Oral Presentation

A systematic investigation of environmental dependencies of galactic properties across the Hubble sequence

Author(s): Kun-Bao, Yang (Department of Physics, NTU, Taiwan) Yen-Ting, Lin (ASIAA, Taiwan) Po-Feng, Wu (Graduate Institute of Astrophysics, NTU, Taiwan) Dylan Nelson (Universität Heidelberg, Zentrum für Astronomie, ITA ,Heidelberg, Germany)

Presenter: Kun-Bao Yang (NTU)

We have conducted a systematic study of the dependencies on environments of several key galactic properties (such as size, color, 4000 Angstrom break strength, star formation rate) for elliptical, lenticular, early and late-type disk galaxies separately, using a low redshift volume-limited galaxy sample from Sloan Digital Sky Survey (SDSS), finding that the dependencies, albeit varying systematically with the Hubble sequence, are typically rather weak. We have further examined such dependencies using galaxies produced by IllustrisTNG, finding generally good agreement, especially for central galaxies. Our results suggest that, whatever mechanisms that are responsible for transformation of morphologies of galaxies must have taken place at high-z such that by z~0, environmental dependencies are nearly washed out.