Investigating the growing population of massive quiescent galaxies at cosmic noon

We explore the build-up of quiescent galaxies using a sample of 28 469 massive (M⋆ ≥ 1011 M☉) galaxies at redshifts 1.5 < zz < 3.0, drawn from a 17.5 deg2 area (0.33 Gpc3 comoving volume at these redshifts). This allows for a robust study of the quiescent fraction as a function of mass at 1.5 < zz < 3.0 with a sample ∼40 times larger at log(M⋆/ M⊙)≥11.5M⊙)≥11.5 than previous studies. We derive the quiescent fraction using three methods: specific star formation rate, distance from the main sequence, and UVJ colour-colour selection. All three methods give similar values at 1.5 < zz < 2.0, however the results differ by up to a factor of 2 at 2.0 < zz < 3.0. At redshifts 1.5 < zz < 3.0, the quiescent fraction increases as a function of stellar mass. By zz = 2, only 3.3 Gyr after the big bang, the universe has quenched ∼25 per cent of M⋆ = 1011 M☉ galaxies and ∼45 per cent of M⋆ = 1012 M☉ galaxies. We discuss physical mechanisms across a range of epochs and environments that could explain our results. We compare our results with predictions from hydrodynamical simulations SIMBA and IllustrisTNG and semi-analytic models (SAMs) SAG, SAGE, and Galacticus. The quiescent fraction from IllustrisTNG is higher than our empirical result by a factor of 2-5, while those from SIMBA and the three SAMs are lower by a factor of 1.5-10 at 1.5 < zz < 3.0Fil: Sherman, Sydney. Department Of Astronomy; Estados UnidosFil: Jogee, Shardha. Department Of Astronomy; Estados UnidosFil: Florez, Jonathan. Department Of Astronomy; Estados UnidosFil: Stevans, Matthew L. Department Of Astronomy; Estados UnidosFil: Kawinwanichakij, Lalitwadee. Kavli Institute For The Physics And Mathematics Of The; JapónFil: Wold, Isak. Nasa Goddard Space Flight Center; Estados UnidosFil: Finkelstein, Steven L. Department Of Astronomy; Estados UnidosFil: Papovich, Casey. Department Of Physics And Astronomy; Estados UnidosFil: Ciardullo, Robin. Department Of Astronomy And Astrophysics; Estados UnidosFil: Gronwall, Caryl. Department Of Astronomy And Astrophysics; Estados UnidosFil: Cora, Sofia Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Hough, Tomas. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Vega Martínez, Cristian Antonio. Instituto de Investigación Multidisciplinar En Ciencia; Chil

AGN and star formation at cosmic noon: comparison of data to theoretical models

In theoretical models of galaxy evolution, active galactic nucleus (AGN) and star formation (SF) activity are closely linked and AGN feedback is routinely invoked to regulate galaxy growth. In order to constrain such models, we compare the hydrodynamical simulations IllustrisTNG and SIMBA, and the semi-analytical model SAG to the empirical results on AGN and SF at cosmic noon (0.75 1011M⊙⁠) at z ∼ 2. (ii) In SIMBA, the mean SFR of galaxies with high X-ray luminosity AGN is lower than the SFR of galaxies without such AGN. Contrary to the data, many high X-ray luminosity AGN in SIMBA have quenched SF, suggesting that AGN feedback, or other feedback modes in galaxies with such AGN, might be too efficient in SIMBA.Fil: Florez, Jonathan. University of Texas at Austin; Estados UnidosFil: Jogee, Shardha. University of Texas at Austin; Estados UnidosFil: Guo, Yuchen. University of Texas at Austin; Estados UnidosFil: Cora, Sofia Alejandra. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Weinberger, Rainer. Harvard-Smithsonian Center for Astrophysics; Estados UnidosFil: Davé, Romeel. University of Edinburgh; Reino UnidoFil: Hernquist, Lars. Harvard-Smithsonian Center for Astrophysics; Estados UnidosFil: Vogelsberger, Mark. Kavli Institute for Astrophysics and Space Research; Estados UnidosFil: Ciardullo, Robin. The Pennsylvania State University; Estados UnidosFil: Finkelstein, Steven L.. The University Of Texas At Austin; Estados UnidosFil: Gronwall, Caryl. The Pennsylvania State University; Estados UnidosFil: Kawinwanichakij, Lalitwadee. The University of Tokyo; JapónFil: Leung, Gene C. K.. The University Of Texas At Austin; Estados UnidosFil: LaMassa, Stephanie. Space Telescope Science Institute; Estados UnidosFil: Papovich, Casey. Texas A&M University; Estados UnidosFil: Stevans, Matthew L.. The University Of Texas At Austin; Estados UnidosFil: Wold, Isak. Nasa Goddard Space Flight Center; Estados Unido

The Atacama Cosmology Telescope: SZ-based masses and dust emission from IR-selected cluster candidates in the SHELA survey

