Relativistic jets of active galactic nuclei have been known to exist for 100 years. Blazars with
their jet pointing close to our line of sight are some of the most variable and extreme objects …

We report the discovery by the Swift hard X-ray monitor of the transient source Swift J2058.
4+ 0516 (Sw J2058+ 05). Our multi-wavelength follow-up campaign uncovered a long-lived …

The discovery in 2008 of high-energy gamma-rays from Narrow-Line Seyfert 1 Galaxies
(NLS1s) made it clear that there were active galactic nuclei (AGN) other than blazars and …

We report the discovery with Fermi/LAT of γ-ray emission from three radio-loud narrow-line
Seyfert 1 galaxies: PKS 1502+ 036 (z= 0.409), 1H 0323+ 342 (z= 0.061), and PKS 2004 …

We discuss the relationship between a standard Shakura & Sunyaev accretion disc model
and the big blue bump (BBB) observed in Type 1 active galactic nuclei. Given the similarity …

We have conducted a multiwavelength survey of 42 radio loud narrow-1ine Seyfert 1
galaxies (RLNLS1s), selected by searching among all the known sources of this type and …

Abstract We report Fermi Large Area Telescope (LAT) observations of the radio-loud active
galactic nucleus SBS 0846+ 513 (z= 0.5835), optically classified as a narrow-line Seyfert 1 …

We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that were previously
classified as radio silent and two that were classified as radio quiet. These detections reveal …

In 2008, the Fermi Gamma-ray Space Telescope has revealed-for the first time-high-energy
(E> 100 MeV) gamma rays from a few Narrow-Line Seyfert 1 Galaxies (NLS1s). Later, in …

Narrow-line Seyfert 1 (NLS1) galaxies are unevolved active galactic nuclei (AGNs) that exist
predominantly in spiral galaxies. However, mostly due to the small number of sources …