J/A+A/563/A92 VIPERS: galaxy colours and luminosity function (Fritz+, 2014)
The VIMOS Public Extragalactic Redshift Survey (VIPERS):
A quiescent formation of massive red-sequence galaxies over the past 9 Gyr.
Fritz A., Scodeggio M., Ilbert O., Bolzonella M., Davidzon I., Coupon J.,
Garilli B., Guzzo L., Zamorani G., Abbas U., Adami C., Arnouts S., Bel J.,
Bottini D., Branchini E., Cappi A., Cucciati O., De Lucia G.,
de la Torre S., Franzetti P., Fumana M., Granett B.R., Iovino A.,
Krywult J., Le Brun V., Le Fevre O., Maccagni D., Malek K., Marulli F.,
Mccracken H.J., Paioro L., Polletta M., Pollo A., Schlagenhaufer H.,
Tasca L.A.M., Tojeiro R., Vergani D., Zanichelli A., Burden A.,
Di Porto C., Marchetti A., Marinoni C., Mellier Y., Moscardini L.,
Nichol R.C., Peacock J.A., Percival W.J., Phleps S., Wolk M.
<Astron. Astrophys., 563, A92 (2014)>
=2014A&A...563A..92F 2014A&A...563A..92F
ADC_Keywords: Galaxies, photometry ; Galaxy catalogs ; Magnitudes, absolute ;
Photometry, UBV ; Redshifts ; Surveys
Keywords: surveys - cosmology: observations - galaxies: evolution -
galaxies: photometry - galaxies: luminosity function, mass function -
galaxies: statistics
Abstract:
We explore the evolution of the colour-magnitude relation (CMR) and
luminosity function (LF) at 0.4<z<1.3 from the VIMOS Public
Extragalactic Redshift Survey (VIPERS) using ∼45000 galaxies with
precise spectroscopic redshifts down to i'AB<22.5 over ∼10.32deg2
in two fields. From z=0.5 to z=1.3 the LF and CMR are well defined for
different galaxy populations and M*B evolves by
∼1.04(1.09)±0.06(0.10) mag for the total (red) galaxy sample. We
compare different criteria for selecting early-type galaxies: (1) a
fixed cut in rest-frame (U-V) colours, (2) an evolving cut in (U-V)
colours, (3) a rest-frame (NUV-r')-(r'-K) colour selection, and (4) a
spectral-energy-distribution classification. The completeness and
contamination varies for the different methods and with redshift, but
regardless of the method we measure a consistent evolution of the
red-sequence (RS). Between 0.4<z<1.3 we find a moderate evolution of
the RS intercept of Δ(U-V)=0.28±0.14 mag, favouring
exponentially declining star formation (SF) histories with SF
truncation at 1.7≤z≤2.3. Together with the rise in the number
density of red galaxies by 0.64dex since z=1, this suggests a rapid
build-up of massive galaxies (M*>1011M☉) and expeditious RS
formation over a short period of ∼1.5Gyr starting before z=1. This is
supported by the detection of ongoing SF in early-type galaxies at
0.9<z<1.0, in contrast with the quiescent red stellar populations of
early-type galaxies at 0.5<z<0.6. There is an increase in the observed
CMR scatter with redshift, which is two times larger than observed in
galaxy clusters and at variance with theoretical model predictions. We
discuss possible physical mechanisms that support the observed
evolution of the red galaxy population. Our findings point out that
massive galaxies have experienced a sharp SF quenching at z∼1 with
only limited additional merging. In contrast, less-massive galaxies
experience a mix of SF truncation and minor mergers which build-up the
low- and intermediate-mass end of the CMR.
Description:
Completeness numbers, redshifts, colour intercept evolution,
dispersion, Schechter parameters and number densities of the
luminosity function are presented for ∼45000 galaxies between
0.4<z<1.3 from the VIMOS Public Extragalactic Redshift Survey
(VIPERS). In addition, redshifts, Schechter parameters and number
densities of the luminosity function are presented for the sub-samples
of Red and Red-SED galaxies. Completeness numbers are given for both
the parent photometric sample and the spectroscopic VIPERS sample.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 36 4 Percentage of early- and late-type galaxies in
parent and spectroscopic VIPERS sample
table2.dat 32 7 U-V colour intercept evolution for red-sequence
galaxies in VIPERS
table3.dat 62 18 Schechter parameters and associated 1-σ errors
of the global VIPERS Luminosity Function (LF)
and the LF for different sub-samples
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See also:
J/A+A/562/A23 : VIMOS Public Extragalactic Survey (VIPERS) DR1 (Garilli+ 2014)
J/A+A/570/A106 : VIPERS. Searching for cosmic voids (Micheletti+, 2014)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- Type Spectrophotometric type classification
8- 11 F4.1 % Pfrl Parent sample between 0.4<z<0.5
13- 16 F4.1 % Sfrl Spec sample between 0.4<z<0.5
18- 21 F4.1 % Pfrm Parent sample between 0.5<z<0.6
23- 26 F4.1 % Sfrm Spec sample between 0.5<z<0.6
28- 31 F4.1 % Pfrh Parent sample between 0.6<z<1.0
33- 36 F4.1 % Sfrh Spec sample between 0.6<z<1.0
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 F4.2 --- z [0.47/1.09] Median spectroscopic redshift
6- 9 I4 --- Ngal [250/3360] Number of galaxies
11- 14 F4.2 mag int U-V colour intercept (1)
16- 20 F5.3 mag msig Measured scatter (Poissonian statistics)
22- 26 F5.3 mag osig Observed scatter (measured + systematic)
28- 32 F5.3 mag cdisp Observed colour dispersion of the CMR (2)
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Note (1): U-V colour intercept evolution at MV-5*log10(h)=-20 for a fixed
slope of d(U-V)/d(MV)=-0.08.
Note (2): Observed colour dispersion of the Color-Magnitude Relation
σ(U-V) between -19.0≥MV≥-23.5.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Samp Sample: "Red", "Red_SED", or "All" (1)
9- 11 F3.1 --- zmin Minimum of redshift interval
13- 15 F3.1 --- zmax Maximum of redshift interval
17- 21 I5 --- Ngal [45/10386] Number of galaxies in bin
23- 27 F5.2 --- alpha Slope α (2)
29- 32 F4.2 --- e_alpha ?=- Error on alpha
34- 39 F6.2 mag M* Characteristic Schechter magnitude,
M*B -5log10(h) (2) (3)
41- 44 F4.2 mag e_M* Error on M*
46- 50 F5.2 10-3Mpc-3 phi Schechter function parameter φ* (2) (4)
53- 56 F4.2 10-3Mpc-3 E_phi Error on phi* (positive value)
59- 62 F4.2 10-3Mpc-3 e_phi Error on phi* (negative value)
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Note (1): Schechter parameters and associated 1-σ errors 2*Δ(ln),
L=1 of the global VIPERS LF and the LF for different sub-samples derived
in the rest-frame Johnson B-band filter system. Parameters listed without
errors are set 'ad hoc' to the given value. Parameters were derived using
H0=(100h)km/s, Ωm=0.25, Ω_Λ=0.75.
Note (2): Parameters of the empirical Schechter function:
φ(L)dL = φ*e-L/L*(L/L*)αd(L/L*).
Note (3): M*B values are corrected for -5.log10(h).
Note (4): φ* values are in units of 10-3.h3.Mpc-3.
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Acknowledgements:
Alexander Fritz, afritz( at )iasf-milano.inaf.it
(End) A. Fritz [INAF-IASF Milano, Italy], P. Vannier [CDS] 20-Nov-2014