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Investigating AGN/Starburst activities through ALMA multi-line observations in the mid-stage IR-bright merger VV 114

  • Toshiki Saito (a1) (a2), Daisuke Iono (a2) (a3), Min S. Yun (a4), Junko Ueda (a2), Daniel Espada (a2) (a5), Yoshiaki Hagiwara (a2), Masatoshi Imanishi (a2) (a3) (a6), Kentaro Motohara (a7), Kouichiro Nakanishi (a2) (a3) (a5), Hajime Sugai (a8), Ken Tateuchi (a7), Minju Lee (a1) (a2) and Ryohei Kawabe (a1) (a2) (a3)...

Abstract

We present ALMA cycle 0 observations of the luminous merger VV 114. One of the main goals is to investigate mechanisms of molecular line ratio enhancement. Regions with the high 12CO (1–0)/13CO (1–0) and 12CO (3–2)/12CO (1–0) is located at a central filamentary structure (∼6 kpc) in VV 114. The filament consists of the eastern nucleus and the overlap region, where the galaxy disks are colliding. We also investigate these molecular line ratios on the Kennicutt-Schmidt law. VV 114 fills a gap between the “starburst” sequence and the “normal disk” sequence, and regions with the high ratios show the high ΣSFR and ΣH2. We suggest that the high ratios in VV 114 are due to star-forming activities in the both progenitor's nuclei and the merger-induced overlap region.

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