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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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 241 215 Lick/IDS spectroscopic indices and velocity dispersions
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
Bytes Format Units Label Explanations
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) 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)
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
Acknowledgements: Patricia Sanchez-Blazquez, psanchez-blazquez(at)
(End) Patricia Sanchez-Blazquez [UCLan], Patricia Vannier [CDS] 14-May-2009
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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