Fermi Gamma-ray Space Telescope

Radio and Gamma-ray Characteristics of the Brightest Extragalactic Jets in the Southern Sky

C. Mueller
M. Kadler, R. Ojha, F. Krauss, B. Carpenter, on behalf of the TANAMI & Fermi colls., M. Boeck, A. Kreikenbohm, R. Schulz, J. Truestedt, J. Wilms, on behalf of the TANAMI collaboration

Abstract:

TANAMI is the largest project observing the brightest extragalactic jets in the Southern sky using VLBI and near-contemporaneous multiwavelength observations. Since the launch of Fermi, we monitor a sample of ~90 sources. Combined high-resolution VLBI and Fermi/LAT monitoring allows us to investigate the differences in radio structure and high-energy properties of gamma-ray loud vs. faint sources. Here, we present the results of our simultaneous VLBI/gamma-ray study showing that gamma-ray detected sources tend to be more compact and have higher brightness temperatures and luminosities. We highlight our findings for individual sources of particular interest such as the nearest AGN Centaurus A, the gamma-NLSy1 galaxy PKS2004-447 and PMNJ1603-4904, possibly a gamma-ray loud young radio source. The parsec-scale structure of these particular gamma-ray sources give valuable information on intrinsic jet parameters and help us to further constrain the high energy emission origin.