Blazar nuclei in radio-loud narrow-line Seyfert 1?
| Autor: | R. M. Sambruna, Luigi Foschini, Laura Maraschi, Gabriele Ghisellini, Mario Gliozzi, Fabrizio Tavecchio |
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| Rok vydání: | 2009 |
| Předmět: |
High Energy Astrophysical Phenomena (astro-ph.HE)
Physics Atmospheric Science Astrophysics::High Energy Astrophysical Phenomena FOS: Physical sciences Aerospace Engineering Astronomy Astronomy and Astrophysics Conclusive evidence Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Spectral line Radio spectrum Geophysics Astrophysical jet Space and Planetary Science General Earth and Planetary Sciences Astrophysics - High Energy Astrophysical Phenomena Blazar X ray spectra Fermi Gamma-ray Space Telescope Line (formation) |
| Zdroj: | Advances in Space Research. 43:889-894 |
| ISSN: | 0273-1177 |
| Popis: | It has been suggested that some radio-loud narrow-line Seyfert 1 contain relativistic jets, on the basis of their flat-spectrum radio nuclei and studies on variability. We present preliminary results of an ongoing investigation of the X-ray and multiwavelength properties of 5 radio-loud NLS1 based on archival data from Swift and XMM-Newton. Some sources present interesting characteristics, very uncharacteristic for a radio-quiet narrow-line Seyfert 1, such as very hard X-ray spectra, and correlated optical and ultraviolet variability. However, none of the studied sources show conclusive evidence for relativistic jets. gamma-ray observations with Fermi are strongly recommended to definitely decide on the presence or not of relativistic jets. Comment: 9 pages, 4 figures. Talk presented at the 37th COSPAR Assembly (Montreal, Canada, July 13-20, 2008), Session E17. Accepted for publication on Advances in Space Research |
| Databáze: | OpenAIRE |
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