천문학회보 (The Bulletin of The Korean Astronomical Society)
- 제44권1호
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- Pages.34.3-34.3
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- 2019
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- 1226-2692(pISSN)
Galaxy Rotation Coherent with the Average Motion of Neighbors
- Lee, Joon Hyeop (Korea Astronomy and Space Science Institute) ;
- Pak, Mina (Korea Astronomy and Space Science Institute) ;
- Lee, Hye-Ran (Korea Astronomy and Space Science Institute) ;
- Song, Hyunmi (Korea Astronomy and Space Science Institute)
- 발행 : 2019.04.10
초록
We report our discovery of observational evidence for the coherence between galaxy rotation and the average motion of neighbors. Using the Calar Alto Legacy Integral Field Area (CALIFA) survey data analyzed with the Python CALIFA STARLIGHT Synthesis Organizer (PyCASSO) platform, and the NASA-Sloan Atlas (NSA) catalog, we estimate the angular momentum vectors of 445 CALIFA galaxies and build composite maps of their neighbor galaxies on the parameter space of velocity versus distance. The composite radial profiles of the luminosity-weighted mean velocity of neighbors show striking evidence for dynamical coherence between the rotational direction of the CALIFA galaxies and the average moving direction of their neighbor galaxies. The signal of such dynamical coherence is significant for the neighbors within 800 kpc distance from the CALIFA galaxies with a confidence level of
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