J/A+A/620/A186 Properties of VIS3COS galaxies (Paulino-Afonso+, 2018)
VIS3COS: I. survey overview and the role of environment and stellar mass on
star formation.
Paulino-Afonso A., Sobral D., Darvish B., Ribeiro B., Stroe A., Best P.,
Afonso J., Matsuda Y.
<Astron. Astrophys. 620, A186 (2018)>
=2018A&A...620A.186P 2018A&A...620A.186P (SIMBAD/NED BibCode)
ADC_Keywords: Clusters, galaxy ; Redshifts
Keywords: galaxies: clusters - galaxies: evolution -
galaxies: high redshift - large-scale structure of Universe
Abstract:
We present the VIMOS Spectroscopic Survey of a Supercluster in the
COSMOS field (VIS3COS) at z∼0.84. We use VIMOS high-resolution
spectra (GG475 filter) to spectroscopically select 490 galaxies in and
around the superstructure and an additional 481 galaxies in the line
of sight. We present the redshift distribution, the catalogue to be
made public, and the first results on the properties of individual
galaxies and stacked spectra (3500Å<λ<4200Å rest-frame).
We probe a wide range of densities and environments (from low-density
field to clusters and rich groups). We find a decrease in the median
star formation rate from low- to high-density environments in all bins
of stellar mass and a sharp rise of the quenched fraction {(from ∼10%
to ∼40-60%)} of intermediate-stellar-mass galaxies
(10<log10M*/M☉)<10.75) from filaments to clusters. The
quenched fraction for massive galaxies shows little dependence on
environment, being constant at ∼30-40%.
We find a break in the strength of the [OII] emission, with nearly
constant line equivalent widths at lower densities (~-11Å) and then
a drop to ~-2.5Å towards higher densities. The break in the [OII]
line strength happens at similar densities
(log10(1+δ)∼0.0-0.5) as the observed rise in the quenched
fraction. Our results may provide further clues regarding the
different environmental processes affecting galaxies with different
stellar masses and highlight the advantages of a single dataset in the
COSMOS field probing a wide range of stellar masses and environments.
We hypothesise that quenching mechanisms are enhanced in high-density
regions.
Description:
Main properties of galaxies observed with the VIS3COS survey. For each
source we make available the spectroscopic redshift, the K-band
magnitude, the stellar mass, the star formation rate and the local
overdensity measure.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 59 696 VIS3COS' galaxy properties
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See also:
J/ApJ/690/1236 : COSMOS photometric redshift catalog (Ilbert+, 2009)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- ID VIS3COS ID string (VIS3COS-NNN)
13- 22 F10.6 deg RAdeg Right ascension (J2000.0) (1)
24- 31 F8.6 deg DEdeg Declination (J2000.0) (1)
33- 38 F6.4 --- z Measured spectroscopic redshift
40- 43 F4.1 mag Kmag ?=- K-band magnitude (AB) (1)
45- 48 F4.1 [Msun] logM ?=- log10 of stellar mass
(derived with magphys)
50- 53 F4.1 [Msun/yr] logSFR ?=- log10 of star formation rate
(derived with magphys)
55- 59 F5.2 [---] log(1+Delta) ?=- log10 of local overdensity estimate (2)
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Note (1): From Ilbert et al., 2009, Cat. J/ApJ/690/1236
Note (2): from Darvish et al., 2015ApJ...814...84D 2015ApJ...814...84D, 2017ApJ...837...16D 2017ApJ...837...16D.
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Acknowledgements:
Ana Paulino-Afonso, aafonso(at)oal.ul.pt
(End) Ana Paulino-Afonso [IA, Portugal], Patricia Vannier [CDS] 13-Dec-2018