J/MNRAS/386/715 Absorption-line strengths in Coma galaxies (Trager+, 2008)
The stellar population histories of early-type galaxies. III. The Coma cluster.
Trager S.C., Faber S.M., Dressler A.
<Mon. Not. R. Astron. Soc., 386, 715-747 (2008)>
=2008MNRAS.386..715T 2008MNRAS.386..715T
ADC_Keywords: Clusters, galaxy ; Velocity dispersion ; Spectroscopy
Keywords: galaxies: clusters: individual: Coma (= Abell 1656) -
galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: stellar content
Abstract:
We present stellar population parameters of 12 elliptical and S0
galaxies in the Coma cluster around and including the cD galaxy NGC
4874, based on spectra obtained using the Low Resolution Imaging
Spectrograph on the Keck II Telescope. Our data are among the most
precise and accurate absorption-line strengths yet obtained for
cluster galaxies, allowing us to examine in detail the zero-point and
scatter in the stellar population properties of Coma cluster
early-type galaxies (ETGs).
Description:
The spectra were collected with the LRIS on the Keck II Telescope,
which has a 7.7arcmin long slit. We selected galaxies from Palomar
Observatory Sky Survey prints of the centre of the Coma cluster.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
galaxies.dat 16 187 The 187 galaxies with index strengths
tableb3.dat 122 368 Absorption-line index strengths, errors,
stellar population parameters, and errors of
Coma Cluster galaxies
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See also:
J/A+AS/141/449 : Coma cluster early-type galaxies (Mehlert+, 2000)
J/AJ/121/2331 : SDSS redshifts in the Coma cluster (Castander+, 2001)
J/A+A/407/423 : Coma cluster early-type galaxies. III. (Mehlert+, 2003)
J/A+A/463/455 : Nearby early-type gal. with ionized gas. III. (Annibali+ 2007)
Byte-by-byte Description of file: galaxies.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Galaxy Galaxy name
13- 16 A4 --- MType Morphological type
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Byte-by-byte Description of file: tableb3.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Galaxy Galaxy name
13- 16 A4 --- Sample Sample name (1)
18- 22 A5 --- MType Morphological type
24- 28 F5.3 [km/s] logsig Velocity dispersion
30- 34 F5.3 [km/s] e_logsig rms uncertainty on logsigma
36- 39 F4.2 --- Hbeta Hβ line strength
41- 44 F4.2 --- e_Hbeta rms uncertainty on Hbeta
46- 49 F4.2 --- Mgb Mgb line strength
51- 54 F4.2 --- e_Mgb rms uncertainty on Mgb
56- 59 F4.2 --- Fe5270 Fe5270 line strength
61- 64 F4.2 --- e_Fe5270 rms uncertainty on Fe5270
66- 69 F4.2 --- Fe5335 Fe5335 line strength
71- 74 F4.2 --- e_Fe5335 rms uncertainty on Fe5335
76- 80 F5.2 [Gyr] logt Estimated Age (2)
82- 85 F4.2 [Gyr] E_logt Error on Age (upper limit) (2)
87- 90 F4.2 [Gyr] e_logt Error on Age (lower limit) (2)
92- 96 F5.2 [Sun] [Z/H] Metallicity abundance (2)
98-101 F4.2 [Sun] E_[Z/H] Error on [Z/H] (upper limit) (2)
103-106 F4.2 [Sun] e_[Z/H] Error on [Z/H] (lower limit) (2)
108-112 F5.2 [Sun] [E/Fe] Enhancement ratio ([α/Fe]) (2)
114-117 F4.2 [Sun] E_[E/Fe] Error on [E/Fe] (upper limit) (2)
119-122 F4.2 [Sun] e_[E/Fe] Error on [E/Fe] (lower limit) (2)
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Note (1): Samples as follows:
J99 = Jorgensen, 1999MNRAS.306..607
LRIS = LRIS-ETG sample
M00 = Mehlert et al., 2000, Cat. J/A+AS/141/449
M02 = Moore et al., 2002MNRAS.336..382M 2002MNRAS.336..382M
NFPS = Nelan et al., 2005ApJ...632..137N 2005ApJ...632..137N
SB06 = Sanchez-Blazquez, 2006A&A...457..787S 2006A&A...457..787S
Note (2): Stellar population parameters from new models.
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History:
From electronic version of the journal
References:
Trager et al., Paper I 2000AJ....119.1645T 2000AJ....119.1645T
Trager et al., Paper II 2000AJ....120..165T 2000AJ....120..165T
(End) Patricia Vannier [CDS] 09-Jun-2009