2019/10/01 by Beatrice Nyiransengiyumva, Mirjana Pović, Mirjana Povic +2
Physics and Astronomy · #Astronomy and Astrophysical Research #Distribution (mathematics) #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy formation and evolution #Gamma-ray bursts and supernovae #Relation (database) #Selection (genetic algorithm) #Transformation (genetics) #astro-ph.GA
paper · pdf · doi:10.1017/s1743921320002781
Proceedings paper of the IAU symposium "Nuclear Activity in Galaxies Across Cosmic Time" (Ethiopia) accepted to be published under the Cambridge University Press, eds. M. Povic, P. Marziani, J. Masegosa, H. Netzer, S. H. Negu, and S. B. Tessema
openalex publication_date 2019/10/01 · arxiv created 2020/04/02 · openalex created_date 2020/04/10 · arxiv updated 2021/07/14 · openalex updated_date 2026/08/05
Abstract The distribution of galaxies has been studied to show the difference between the blue cloud and red sequence and to define the green valley region. However, there are still many open questions regarding the importance of the green valley for understanding the morphological transformation and evolution of galaxies, how galaxies change from late-type to early-type and the role of AGN in galaxy formation and evolution scenario. The work focused on studying in more details the properties of green valley galaxies by testing the six most used selection criteria, differences between them, and how they may affect the main results and conclusions. The main findings are that, by selecting the green valley galaxies using different criteria, we are selecting different types of galaxies in terms of their stellar masses, sSFR, SFR, spectroscopic classification and morphological properties, where the difference was more significant for colour criteria than for sSFR and SFR vs. M * criteria.