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Properties of green valley galaxies in relation to their selection criteria

Published online by Cambridge University Press:  29 January 2021

Beatrice Nyiransengiyumva ,
Mirjana Pović ,
Pheneas Nkundabakura  and
Antoine Mahoro
Beatrice Nyiransengiyumva
Affiliation:
Mbarara University of Science and Technology (MUST), P.O. Box 1410, Uganda University of Rwanda, College of Education, P.O. Box 5039, Kigali, Rwanda
Mirjana Pović
Affiliation:
Ethiopian Space Science and Technology Institute (ESSTI), Entoto Observatory and Research Center (EORC), Astronomy and Astrophysics Research and Development Division, P.O. Box 33679, Addis Ababa, Ethiopia Instituto de Astrofísica de Andalucía (IAA-CSIC), Glorieta de la Astronomía s/n, 18008 Granada, Spain
Pheneas Nkundabakura
Affiliation:
University of Rwanda, College of Education, P.O. Box 5039, Kigali, Rwanda
Antoine Mahoro
Affiliation:
South African Astronomical Observatory, P.O. BOX: 9 Observatory, Cape Town, South Africa Department of Astronomy, University of Cape Town, Private Bag X3, Rondebosch 7701, South Africa
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Abstract

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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.

Keywords

galaxies: activegalaxies: star formationgalaxies: fundamental parametersgalaxies: evolutionultraviolet: galaxiesmethods: statistical
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S356: Nuclear Activity in Galaxies Across Cosmic Time , October 2019 , pp. 152 - 157
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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