8 papers
NOCTURNE. II. Extreme radio variability in the heart of early-stage active galactic nuclei
Emilia Järvelä, Patrizia Romano, Anne Lähteenmäki +1
We report the discovery of extreme 37 GHz radio variability in early-stage active galactic nuclei (AGN). Most of these sources belong to the class of narrow-line Seyfert 1 (NLS1) g…
Basic properties of Narrow-Line Seyfert 1 Galaxies with Relativistic Jets
L. Foschini, E. Angelakis, G. Bonnoli +25
We present the preliminary results of a survey performed with Swift to observe a sample of radio-loud Narrow-Line Seyfert 1 Galaxies (RLNLS1s). Optical-to-X-ray data from Swift are…
FUSE Observations of the Narrow-Line Seyfert 1 Galaxy Arakelian 564
P. Romano, S. Mathur, R. W. Pogge +2
We present a 63 ks FUSE observation of the Narrow-Line Seyfert 1 galaxy Arakelian 564. The spectrum is dominated by the strong emission in the O VI λ\lambda1032, 1038 resonance dou…
The Spectral Energy Distribution of the Seyfert galaxy Ton S180
T. J. Turner, P. Romano, S. B. Kraemer +14
We present spectral results from a multi-satellite, broad-band campaign on the Narrow-line Seyfert 1 galaxy Ton S180 performed at the end of 1999. We discuss the spectral-energy di…
Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. III. Optical Observations and the Optical--UV--X-ray Connection
O. Shemmer, P. Romano, R. Bertram +36
We present the results of a two-year long optical monitoring program of the narrow-line Seyfert 1 galaxy Akn 564. The majority of this monitoring project was also covered by X-ray…
Multiwavelength Monitoring of the Narrow-Line Seyfert 1 Galaxy Akn 564. I. ASCA Observations and the Variability of the X-ray Spectral Components
T. J. Turner, P. Romano, I. M. George +4
We present a 35 day ASCA observation of the NLS1 Akn 564, which was part of a multiwavelength AGN Watch monitoring campaign. Akn 564 shows a photon index varying across the range 2…