J/ApJ/805/121 Overdensities of 0<z<3 COSMOS galaxies (Darvish+, 2015)
A comparative study of density field estimation for galaxies: new insights into
the evolution of galaxies with environment in COSMOS out to z∼3.
Darvish B., Mobasher B., Sobral D., Scoville N., Aragon-Calvo M.
<Astrophys. J., 805, 121 (2015)>
=2015ApJ...805..121D 2015ApJ...805..121D (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Photometry ; Redshifts
Keywords: galaxies: evolution; large-scale structure of universe;
methods: data analysis
Abstract:
It is well-known that a galaxy's environment has a fundamental
influence in shaping its properties. We study the environmental
effects on galaxy evolution, with an emphasis on the environment
defined as the local number density of galaxies. The density field is
estimated with different estimators (weighted adaptive kernel
smoothing, 10th and 5th nearest neighbors, Voronoi and Delaunay
tessellation) for a Ks<24 sample of ∼190000 galaxies in the COSMOS
field at 0.1<z<3.1. The performance of each estimator is evaluated
with extensive simulations. We show that overall there is a good
agreement between the estimated density fields using different methods
over ∼2dex in overdensity values. However, our simulations show that
adaptive kernel and Voronoi tessellation outperform other methods.
Using the Voronoi tessellation method, we assign surface densities to
a mass complete sample of quiescent and star-forming galaxies out to
z∼3. We show that at a fixed stellar mass, the median color of
quiescent galaxies does not depend on their host environment out to
z∼3. We find that the number and stellar mass density of massive
(>1011M☉) star-forming galaxies have not significantly changed
since z∼3, regardless of their environment. However, for massive
quiescent systems at lower redshifts (z≲1.3), we find a significant
evolution in the number and stellar mass densities in denser
environments compared to lower density regions. Our results suggest
that the relation between stellar mass and local density is more
fundamental than the color-density relation and that environment plays
a significant role in quenching star-formation activity in galaxies at
z≲1.
Description:
In order to examine different density estimation techniques, we select
an area of ∼1.8 deg2 in the COSMOS field (Capak et al. 2007, II/284;
Scoville et al. 2007ApJS..172....1S 2007ApJS..172....1S). Here, we use the COSMOS
UltraVISTA Ks-band selected photometric redshift (photo-z) catalog
(McCracken et al. 2012, J/A+A/544/A156; Ilbert et al. 2013,
J/A+A/556/A55). This catalog consists of ground- and space-based
photometric data in 30 bands, spanning the range UV to mid-IR. The
total selected sample contains 191151 galaxies.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 45 191151 Overdensity values evaluated using the adaptive
kernel estimator for sample galaxies selected
in Section 2
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See also:
II/284 : COSMOS Multi-Wavelength Photometry Catalog (Capak+, 2007)
VII/265 : COSMOS Morphological Catalog (V1.1) (Tasca+ 2009)
VII/250 : The 2dF Galaxy Redshift Survey (2dFGRS) (2dFGRS Team, 1998-2003)
J/ApJS/209/10 : UGSs. V. kernel approach (Massaro+, 2013)
J/ApJ/777/18 : Stellar mass functions of galaxies to z=4 (Muzzin+, 2013)
J/A+A/556/A55 : Multi-color phot. of star-forming galaxies (Ilbert+, 2013)
J/ApJ/763/127 : GCls discovered in the SPT survey (Reichardt+, 2013)
J/A+A/544/A156 : UltraVISTA Catalogue Release DR1 (McCracken+, 2012)
J/ApJ/753/121 : zCOSMOS 20k sample group catalog to z≲1.2 (Knobel+, 2012)
J/MNRAS/423/1024 : XCS-DR1 Cluster Catalogue (Mehrtens+, 2012)
J/A+A/536/A8 : Planck early results. VIII. ESZ sample. (Planck+, 2011)
J/MNRAS/413/971 : Galaxy And Mass Assembly (GAMA) DR1 (Driver+, 2011)
J/ApJS/191/254 : GMBCG galaxy cluster catalog from SDSS DR7 (Hao+, 2010)
J/ApJ/697/1842 : zCOSMOS 10K sample group catalog to z=1 (Knobel+, 2009)
J/ApJ/669/714 : Subaru weak-lensing survey. I. (Miyazaki+, 2007)
J/ApJS/172/182 : XMM Clusters of galaxies in COSMOS field (Finoguenov+ 2007)
J/A+A/470/821 : BLOX Cluster catalog (Dietrich+, 2007)
J/ApJ/660/239 : MaxBCG cat. of galaxy clusters from SDSS (Koester+, 2007)
J/AJ/130/968 : SDSS-C4 cluster catalog (Miller+, 2005)
J/ApJS/157/1 : Red-Sequence Cluster Survey (Gladders+, 2005)
J/A+A/425/367 : REFLEX Galaxy Cluster Survey catalogue (Boehringer+, 2004)
J/AJ/123/1807 : SDSS galaxy clusters redshifts (Goto+, 2002)
J/ApJS/129/435 : NORAS galaxy cluster survey. I. (Bohringer+, 2000)
J/MNRAS/301/881 : The ROSAT brightest cluster sample - I. (Ebeling+, 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- Seq Running sequence number
8- 16 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
18- 24 F7.5 deg DEdeg Declination in decimal degrees (J2000)
26- 31 F6.4 --- zph [0.05/3.2] Ilbert et al. 2013, J/A+A/556/A55,
photometric redshift
33- 37 F5.2 mag Ksmag [15/24] McCracken et al. 2012, J/A+A/544/A156,
KS_AUTO magnitude
39- 45 F7.4 [-] logdel [-1.9/1.5]? log overdensity kernel (1)
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Note (1): A blank indicates that the value is not obtainable.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 15-Sep-2015