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The parsec-scale radio properties of 232 active galactic nuclei (AGNs), mostof which are blazars, detected by the Large Area Telescope (LAT) on board theFermi Gamma-ray Space Telescope have been observed contemporaneously by theVery Long Baseline Array (VLBA) at 5 GHz. Data from both the first 11 months(1FGL) and the first 2 years (2FGL) of the Fermi mission were used toinvestigate these sources' gamma-ray properties. We use the ratio of thegamma-ray to radio luminosity as a measure of gamma-ray loudness. Weinvestigate the relationship of several radio properties to gamma-ray loudnessand to the synchrotron peak frequency. There is a tentative correlation betweengamma-ray loudness and synchrotron peak frequency for BL Lac objects in both1FGL and 2FGL, and for flat-spectrum radio quasars (FSRQs) in 2FGL. We findthat the apparent opening angle tentatively correlates with gamma-ray loudnessfor FSRQs, but only when we use the 2FGL data. We also find that the total VLBAflux density correlates with the synchrotron peak frequency for BL Lac objectsand FSRQs. The core brightness temperature also correlates with synchrotronpeak frequency, but only for the BL Lac objects. The low-synchrotron peaked(LSP) BL Lac object sample shows indications of contamination by FSRQs whichhappen to have undetectable emission lines. There is evidence that the LSP BLLac objects are more strongly beamed than the rest of the BL Lac objectpopulation.

Gamma-ray Loudness, Synchrotron Peak Frequency, and Parsec-Scale Properties of Blazars Detected by the Fermi Large Area Telescope