The Korean very-long-baseline interferometry (VLBI) network (KVN) and VLBI Exploration of Radio Astrometry (VERA) Array (KaVA) is the rst international VLBI array dedicated to high-frequency (23 GHz (K-band) and 43 GHz (Q-band)) observations in East Asia. To evaluate the imagine capability of KaVA, we performed imaging observations of three bright active galactic nuclei (AGNs) known for their complex morphologies: 4C 39.25, 3C 273, and M87 by KaVA at K-/Q-band. Our KaVA images reveal extended out ows with complex substructure such as knots and limb brightening, in agreement with previous observations by other VLBI facilities. Angular resolutions are better than 1.4 and 0.8 milliarcsecond (max) at K-/Q-band, respectively. KaVA achieves a high dynamic range of ~1000, more than three times the value achieved by VERA. We conclude that KaVA is a powerful array with a great potential for the study of AGN out ows, at least comparable to the best existing radio interferometric arrays.

ABSTRACT
1. KVN AND VERA ARRAY (KaVA)
2. TEST OBSERVATIONS AND VLBI IMAGES
3. EVALUATION OF THE IMAGING CAPABILITY OFKaVA
4. FUTURE PROSPECTS
REFERENCES

• Kotaro Niinuma(Graduate School of Science and Engineering, Yamaguchi University)
• Sang-Sung Lee(Korea Astronomy and Space Science Institute)
• Motoki Kino(Korea Astronomy and Space Science Institute)
• Bon Won Sohn(Korea Astronomy and Space Science Institute)
• On Behalf of KaVA AGN Sub Working Group(Graduate School of Science and Engineering, Yamaguchi University)