J/A+A/499/47 Lick indices of EDCSN galaxies (Sanchez-Blazquez+, 2009)
Evolution of Cluster Red-Sequence Galaxies from redshift 0.8 to 0.4:
ages, metallicities and morphologies.
Sanchez-Blazquez P., Jablonka P., Noll S., Poggianti B.M., Moustakas J.,
Milvang-Jensen B., Halliday C., Aragon-Salamanca A., Saglia R.P., Desai V.,
De Lucia G., Clowe D.I., Pello R., Rudnick G., Simard L., White S.D.M.,
Zaritsky D.
<Astron. Astrophys. 499, 47 (2009)>
=2009A&A...499...47S 2009A&A...499...47S
ADC_Keywords: Clusters, galaxy ; Spectroscopy ; Velocity dispersion
Keywords: galaxies: evolution - galaxies: elliptical and lenticular -
galaxies: clusters: general - galaxies: stellar content -
galaxies: high-redshift - galaxies: abundances
Abstract:
We present a comprehensive analysis of the stellar population
properties (age, metallicity and the alpha-element enhancement [E/Fe])
and morphologies of red-sequence galaxies in 24 clusters and groups
from z∼0.75 to z∼0.45. The dataset, consisting of 215 spectra drawn
from the ESO Distant Cluster Survey, constitutes the largest
spectroscopic sample at these redshifts for which such an analysis has
been conducted. Analysis reveals that the evolution of the stellar
population properties of red-sequence galaxies depend on their mass:
while the properties of most massive are well described by passive
evolution and high-redshift formation, the less massive galaxies
require a more extended star formation history. We show that these
scenarios reproduce the index-sigma relations as well as the galaxy
colours. The two main results of this work are (1) the evolution of
the line-strength indices for the red-sequence galaxies can be
reproduced if 40% of the galaxies with sigma<175km/s entered the
red-sequence between z=0.75 to z=0.45, in agreement with the fraction
derived in studies of the luminosity functions, and (2) the percentage
of galaxies in the red-sequence with early-type morphologies (E/S0)
decreases by 20% from z=0.75 to z=0.45. This can be understood if the
red-sequence gets populated at later times with disc galaxies with
quenched star formation. We conclude that the processes quenching star
formation do not necessarily produce a simultaneous morphological
transformation of the galaxies entering the red-sequence.
Description:
We present a table with the 11 Lick/IDS spectroscopic indices and the
velocity dispersions for a sample of galaxies in the RED-sequence of
24 clusters extracted from EDisCS. The table include only galaxies
with no-or-weak (EW[OII]3727<7Å) emission lines, with a minimum
signal-to-noise per Angstroem of 10 and with velocity dispersions
larger than 100km/s.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 241 215 Lick/IDS spectroscopic indices and velocity
dispersions
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See also:
J/A+A/444/365 : ESO Distant Cluster Survey, EDisCS (White+, 2005)
J/A+A/482/419 : ESO Distant Cluster Survey, EDisCS. II (Milvang-Jensen+, 2008)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- --- [EDCSN]
6- 21 A16 --- EDCSN Galaxy name (JHHMMSSs-DDMMSSs)
22- 23 A2 --- m_EDCSN [.1 ] Multiplicity (for J1202432-1224227)
26- 32 F7.4 0.1nm D4000 ? D4000 index (Bruzual, 1993ApJ...405..538B 1993ApJ...405..538B)
34- 40 F7.4 0.1nm e_D4000 ? Error on D4000
42 I1 --- q_D4000 [0/2] Quality index on D4000 (1)
44- 50 F7.4 0.1nm HdA HδA Lick/IDS index
52- 58 F7.4 0.1nm e_HdA Error on HdA
60 I1 --- q_HdA [0/3] Quality index on HdA (1)
62- 68 F7.4 0.1nm HdF HδF Lick/IDS index
70- 76 F7.4 0.1nm e_HdF Error on HdF
78 I1 --- q_HdF [0/2] Quality index on HdF (1)
80- 86 F7.4 mag CN2 CN2 Lick/IDS index
88- 94 F7.4 mag e_CN2 Error on CN2 Lick/IDS index
96 I1 --- q_CN2 [0/2] Quality index on CN2 (1)
98-104 F7.4 0.1nm Ca4227 Ca4227 Lick/IDS index in Angstroems
106-112 F7.4 0.1nm e_Ca4227 Error on Ca4227
114 I1 --- q_Ca4227 [0/2] Quality index on Ca4227 (1)
116-122 F7.4 0.1nm G4300 ? G4300 Lick/IDS index
124-130 F7.4 0.1nm e_G4300 ? Error on G4300
132 I1 --- q_G4300 [0/2] Quality index on G4300 (1)
134-141 F8.4 0.1nm HgA ? HγA Lick/IDS index
143-149 F7.4 0.1nm e_HgA ? Error on HgA
151 I1 --- q_HgA [0/2] Quality index on HgA (1)
153-159 F7.4 0.1nm HgF ? HγF Lick/IDS index
161-167 F7.4 0.1nm e_HgF ? Error on HgF
169 I1 --- q_HgF [0/2] Quality index on HgF (1)
171-177 F7.4 0.1nm Fe4383 ? Fe4383 Lick/IDS index
179-185 F7.4 0.1nm e_Fe4383 ? Error on Fe4383
187 I1 --- q_Fe4383 [0/2] Quality index on Fe4383 (1)
189-195 F7.4 0.1nm Ca4455 ? Ca4455 Lick/IDS index
197-203 F7.4 0.1nm e_Ca4455 ? Error on Ca4455
205 I1 --- q_Ca4455 [0/2] Quality index on Ca4455 (1)
207-213 F7.4 0.1nm Fe4531 ? Fe4531 Lick/IDS index
215-221 F7.4 0.1nm e_Fe4531 ? Error on Fe4531
223 I1 --- q_Fe4531 [0/2] Quality index on Fe4531 (1)
225 I1 --- Em [1/2] Emission lines, as:
1=no emission, 2=weak emission lines
227-232 F6.2 km/s sigma Velocity dispersion
234-239 F6.2 km/s e_sigma Error in velocity dispersion
241 I1 --- q_sigma [0/2] Quality index on sigma (1)
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Note (1): Quality of the measured index based on visual inspection
of the spectrum as follows:
0 = good values
1 = Index affected by sky substraction residuals
or other detector problems
2 = Index affected by an emission line
3 = not explained
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Acknowledgements:
Patricia Sanchez-Blazquez, psanchez-blazquez(at)uclan.ac.uk
(End) Patricia Sanchez-Blazquez [UCLan], Patricia Vannier [CDS] 14-May-2009