We examine the stacked thermal Sunyaev-Zel\text{'}dovich (SZ) signals for a sample of galaxy cluster candidates from the Spitzer-HETDEX Exploratory Large Area (SHELA) Survey, which are identified in combined optical and infrared SHELA data using the redMaPPer algorithm. We separate the clusters into three richness bins, with average photometric redshifts ranging from 0.70 to 0.80. The richest bin shows a clear temperature decrement at 148 GHz in the Atacama Cosmology Telescope data, which we attribute to the SZ effect. All richness bins show an increment at 220 GHz, which we attribute to dust emission from cluster galaxies. We correct for dust emission using stacked profiles from Herschel Stripe 82 data, and allow for synchrotron emission using stacked profiles created by binning source fluxes from NVSS data. We see dust emission in all three richness bins, but can only confidently detect the SZ decrement in the highest richness bin, finding $M_{500}$ = $8.7^{+1.7}_{-1.3} \times 10^{13} M_\odot$. Neglecting the correction for dust depresses the inferred mass by 26 percent, indicating a partial fill-in of the SZ decrement from thermal dust and synchrotron emission by the cluster member galaxies. We compare our corrected SZ masses to two redMaPPer mass--richness scaling relations and find that the SZ mass is lower than predicted by the richness. We discuss possible explanations for this discrepancy, and note that the SHELA richnesses may differ from previous richness measurements due to the inclusion of IR data in redMaPPer.Comment: 14 pages, 7 figures. Submitted to MNRA

AGN and star formation at cosmic noon : Comparison of data to theoretical models

In theoretical models of galaxy evolution, active galactic nucleus (AGN) and star formation (SF) activity are closely linked and AGN feedback is routinely invoked to regulate galaxy growth. In order to constrain such models, we compare the hydrodynamical simulations IllustrisTNG and SIMBA, and the semi-analytical model SAG to the empirical results on AGN and SF at cosmic noon (0.75 1011M⊙⁠) at z ∼ 2. (ii) In SIMBA, the mean SFR of galaxies with high X-ray luminosity AGN is lower than the SFR of galaxies without such AGN. Contrary to the data, many high X-ray luminosity AGN in SIMBA have quenched SF, suggesting that AGN feedback, or other feedback modes in galaxies with such AGN, might be too efficient in SIMBA.Instituto de Astrofísica de La Plat

ZFOURGE/CANDELS: On the Evolution of \u3cem\u3eM\u3c/em\u3e* Galaxy Progenitors from \u3cem\u3ez\u3c/em\u3e=3 to 0.5*

Galaxies with stellar masses near M* contain the majority of stellar mass in the universe, and are therefore of special interest in the study of galaxy evolution. The Milky Way (MW) and Andromeda (M31) have present-day stellar masses near M*, at 5 × 1010 M ☉ (defined here to be MW-mass) and 1011 M ☉ (defined to be M31-mass). We study the typical progenitors of these galaxies using the FOURSTAR Galaxy Evolution Survey (ZFOURGE). ZFOURGE is a deep medium-band near-IR imaging survey, which is sensitive to the progenitors of these galaxies out to z ~ 3. We use abundance-matching techniques to identify the main progenitors of these galaxies at higher redshifts. We measure the evolution in the stellar mass, rest-frame colors, morphologies, far-IR luminosities, and star formation rates, combining our deep multiwavelength imaging with near-IR Hubble Space Telescope imaging from Cosmic Near-IR Deep Extragalactic Legacy Survey (CANDELS), and Spitzer and Herschel far-IR imaging from Great Observatories Origins Deep Survey-Herschel and CANDELS-Herschel. The typical MW-mass and M31-mass progenitors passed through the same evolution stages, evolving from blue, star-forming disk galaxies at the earliest stages to redder dust-obscured IR-luminous galaxies in intermediate stages and to red, more quiescent galaxies at their latest stages. The progenitors of the MW-mass galaxies reached each evolutionary stage at later times (lower redshifts) and with stellar masses that are a factor of two to three lower than the progenitors of the M31-mass galaxies. The process driving this evolution, including the suppression of star formation in present-day M* galaxies, requires an evolving stellar-mass/halo-mass ratio and/or evolving halo-mass threshold for quiescent galaxies. The effective size and SFRs imply that the baryonic cold-gas fractions drop as galaxies evolve from high redshift to z ~ 0 and are strongly anticorrelated with an increase in the Sérsic index. Therefore, the growth of galaxy bulges in M* galaxies corresponds to a rapid decline in the galaxy gas fractions and/or a decrease in the star formation efficiency

The FourStar Galaxy Evolution Survey (ZFOURGE): Ultraviolet to Far-infrared Catalogs, Medium-bandwidth Photometric Redshifts with Improved Accuracy, Stellar Masses, and Confirmation of Quiescent Galaxies to z ~3.5

Interstellar matter and star formatio