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Title: Recently Quenched Galaxies at z = 0.2–4.8 in the COSMOS UltraVISTA Field

Abstract

We present a new analysis of the stellar mass function and morphology of recently quenched galaxies (RQGs), whose star formation has been recently quenched for some reason. The COSMOS2015 catalog was exploited to select those galaxies at 0.2 < z < 4.8, over 1.5 deg{sup 2} of the Cosmic Evolution Survey (COSMOS) UltraVISTA field. This is the first time that RQGs are consistently selected and studied in such a wide range of redshift. We find increasing number density of RQGs with time in a broad mass range at z > 1, while low-mass RQGs start to grow very rapidly at z < 1. We also demonstrate that the migration of RQGs may largely drive the evolution of the stellar mass function of passive galaxies. Moreover, we find that the morphological type distribution of RQGs are intermediate between those of star-forming and passive galaxies. These results indicate that RQGs represent a major transitional phase of galaxy evolution, in which star-forming galaxies turn into passive galaxies, accompanied by the build up of spheroidal component.

Authors:
;  [1]
  1. Research Center for Space and Cosmic Evolution, Ehime University, 2-5 Bunkyo-cho, Matsuyama 790-8577 (Japan)
Publication Date:
OSTI Identifier:
22654449
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 843; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CATALOGS; DISTRIBUTION; EVOLUTION; GALAXIES; MASS; MIGRATION; RED SHIFT; STARS; UNIVERSE

Citation Formats

Ichikawa, Akie, and Matsuoka, Yoshiki, E-mail: ichikawa@cosmos.phys.sci.ehime-u.ac.jp. Recently Quenched Galaxies at z = 0.2–4.8 in the COSMOS UltraVISTA Field. United States: N. p., 2017. Web. doi:10.3847/2041-8213/AA78F8.
Ichikawa, Akie, & Matsuoka, Yoshiki, E-mail: ichikawa@cosmos.phys.sci.ehime-u.ac.jp. Recently Quenched Galaxies at z = 0.2–4.8 in the COSMOS UltraVISTA Field. United States. doi:10.3847/2041-8213/AA78F8.
Ichikawa, Akie, and Matsuoka, Yoshiki, E-mail: ichikawa@cosmos.phys.sci.ehime-u.ac.jp. Sat . "Recently Quenched Galaxies at z = 0.2–4.8 in the COSMOS UltraVISTA Field". United States. doi:10.3847/2041-8213/AA78F8.
@article{osti_22654449,
title = {Recently Quenched Galaxies at z = 0.2–4.8 in the COSMOS UltraVISTA Field},
author = {Ichikawa, Akie and Matsuoka, Yoshiki, E-mail: ichikawa@cosmos.phys.sci.ehime-u.ac.jp},
abstractNote = {We present a new analysis of the stellar mass function and morphology of recently quenched galaxies (RQGs), whose star formation has been recently quenched for some reason. The COSMOS2015 catalog was exploited to select those galaxies at 0.2 < z < 4.8, over 1.5 deg{sup 2} of the Cosmic Evolution Survey (COSMOS) UltraVISTA field. This is the first time that RQGs are consistently selected and studied in such a wide range of redshift. We find increasing number density of RQGs with time in a broad mass range at z > 1, while low-mass RQGs start to grow very rapidly at z < 1. We also demonstrate that the migration of RQGs may largely drive the evolution of the stellar mass function of passive galaxies. Moreover, we find that the morphological type distribution of RQGs are intermediate between those of star-forming and passive galaxies. These results indicate that RQGs represent a major transitional phase of galaxy evolution, in which star-forming galaxies turn into passive galaxies, accompanied by the build up of spheroidal component.},
doi = {10.3847/2041-8213/AA78F8},
journal = {Astrophysical Journal Letters},
number = 1,
volume = 843,
place = {United States},
year = {Sat Jul 01 00:00:00 EDT 2017},
month = {Sat Jul 01 00:00:00 EDT 2017}
}