J/MNRAS/330/547 Local galaxy ages and metallicities (Terlevich+, 2002)
A catalogue and analysis of local galaxy ages and metallicities.
Terlevich A.I., Forbes D.A.
<Mon. Not. R. Astron. Soc. 330, 547 (2002)>
=2002MNRAS.330..547T 2002MNRAS.330..547T
ADC_Keywords: Galaxy catalogs ; Abundances, [Fe/H] ; Rotational velocities ;
Velocity dispersion
Keywords: galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: photometry
Abstract:
We have assembled a catalogue of relative ages, metallicities and
abundance ratios for about 150 local galaxies in field, group and
cluster environments. The galaxies span morphological types from cD
and ellipticals, to late-type spirals. Ages and metallicities were
estimated from high-quality published spectral line indices using
Worthey & Ottaviani (1997, Cat. J/ApJS/111/377) single stellar
population evolutionary models. The identification of galaxy age as a
fourth parameter in the fundamental plane (Forbes, Ponman & Brown,
1998ApJ...508L..43F 1998ApJ...508L..43F) is confirmed by our larger sample of ages. We
investigate trends between age and metallicity, and with other
physical parameters of the galaxies, such as ellipticity, luminosity
and kinematic anisotropy. We demonstrate the existence of a galaxy
age-metallicity relation similar to that seen for local galactic disc
stars, whereby young galaxies have high metallicity, while old
galaxies span a large range in metallicities. We also investigate the
influence of environment and morphology on the galaxy age and
metallicity, especially the predictions made by semi-analytic
hierarchical clustering models (HCM). We confirm that non-cluster
ellipticals are indeed younger on average than cluster ellipticals as
predicted by the HCM models. However we also find a trend for the more
luminous galaxies to have a higher [Mg/Fe] ratio than the lower
luminosity galaxies, which is opposite to the expectation from HCM
models.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 36 57 Galaxies excluded from the catalogue
table2.dat 36 182 Galaxy age, metallicity and abundance estimates
table4.dat 59 182 Galaxy properties
--------------------------------------------------------------------------------
See also:
J/ApJS/111/377 : Hγ + Hδ absorption features (Worthey+ 1997)
J/A+A/309/749 : Fundamental plane of early type galaxies (Prugniel+ 1996)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Sample Sample designation (1)
11- 19 A9 --- Cluster Cluster name
21- 40 A20 --- Reason Reason (2)
--------------------------------------------------------------------------------
Note (1): Sample designations as follows:
Carollo = Carollo et al., 1993MNRAS.265..553C 1993MNRAS.265..553C
Davies = Davies et al., 1993MNRAS.262..650D 1993MNRAS.262..650D
Fisher95 = Fisher et al., 1995ApJ...448..119F 1995ApJ...448..119F
Fisher96 = Fisher et al., 1996, Cat. J/ApJ/459/110
Longhetti = 1998, Cat. J/A+AS/130/251
Mehlert = Mehlert et al., 1997, in Mazure A., Casoli F., Durret F.,
Gerbal D., eds, Coma Berenices: A New Vision of an Old
Cluster. Word Scientific, , p. 107
Vazdekis = Vazdekis & Arimoto, 1999ApJ...525..144V 1999ApJ...525..144V
Note (2): We have excluded galaxies owing to suspected Hβ emission
filling, too large a quoted error on the Hβ index, or a lack of
either Hβ or Fe index measurements. See text for details.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Galaxy Galaxy name
13 A1 --- l_Age Limit flag on Age
14- 17 F4.1 Gyr Age ? Age
20 A1 --- l_[Fe/H] Limit flag on [Fe/H]
21- 25 F5.2 Sun [Fe/H] ? Metallicity
27- 31 F5.2 Sun [Mg/Fe] ? [Mg/Fe] abundance
33- 34 I2 --- r_Age [1/12] Sources of age, metallicity and
abundance ratios (1)
36 I1 --- q_Age [1/3] Quality index (2)
--------------------------------------------------------------------------------
Note (1): Sources of age, metallicity and abundance ratios are as follows:
1 = Carollo et al., 1993MNRAS.265..553C 1993MNRAS.265..553C
2 = Davies et al., 1993MNRAS.262..650D 1993MNRAS.262..650D
3 = Fisher et al., 1996, Cat. J/ApJ/459/110
4 = Fisher et al., 1995ApJ...448..119F 1995ApJ...448..119F
5 = Gonzalez, 1993, PhD thesis
6 = Goudfrooij et al., 1999Ap&SS.269..109G 1999Ap&SS.269..109G
7 = Halliday, 1998, PhD thesis
8 = Kuntschner, 1998MNRAS.295L..29K 1998MNRAS.295L..29K
9 = Longhetti et al., 1998, Cat. J/A+AS/130/251
10 = Mehlert et al., 1997, in Mazure A., Casoli F., Durret F.,
Gerbal D., eds, Coma Berenices: A New Vision of an Old Cluster.
