EVOLUTION OF GALAXIES AND THEIR ENVIRONMENTS AT z = 0.1–3 IN COSMOS

By N. Scoville, Stéphane Arnouts, H. Aussel, A. Benson, A. Bongiorno, K. Bundy, M. Calvo, P. Capak, M. Carollo, F. Civano and 36 more. 2013

151 citations recorded by the source corpus.

Large-scale structures (LSSs) out to z < 3.0 are measured in the Cosmic Evolution Survey (COSMOS) using extremely accurate photometric redshifts (photoz). The Ks-band-selected sample (from Ultra-Vista) is comprised of 155,954 galaxies. Two techniques—adaptive smoothing and Voronoi tessellation—are used to estimate the environmental densities within 127 redshift slices. Approximately 250 statistically significant overdense structures are identified out to z = 3.0 with shapes varying from elongated filamentary structures to more circularly symmetric concentrations. We also compare the densities derived for COSMOS with those based on semi-analytic predictions for a ΛCDM simulation and find excellent overall agreement between the mean densities as a function of redshift and the range of densities. The galaxy properties (stellar mass, spectral energy distributions (SEDs), and star formation rates (SFRs)) are strongly correlated with environmental density and redshift, particularly at z < 1.0–1.2. Classifying the spectral type of each galaxy using the rest-frame b − i color (from the photoz SED fitting), we find a strong correlation of early-type galaxies (E-Sa) with high-density environments, while the degree of environmental segregation varies systematically with redshift out to z ∼ 1.3. In the highest density regions, 80% of the galaxies are early types at z = 0.2 compared to only 20% at z = 1.5. The SFRs and the star formation timescales exhibit clear environmental correlations. At z > 0.8, the SFR density is uniformly distributed over all environmental density percentiles, while at lower redshifts the dominant contribution is shifted to galaxies in lower density environments.

Subfields: Astronomy and Astrophysics, Instrumentation

View Paper: https://www.semanticscholar.org/paper/339180fef106398c08b17e32d92b644709ba85f2

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In Astronomy and Astrophysics

1. P. Capak
2. D. M. Alexander
3. A. Koekemoer
4. Mara Salvato
5. O. Ilbert
6. J. Dunlop
7. L. Hernquist
8. P. Hopkins

In Instrumentation

1. P. Capak
2. Mara Salvato
3. A. Koekemoer
4. O. Ilbert
5. J. Silverman
6. J. Dunlop
7. H. McCracken
8. N. Scoville

Citations in the corpus

• COSMOS2020: A Panchromatic View of the Universe to z ∼ 10 from Two Complementary Catalogs (2021, methodology): “The 2 deg2 of COSMOS have been used to trace large-scale structure (Scoville et al. 2013; Laigle et al. 2018), discover groups and clusters (e.g., Capak et al. 2011; Casey et al. 2015; Hung et al. 2016; Cucciati et al. 2018), and link galaxies to their dark matter halos (e.g., Leauthaud et al.…”
• Mass assembly in quiescent and star-forming galaxies since z ≃ 4 from UltraVISTA (2013, methodology): “Using the COSMOS sample, Scoville et al. (2013) find that low-mass quiescent galaxies appear in high density environment atz < 1.”
• ISM MASSES AND THE STAR FORMATION LAW AT Z = 1 TO 6: ALMA OBSERVATIONS OF DUST CONTINUUM IN 145 GALAXIES IN THE COSMOS SURVEY FIELD (2015, methodology): “This procedure was initially done by Scoville et al. (2013) with three galaxy samples.”
• THE EVOLUTION OF INTERSTELLAR MEDIUM MASS PROBED BY DUST EMISSION: ALMA OBSERVATIONS AT z = 0.3–2 (2014, methodology): “The SFRs are derived from the rest frame UV continuum and the infrared using Herschel PACS and SPIRE data as detailed in Scoville et al. (2013).”
• The DEIMOS 10K Spectroscopic Survey Catalog of the COSMOS Field (2018, background): “Comprehensive descriptions of the large-scale structure in the COSMOS Field have been presented by Scoville et al. (2007a, 2013), and Massey et al. (2007).”
• The realm of the galaxy protoclusters (2016, background): “The local trend of higher quiescent fractions in more denser environments or more massive halos continues toward higher redshifts, although it is considerably weaker at the highest redshifts considered (z ∼ 1−2; Quadri et al., 2012; Scoville et al., 2013; Lee et al., 2015).”
• THE COSMOS2015 CATALOG: EXPLORING THE 1 < z < 6 UNIVERSE WITH HALF A MILLION GALAXIES (2016, background): “Notwithstanding some observational studies (see also, e.g. Tempel & Libeskind 2013; Scoville et al. 2013; Darvish et al. 2014), accurately tracing the cosmic web remains challenging as long as we do not observe a sufficiently large area (at least on the scale of a few typical void sizes) with…”