We report first results from KVN and VERA Array (KaVA) VLBI observations obtained in the frame of our Plasma-physics of Active Galactic Nuclei (PAGaN) project. We observed eight selected AGN at 22 and 43 GHz in single polarization (LCP) between March 2014 and April 2015. Each source was observed for 6 to 8 hours per observing run to maximize the uv coverage. We obtained a total of 15 deep high-resolution images permitting the identification of individual circular Gaussian jet components and three spectral index maps of BL Lac, 3C 111 and 3C 345 from simultaneous dual-frequency observations. The spectral index maps show trends in agreement with general expectations – flat core and steep jets – while the actual value of the spectral index for jets shows indications for a dependence on AGN type. We analyzed the kinematics of jet components of BL Lac and 3C 111, detecting superluminal proper motions with maximum apparent speeds of about 5c. This constrains the lower limits of the intrinsic component velocities to  0.98c and the upper limits of the angle between jet and line of sight to 20◦. In agreement with global jet expansion, jet components show systematically larger diameters d at larger core distances r, following the global relation d  0.2r, albeit within substantial scatter.

Abstract
1. INTRODUCTION
2. OBSERVATIONS AND DATA REDUCTION
3. RESULTS
    3.1. 1055+018 (4C+01.28)
    3.2. 0133+476 (DA55)
    3.3. 1642+690 (4C+69.21)
    3.4. 3C 120
    3.5. 3C 84
    3.6. BL Lac
    3.7. 3C 111
    3.8. 3C 345
4. DISCUSSION
    4.1. Spectral Index
    4.2. Kinematics of Jet Components
    4.3. Jet Expansion
5. CONCLUSIONS
REFERENCES

• Bong Won Sohn(Korea Astronomy and Space Science Institute)
• Sang-Sung Lee(Korea Astronomy and Space Science Institute)
• Motoki Kino(Korea Astronomy and Space Science Institute)
• Daewon Kim(Department of Physics and Astronomy, Seoul National University)
• Taeseok Lee(Department of Physics and Astronomy, Seoul National University)
• Jong-Ho Park(Department of Physics and Astronomy, Seoul National University)
• Jae-Young Kim(Department of Physics and Astronomy, Seoul National University/Max-Planck Institut f¨ur Radioastronomie)
• Sincheol Kang(University of Science and Technology/Korea Astronomy and Space Science Institute)
• Sascha Trippe(Department of Physics and Astronomy, Seoul National University) Corresponding author
• Junghwan Oh(Department of Physics and Astronomy, Seoul National University)