Word Scientific, , p. 107
11 = Vazdekis & Arimoto, 1999ApJ...525..144V 1999ApJ...525..144V
12 = mean of several
Note (2): Quality index as follows:
1 = Ages with errors <±20% and metallicity errors <±0.1dex
2 = errors >±20% and >±0.1dex
3 = highly uncertain values (not used in analysis)
--------------------------------------------------------------------------------
Table 3: Other age estimates using different methods from the one utilized
for this paper.
--------------------------------------------------------------------------------
Galaxy Our age Other age Source
--------------------------------------------------------------------------------
NGC 1052 0.9 van Gorkom et al., 1986AJ.....91..791V 1986AJ.....91..791V
NGC 1700 2.3 2.5 Brown et al., 2000MNRAS.317..406B 2000MNRAS.317..406B
NGC 2865 <1.5 1.2 Forbes et al., 1998ApJ...508L..43F 1998ApJ...508L..43F
NGC 3156 0.9 Forbes et al., 1998ApJ...508L..43F 1998ApJ...508L..43F
NGC 3610 1.5-6.5 Whitmore et al., 1997AJ....114.1797W 1997AJ....114.1797W
NGC 3656 ∼1. Balcells, 1997ApJ...486L..87B 1997ApJ...486L..87B
NGC 3921 0.8 Forbes et al., 1998ApJ...508L..43F 1998ApJ...508L..43F
NGC 5322 1-3 Silva & Bothun, 1998AJ....116.2793S 1998AJ....116.2793S
NGC 6776 3.2 2-3 Sansom et al., 1988MNRAS.234..247S 1988MNRAS.234..247S
NGC 7252 0.7 Forbes et al., 1998ApJ...508L..43F 1998ApJ...508L..43F
NGC 7585 ∼1. A stars
ESO341-IG04 0.8 Bergvall et al., 1989A&A...222...49B 1989A&A...222...49B
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Galaxy Galaxy name
13- 18 A6 --- MType Morphological type (From NED)
20- 25 A6 --- Environ Environment (1)
27- 32 F6.2 Mpc Dist Distance, assumes H0=75
34- 39 F6.2 mag BMAG ? Absolute B magnitude
41- 43 I3 km/s Vrot ? Rotational velocity (2)
45- 47 I3 km/s sigma ? Velocity dispersion (2)
49- 52 F4.2 --- Ellip ? Ellipticity (2) (3)
54- 58 F5.2 --- ResFP ? Residual from the Fundamental Plane (2)
--------------------------------------------------------------------------------
Note (1): The environment is given either as
Field, Group or the name of the cluster
Note (2): Magnitude, rotation velocity, velocity dispersion, ellipticity
and R come from Prugniel & Simien, 1996, Cat. J/A+A/309/749,
Hypercat (Prugniel & Golev, 1999, in Carral P., Cepa J., eds, ASP
Conf. Ser. Vol. 163, Star Formation in Early Type Galaxies. Astron.
Soc. Pac., p. 296) or RC3, de Vaucouleurs et al., Cat. VII/155.
Note (3): Ellipticities for S0 galaxies are not listed
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 28-Mar-2002