Kreikenbohm, Annika

A Multi-Wavelength Study of the RL-NLSy1 Galaxy PKS 2004-447.

Author list: A. Kreikenbohm , M. Kadler , J. Wilms , R. Ojha , E. Ros, C. Müller, K. Mannheim, D. Elsässer

The recent detection of variable gamma-ray emission in five radio-loud Narrow Line Seyfert 1 (RL-NLSy1) galaxies demonstrates that these sources carry powerful relativistic jets, similar to blazars and radio galaxies. While radio-quiet NLSy1 sources are known to accrete at a low Eddington rates, RL-NLSy1s show near-Eddington accretion rates along with strong radio- and gamma-ray emission. Since gamma-ray loud RL-NLSy1 show properties of both radio-loud and radio-quiet AGN, they provide excellent laboratories to study the conditions for AGN to ignite powerful relativistic jets. Among the five known sources, PKS 2004-447 (z=0.240) plays a key role, because it shows intriguing optical, X-ray, and radio properties. We conducted a five months multi-wavelength monitoring campaign of PKS 2004-447 in 2012 including two deep XMM-Newton X-ray observations in May and October 2012, connected by monthly Swift observations and TANAMI VLBI observations. Here, we present first results from X-ray spectroscopy and VLBI imaging of the parsec-scale structure.