: general
Citation Formats
Orienti, M., D'Ammando, F., Larsson, J., Finke, J., Giroletti, M., Dallacasa, D., Isacsson, T., and Stoby Hoglund, J. Investigating powerful jets in radio-loud narrow-line Seyfert 1s. United States: N. p., 2015.
Web. doi:10.1093/mnras/stv1845.
Orienti, M., D'Ammando, F., Larsson, J., Finke, J., Giroletti, M., Dallacasa, D., Isacsson, T., & Stoby Hoglund, J. Investigating powerful jets in radio-loud narrow-line Seyfert 1s. United States. https://doi.org/10.1093/mnras/stv1845
Orienti, M., D'Ammando, F., Larsson, J., Finke, J., Giroletti, M., Dallacasa, D., Isacsson, T., and Stoby Hoglund, J. Mon .
"Investigating powerful jets in radio-loud narrow-line Seyfert 1s". United States. https://doi.org/10.1093/mnras/stv1845. https://www.osti.gov/servlets/purl/1354919.
@article{osti_1354919,
title = {Investigating powerful jets in radio-loud narrow-line Seyfert 1s},
author = {Orienti, M. and D'Ammando, F. and Larsson, J. and Finke, J. and Giroletti, M. and Dallacasa, D. and Isacsson, T. and Stoby Hoglund, J.},
abstractNote = {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.},
doi = {10.1093/mnras/stv1845},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 453,
place = {United States},
year = {Mon Sep 14 00:00:00 EDT 2015},
month = {Mon Sep 14 00:00:00 EDT 2015}
}
Web of Science
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