摘要：The TANAMI program has been observing parsec-scale radio jets of southern (declination
south of − 30°)
γ-ray
bright AGN, simultaneously with Fermi/LAT monitoring of their
γ-ray
emission, via high-resolution radio imaging with Very Long Baseline Interferometry
techniques. We present the radio and γ-rayproperties of the TANAMI sources based on one
year of contemporaneous TANAMI and Fermi/LAT data. A large fraction (72%)
of the TANAMI sample can be associated with bright γ-ray sources for this time
range. Association rates differ for different optical classes with all BL Lacs, 76% of
quasars, and just 17% of galaxies detected by the LAT. Upper limits were established on
the γ-ray
flux from TANAMI sources not detected by LAT. This analysis led to the identification of
three new Fermi sources whose detection was later confirmed. The
γ-ray and
radio luminosities are related by Lγ ∝ Lr0.89±0.04. The brightness temperatures of the radio cores
increase with the average γ-ray luminosity and the presence of brightness
temperatures above the inverse Compton limit implies strong Doppler boosting in those
sources. The undetected sources have lower γ/radio luminosity ratios and lower contemporaneous
brightness temperatures. Unless the Fermi/LAT-undetected blazars are much
γ-ray-fainter than the
Fermi/LAT-detected sources, their γ-ray luminosity should not
be significantly lower than the upper limits calculated here.
