J/AJ/165/248 COSMOS2020; 230 quiescent galaxies at 3<z<5 (Gould+, 2023)
COSMOS2020; Exploring the Dawn of Quenching for Massive Galaxies at 3<z<5 with
a New Color-selection Method.
Gould K.M.L., Brammer G., Valentino F., Whitaker K.E., Weaver J.R.,
del Lagos C. P, Rizzo F., Franco M., Hsieh B.-C., Ilbert O., Jin S.,
Magdis G., McCracken H. J, Mobasher B., Shuntov M., Steinhardt C.L.,
Strait V., Toft S.
<Astron. J., 165, 248 (2023)>
=2023AJ....165..248G 2023AJ....165..248G
ADC_Keywords: Galaxies; Star Forming Region; Redshifts; Infrared
Keywords: Quenched galaxies ; High-redshift galaxies ; Galaxy
classification systems ; Gaussian mixture model
Abstract:
We select and characterize a sample of massive (log(M*/M☉)>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 ∼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/4000Å 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±2.2x10-6Mpc-3 at 4<z<5 to 1.4±0.4x10-5Mpc-3 at
3<z<4, confirming that the onset of massive galaxy quenching occurs as
early as 3<z<5.
Description:
The Cosmological Evolution Survey is currently the deepest NIR
wide-field multiwavelength survey that provides data over 2deg2 of
the sky
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 62 230 Sample quiescent galaxies
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See also:
II/373 : The fourth UltraVISTA data release (DR4) (Moneti+, 2019)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/AJ/131/1184 : Recalibration of optical photometry (Maiz-Apellaniz+, 2006)
J/ApJ/682/985 : FIREWORKS photometry of GOODS CDF-S (Wuyts+, 2008)
J/ApJ/735/86 : NEWFIRM MBS; photometric catalogs (Whitaker+, 2011)
J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)
J/A+A/556/A55 : Multi-color photometry star-forming galaxies (Ilbert+, 2013)
J/ApJ/777/18 : Stellar mass functions of galaxies to z=4 (Muzzin+, 2013)
J/ApJS/214/24 : 3D-HST+CANDELS catalog (Skelton+, 2014)
J/ApJS/224/24 : The COSMOS2015 catalog (Laigle+, 2016)
J/A+A/618/A85 : Spectroscopy of 3<z<4 quiescent galaxies (Schreiber+ 2018)
J/MNRAS/483/3060 : Candidate massive galaxies at z∼4 in DES (Guarnieri+, 2019)
J/MNRAS/490/3309 : Massive passive galaxies at the Cosmic Dawn (Merlin+, 2019)
J/MNRAS/496/695 : Timing the earliest quenching events (Carnall+, 2020)
J/ApJ/897/44 : 120 3≤z≤5 galaxies cand in CANDELS fields (Shahidi+, 2020)
J/ApJS/258/11 : The COSMOS2020 catalog (Weaver+, 2022)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- ID Identifier
8- 16 F9.5 deg RAdeg [149/151] Right Ascension (J2000)
18- 26 F9.5 deg DEdeg [1/3] Declination (J2000)
28- 32 F5.3 --- z [3.03/4.86] Photometric redshift
34- 41 E8.2 Msun Mass [44100000000/855000000000] Galactic mass
43- 50 F8.3 Msun/yr SFR [0.009/1612] Star formation rate
52- 56 F5.3 --- pq50 [0.01/1] Median boot-strapped quiescent
probability distribution
58- 62 F5.3 --- pq95 [0.13/1] The 95% boot-strapped quiescent
probability distribution
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 05-Oct-2023