J/ApJ/691/1862 Line-strength indices for 74 early-type galaxies (Matkovic+ 2009)
Kinematic properties and stellar populations of faint early-type galaxies.
II. Line-strength measurements of central Coma galaxies.
Matkovic A., Guzman R., Sanchez-Blazquez P., Gorgas J., Cardiel N.,
Gruel N.
<Astrophys. J., 691, 1862-1878 (2009)>
=2009ApJ...691.1862M 2009ApJ...691.1862M
ADC_Keywords: Abundances ; Clusters, galaxy ; Galaxies, spectra
Keywords: galaxies: abundances - galaxies: clusters: individual (Coma) -
galaxies: dwarf - galaxies: elliptical and lenticular, cD
Abstract:
We present line-strength measurements for 74 early-type galaxies in
the core of the Coma cluster reaching down to velocity dispersions,
σ, of 30km/s. The index-σ relations for our sample,
including galaxies with σ<100km/s (low-σ), differ in shape
depending on which index is used. We note two types of relations for
the metallic indices: one showing a break in the slope around ∼100km/s
and another group with strong linear relations between an index and
log σ. We find no connection between the behavior of
index-σ relations with either α- or Fe-peak elements.
However, we find indications that the relations are tighter for
indices which do not depend on the microturbulent velocities of
stellar atmospheres.
Description:
In this paper, we discuss measurements of line-strength indices for 74
early-type galaxies (out of which 36 are dE/dS0) in the center of the
Coma cluster. We provided a full description of the sample selection
and spectroscopic observations in Paper I (Matkovic & Guzman,
2005MNRAS.362..289M 2005MNRAS.362..289M). For the dE/dS0 sample selection we utilized
photometry from WIYN's Mini-Mosaic imager and the Isaac Newton
Telescope Wide Field Camera. We obtained the follow-up spectroscopic
data with the Hydra multifiber spectrograph on a WIYN 3.5m telescope.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 115 74 Index measurements
table2.dat 113 74 Index and model measurements
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See also:
VII/42 : GMP catalogue: galaxies in the Coma cluster (Godwin+ 1983)
J/A+AS/116/429 : Classification of Coma early galaxies (Andreon+ 1996)
J/A+AS/141/449 : Coma cluster early-type galaxies (Mehlert+, 2000)
J/A+A/395/753 : Spectroscopy of Coma early-type galaxies. II. (Wegner+, 2002)
J/A+A/407/423 : Coma cluster early-type galaxies. III. (Mehlert+, 2003)
J/ApJ/602/664 : Morphology of galaxies in Coma cluster core (Gutierrez+,
2004)
J/ApJS/175/462 : Spectroscopy of Coma early-type galaxies (Corsini+, 2008)
J/MNRAS/386/715 : Absorption-line strengths in Coma galaxies (Trager+, 2008)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- GMP The GMP galaxy number (Cat. VII/42)
6- 10 F5.3 0.1nm Ca4227 The Ca4227 Lick index
12- 16 F5.3 0.1nm e_Ca4227 Uncertainty in Ca4227
18- 22 F5.3 0.1nm G4300 The G4300 Lick index
24- 28 F5.3 0.1nm e_G4300 Uncertainty in G4300
30- 35 F6.3 0.1nm HgA The HγA Lick index
37- 41 F5.3 0.1nm e_HgA Uncertainty in HgA
43- 48 F6.3 0.1nm HgF The HγF Lick index
50- 54 F5.3 0.1nm e_HgF Uncertainty in HgF
56- 60 F5.3 0.1nm Fe4383 ? The Fe4383 Lick index
62- 66 F5.3 0.1nm e_Fe4383 ? Uncertainty in Fe4383
68- 73 F6.3 0.1nm Ca4455 ? The Ca4455 Lick index
75- 79 F5.3 0.1nm e_Ca4455 ? Uncertainty in Ca4455
81- 85 F5.3 0.1nm Fe4531 ? The Fe4531 Lick index
87- 91 F5.3 0.1nm e_Fe4531 ? Uncertainty in Fe4531
93- 97 F5.3 0.1nm C2-4668 ? The C24668 Lick index
99-103 F5.3 0.1nm e_C2-4668 ? Uncertainty in C2-4668
105-109 F5.3 0.1nm Hb ? The Hβ Lick index
111-115 F5.3 0.1nm e_Hb ? Uncertainty in Hb
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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 I4 --- GMP The GMP galaxy number (Cat. VII/42)
6- 10 F5.3 0.1nm Fe5015 ? The F5015 Lick index
12- 16 F5.3 0.1nm e_Fe5015 ? Uncertainty in Fe5015
18- 22 F5.3 mag Mg1 ? The Mg1 Lick index
24- 28 F5.3 mag e_Mg1 ? Uncertainty in Mg1
30- 34 F5.3 mag Mg2 ? The Mg2 Lick index
36- 40 F5.3 mag e_Mg2 ? Uncertainty in Mg2
42- 46 F5.3 0.1nm Mgb ? The Mgb Lick index
48- 52 F5.3 0.1nm e_Mgb ? Uncertainty in Mgb
54- 58 F5.3 0.1nm Fe5270 ? The Fe5270 Lick index
60- 64 F5.3 0.1nm e_Fe5270 ? Uncertainty in Fe5270
66- 70 F5.3 0.1nm Fe5335 ? The Fe5335 Lick index
72- 76 F5.3 0.1nm e_Fe5335 ? Uncertainty in Fe5335
78- 81 F4.1 Gyr Age ? Model age
83- 85 F3.1 Gyr e_Age ? Uncertainty in Age
87- 92 F6.3 [Sun] [Z/H] ? Metallicity
94- 98 F5.3 [Sun] e_[Z/H] ? Uncertainty in [Z/H]
100-104 F5.3 [Sun] [a/Fe] ? Log of α/Fe ratio
106-110 F5.3 [Sun] e_[a/Fe] ? Uncertainty in [a/Fe]
112-113 I2 --- SNR Signal-to-noise ratio
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History:
From electronic version of the journal
References:
Matkovic & Guzman, Paper I. 2005MNRAS.362..289M 2005MNRAS.362..289M
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 24-Feb-2011