COSMOS2020: Exploring the Dawn of Quenching for Massive Galaxies at 3 < z < 5 with a New Color-selection Method
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COSMOS2020 : Exploring the Dawn of Quenching for Massive Galaxies at 3 < z < 5 with a New Color-selection Method. / Gould, Katriona M. L.; Brammer, Gabriel; Valentino, Francesco; Whitaker, Katherine E.; Weaver, John. R.; Lagos, Claudia del P.; Rizzo, Francesca; Franco, Maximilien; Hsieh, Bau-Ching; Ilbert, Olivier; Jin, Shuowen; Magdis, Georgios; J. McCracken, Henry; Mobasher, Bahram; Shuntov, Marko; Steinhardt, Charles L.; Strait, Victoria; Toft, Sune.
I: Astronomical Journal, Bind 165, Nr. 6, 248, 23.05.2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - COSMOS2020
T2 - Exploring the Dawn of Quenching for Massive Galaxies at 3 < z < 5 with a New Color-selection Method
AU - Gould, Katriona M. L.
AU - Brammer, Gabriel
AU - Valentino, Francesco
AU - Whitaker, Katherine E.
AU - Weaver, John. R.
AU - Lagos, Claudia del P.
AU - Rizzo, Francesca
AU - Franco, Maximilien
AU - Hsieh, Bau-Ching
AU - Ilbert, Olivier
AU - Jin, Shuowen
AU - Magdis, Georgios
AU - J. McCracken, Henry
AU - Mobasher, Bahram
AU - Shuntov, Marko
AU - Steinhardt, Charles L.
AU - Strait, Victoria
AU - Toft, Sune
PY - 2023/5/23
Y1 - 2023/5/23
N2 - We select and characterize a sample of massive (log(M (*)/M (circle dot)) > 10.6) quiescent galaxies (QGs) at 3 < z < 5 in the latest Cosmological Evolution Survey catalog (COSMOS2020). QGs are selected using a new rest-frame color-selection method, based on their probability of belonging to the quiescent group defined by a Gaussian mixture model (GMM) trained on rest-frame colors (NUV - U, U - V, V - J) of similarly massive galaxies at 2 < z < 3. We calculate the quiescent probability threshold above which a galaxy is classified as quiescent using simulated galaxies from the shark semi-analytical model. We find that, at z >= 3 in shark, the GMM/NUVU - VJ method outperforms classical rest-frame UVJ selection and is a viable alternative. We select galaxies as quiescent based on their probability in COSMOS2020 at 3 < z < 5, and compare the selected sample to both UVJ- and NUVrJ-selected samples. We find that, although the new selection matches UVJ and NUVrJ in number, the overlap between color selections is only similar to 50%-80%, implying that rest-frame color commonly used at lower-redshift selections cannot be equivalently used at z > 3. We compute median rest-frame spectral energy distributions for our sample and find the median QG at 3 < z < 5 has a strong Balmer/4000 angstrom break, and residual NUV flux indicating recent quenching. We find the number densities of the entire quiescent population (including post-starbursts) more than doubles from 3.5 +/- 2.2 x 10(-6) Mpc(-3) at 4 < z < 5 to 1.4 +/- 0.4 x 10(-5) Mpc(-3) at 3 < z < 4, confirming that the onset of massive galaxy quenching occurs as early as 3 < z < 5.
AB - We select and characterize a sample of massive (log(M (*)/M (circle dot)) > 10.6) quiescent galaxies (QGs) at 3 < z < 5 in the latest Cosmological Evolution Survey catalog (COSMOS2020). QGs are selected using a new rest-frame color-selection method, based on their probability of belonging to the quiescent group defined by a Gaussian mixture model (GMM) trained on rest-frame colors (NUV - U, U - V, V - J) of similarly massive galaxies at 2 < z < 3. We calculate the quiescent probability threshold above which a galaxy is classified as quiescent using simulated galaxies from the shark semi-analytical model. We find that, at z >= 3 in shark, the GMM/NUVU - VJ method outperforms classical rest-frame UVJ selection and is a viable alternative. We select galaxies as quiescent based on their probability in COSMOS2020 at 3 < z < 5, and compare the selected sample to both UVJ- and NUVrJ-selected samples. We find that, although the new selection matches UVJ and NUVrJ in number, the overlap between color selections is only similar to 50%-80%, implying that rest-frame color commonly used at lower-redshift selections cannot be equivalently used at z > 3. We compute median rest-frame spectral energy distributions for our sample and find the median QG at 3 < z < 5 has a strong Balmer/4000 angstrom break, and residual NUV flux indicating recent quenching. We find the number densities of the entire quiescent population (including post-starbursts) more than doubles from 3.5 +/- 2.2 x 10(-6) Mpc(-3) at 4 < z < 5 to 1.4 +/- 0.4 x 10(-5) Mpc(-3) at 3 < z < 4, confirming that the onset of massive galaxy quenching occurs as early as 3 < z < 5.
KW - POST-STARBURST GALAXIES
KW - STELLAR POPULATION SYNTHESIS
KW - STAR-FORMATION HISTORIES
KW - HUBBLE-SPACE-TELESCOPE
KW - SIMILAR-TO 4
KW - LESS-THAN 6
KW - QUIESCENT GALAXIES
KW - SPECTROSCOPIC CONFIRMATION
KW - PHYSICAL-PROPERTIES
KW - PASSIVE GALAXIES
U2 - 10.3847/1538-3881/accadc
DO - 10.3847/1538-3881/accadc
M3 - Journal article
VL - 165
JO - The Astronomical Journal
JF - The Astronomical Journal
SN - 0004-6256
IS - 6
M1 - 248
ER -
ID: 347970123