February 2-5, 2021

Oral Presentation

Identification and Analysis of Interacting Galaxies Using Spatially Resolved Kinematics

Author(s): Kiyoaki Christopher Omori (Nagoya University) Tsutomu T. Takeuchi (Nagoya University, Institute of Statistical Mathematics)

Presenter: Kiyoaki Christopher Omori (Nagoya University)

Galaxy interactions and mergers are a fundamental and important process in galaxy evolution. When two galaxies come into close contact, a variety of processes can be triggered, such as star formation, disruptions in morphologies, and super-massive black hole growth.
Despite the importance of the process, we still do not have a complete understanding, and not many quantitative conclusions have been made.
This is due to the difficulty of creating a complete interacting galaxy catalogue, which can be attributed to the difficulty of establishing a classification criteria.
Previous studies of interacting galaxy classification primarily use visual identification techniques, which can suffer from the lack of complete data, and in addition are often not motivated physically, making it difficult to consider the physical processes taking place within a galaxy.

In this work, we present a physically motivated classification method, focusing on galaxy kinematics. Galaxy interactions can cause disturbances in a galaxy's kinematic structure. Thus, in interacting galaxies, we expect to find complex and disturbed kinematics.
We visually inspected the spatially resolved kinematic maps of galaxies in the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA, Bundy et al. 2015) survey, and identified and investigated galaxies with disturbed kinematics. We will discuss our sample and compare our classification results to other methods, as well as the difficulties of our method and future prospects.

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