Classification of Morphology of Interacting Galaxy Systems Tae-Yang Bang (KNU) Changbom Park (KIAS), Myeong-Gu Park (KNU)

Introduction In Park & Choi (2005), ~ 10% of early-type galaxies (ETGs) toward to blue side (u-r < 2.5) in u-r vs g-i gradient space. Classified Interacting galaxy pairs by their interacting features and compared parameters. Park & Choi. 2005

Introduction – Data set KIAS VAGC (Choi et al. 2010) 0.02 < z < 0.047, r < 17.6 Nearest galaxy conditions (Park & Choi. 2009) 1. Nearest neighbor galaxy of a target galaxy is located closest on the sky. 2. Nearest neighbor galaxy has to satisfy the magnitude condition that absolute magnitude of the nearest neighbor galaxy is brighter than Mtarget + 0.5. 3. Nearest neighbor galaxy also has to satisfy the radial velocity condition that radial velocity difference less than Δυ = 600 km s−1 (early-type target) or 400 km s−1 (late-type target). 8,542 galaxy pairs

Center type. Spiral tidal bridge extends to the center of ETG

Edge type. Spiral tidal bridge extends to the edge of ETG

Conclusion & Future work Center Type and Edge Type galaxy pairs are very close pairs (~20 kpc) in comparison with other pairs (~50 kpc) and show very clear interacting features. ETGs of Edge Type are brighter but not more massive than those of Center Type. And spirals of Center Type are more massive but slightly dimmer than those of Edge Type. Comparing with Center Type pairs, Edge Type pairs have higher angular momentum. In color-color gradient space, spiral galaxies of Center types are redder and have more positive color gradient than those of Edge types. We need much more Center Type and Edge Type samples to deduce statistically significant conclusion. Comparing with simulation.

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