Selection of Massive Evolved Galaxies at 3 ≤ z ≤ 4.5 in the CANDELS Fields

Using the CANDELS photometric catalogs for the Hubble Space Telescope/ACS and WFC3, we identified massive evolved galaxies at 3 < z < 4.5 employing three different selection methods. We find the comoving number density of these objects to be ∼2 × 10−5 and 8 × 10−6 Mpc−3 after correction for co...

Full description

Saved in:
Bibliographic Details
Published in:The Astrophysical journal 2020-07, Vol.897 (1), p.44
Main Authors: Shahidi, Abtin, Mobasher, Bahram, Nayyeri, Hooshang, Hemmati, Shoubaneh, Wiklind, Tommy, Chartab, Nima, Dickinson, Mark, Finkelstein, Steven L, Pacifici, Camilla, Papovich, Casey, Ferguson, Henry C., Fontana, Adriano, Giavalisco, Mauro, Koekemoer, Anton, Newman, Jeffery, Sattari, Zahra, Somerville, Rachel
Format: Article
Language:English
Subjects:
Astronomical models
Astrophysics
Bins
Cold gas
Computer simulation
Density
Deposition
Extragalactic astronomy
Galactic evolution
Galaxies
Galaxy evolution
Halos
High-redshift galaxies
Hubble Space Telescope
Numerical simulations
Red shift
Space telescopes
Stars & galaxies
Stellar evolution
Stellar mass
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Using the CANDELS photometric catalogs for the Hubble Space Telescope/ACS and WFC3, we identified massive evolved galaxies at 3 < z < 4.5 employing three different selection methods. We find the comoving number density of these objects to be ∼2 × 10−5 and 8 × 10−6 Mpc−3 after correction for completeness for two redshift bins centered at z = 3.4, 4.7. We quantify a measure of how much confidence we should have for each candidate galaxy from different selections and what the conservative error estimates propagated into our selection are. Then we compare the evolution of the corresponding number densities and their stellar mass density with numerical simulations, semianalytical models, and previous observational estimates, which shows slight tension at higher redshifts as the models tend to underestimate the number and mass densities. By estimating the average halo masses of the candidates (Mh 4.2, 1.9, and 1.3 × 1012 M for redshift bins centered at z = 3.4, 4.1, and 4.7), we find them to be consistent with halos that were efficient in turning baryons to stars, relatively immune to the feedback effects, and on the verge of transition into hot-mode accretion. This can suggest the relative cosmological starvation of the cold gas followed by an overconsumption phase in which the galaxy rapidly consumes the available cold gas as one of the possible drivers for the quenching of the massive evolved population at high redshift.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ab96c5