J/MNRAS/392/1265 Faint red galaxies in Coma cluster spectroscopy (Smith+, 2009)
A spectroscopic survey of dwarf galaxies in the Coma cluster:
stellar populations, environment and downsizing.
Smith R.J., Lucey J.R., Hudson M.J., Allanson S.P., Bridges T.J.,
Hornschemeier A.E., Marzke R.O., Miller N.A.
<Mon. Not. R. Astron. Soc., 392, 1265-1294 (2009)>
=2009MNRAS.392.1265S 2009MNRAS.392.1265S
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Spectroscopy
Keywords: galaxies: clusters: individual: Coma - galaxies: dwarf -
galaxies: elliptical and lenticular, cD - galaxies: evolution -
galaxies: formation
Abstract:
We investigate the stellar populations in a sample of 89 faint red
galaxies in the Coma cluster, using high signal-to-noise ratio (S/N)
spectroscopy from the 6.5-m MMT. Our sample is drawn from two 1°
fields, one centred on the cluster core and the other located 1°
to the south-west of the cluster centre. The target galaxies are
mostly 2-4mag fainter than M*; galaxies with these luminosities have
been previously studied only using small samples, or at low S/N. For a
comparison sample we use published high-S/N data for red-sequence
galaxies in the Shapley supercluster. We use state-of-the-art stellar
population models (by R. Schiavon, Cat. J/ApJS/171/146) to interpret
the absorption-line indices and infer the single-burst-equivalent age
and metallicity (Fe/H) for each galaxy, as well as the abundances of
the light elements Mg, Ca, C and N.
Description:
Spectra were obtained at the 6.5-m MMT using the Hectospec fibre-fed
spectrograph, in parallel with a redshift survey of faint candidate
cluster members (Marzke et al., in preparation). The observations were
performed in queue-mode over the period 2007 February-April, mainly
within five days of new moon.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablee1.dat 291 89 Absorption-line index data for the Coma sample
tablee2.dat 92 89 Derived parameters for the Coma dwarf galaxy sample
tablee3.dat 95 66 *Stellar population parameters from EZ-AGES for
the Shapley sample
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Note on tablee3.dat: Other relevant parameters for these galaxies,
including the individual line index measurements, were tabulated
by Smith et al. (2007, Cat. J/MNRAS/381/1035).
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See also:
VII/42 : GMP catalogue: galaxies in the Coma cluster (Godwin+ 1983)
J/MNRAS/381/1035 : Spectroscopy in Shapley supercluster (Smith+, 2007)
Byte-by-byte Description of file: tablee1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- GMP GMP number
6- 7 I2 h RAh Right ascension (J2000)
8 A1 --- --- [:]
9- 10 I2 min RAm Right ascension (J2000)
11 A1 --- --- [:]
12- 15 F4.1 s RAs Right ascension (J2000)
17 A1 --- DE- Declination sign (J2000)
18- 19 I2 deg DEd Declination (J2000)
20 A1 --- --- [:]
21- 22 I2 arcmin DEm Declination (J2000)
23 A1 --- --- [:]
24- 25 I2 arcsec DEs Declination (J2000)
27- 31 F5.2 mag umag SDSS u magnitude
33- 37 F5.2 mag gmag SDSS g magnitude
39- 43 F5.2 mag rmag SDSS r magnitude
45- 49 F5.2 mag imag SDSS i magnitude
51- 55 F5.2 mag zmag SDSS z magnitude
57- 61 F5.2 0.1nm HdA HδA index
63- 66 F4.2 0.1nm e_HdA rms uncertainty on HdA
68- 72 F5.2 0.1nm HdF HδA index
74- 77 F4.2 0.1nm e_HdF rms uncertainty on HdF
79- 84 F6.3 mag CN1 CN1 index
86- 91 F6.3 mag e_CN1 rms uncertainty on CN1
93- 98 F6.3 mag CN2 CN2 index
100-105 F6.3 mag e_CN2 rms uncertainty on CN2
107-111 F5.2 0.1nm Ca4227 Ca4227 index
113-119 F7.2 0.1nm e_Ca4227 rms uncertainty on Ca4227
121-125 F5.2 0.1nm G4300 G4300 index
127-130 F4.2 0.1nm e_G4300 rms uncertainty on G4300
132-136 F5.2 0.1nm HgA HγA index
138-141 F4.2 0.1nm e_HgA rms uncertainty on HgA
143-147 F5.2 0.1nm HgF HγF index
149-152 F4.2 0.1nm e_HgF rms uncertainty on HgF
154-158 F5.2 0.1nm Fe4383 Fe4383 index
160-163 F4.2 0.1nm e_Fe4383 rms uncertainty on Fe4383
165-169 F5.2 0.1nm Ca4455 Ca4455 index
171-174 F4.2 0.1nm e_Ca4455 rms uncertainty on Ca4455
176-180 F5.2 0.1nm Fe4531 Fe4531 index
182-185 F4.2 0.1nm e_Fe4531 rms uncertainty on Fe4531
187-191 F5.2 0.1nm Fe4668 Fe4668 index
193-196 F4.2 0.1nm e_Fe4668 rms uncertainty on Fe4668
198-202 F5.2 0.1nm Hb Hβ index
204-207 F4.2 0.1nm e_Hb rms uncertainty on Hb
209-213 F5.2 0.1nm Fe5015 Fe5015 index
215-221 F7.2 0.1nm e_Fe5015 rms uncertainty on Fe5015
223-227 F5.2 0.1nm Mgb Mgb5177 index
229-232 F4.2 0.1nm e_Mgb rms uncertainty on Mgb
234-239 F6.3 mag Mg1 Mg1 index
241-245 F5.3 mag e_Mg1 rms uncertainty on Mg1
247-252 F6.3 mag Mg2 Mg2 index
254-258 F5.3 mag e_Mg2 rms uncertainty on Mg2
260-264 F5.2 0.1nm Fe5270 Fe5270 index
266-269 F4.2 0.1nm e_Fe5270 rms uncertainty on Fe5270
271-275 F5.2 0.1nm Fe5335 Fe5335 index
277-280 F4.2 0.1nm e_Fe5335 rms uncertainty on Fe5335
282-286 F5.2 0.1nm Fe5406 ?=- Fe5406 index
288-291 F4.2 0.1nm e_Fe5406 ?=- rms uncertainty on Fe5406
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Byte-by-byte Description of file: tablee2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- GMP GMP number
5 A1 --- n_GMP [ab] Pecularity on galaxy (1)
7- 10 F4.2 [solLum] logL Luminosity (2)
12- 16 F5.3 [km/s] log.sig ?=- Velocity dispersion from literature
compilation
18- 19 I2 --- S/N Signal-to-noise ratio (3)
21- 24 I4 km/s cz Heliocentric velocity
26- 29 F4.1 Gyr tSSP ? SSP-equivalent age (G1)
31- 33 F3.1 Gyr E_tSSP ? Error on tSSP (upper limit)
35- 37 F3.1 Gyr e_tSSP ? Error on tSSP (lower limit)
39- 43 F5.2 [Sun] [Fe/H] ? Abundance [Fe/H]
45- 48 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H]
50- 54 F5.2 [Sun] [Mg/Fe] ? Abundance [Mg/Fe]
56- 59 F4.2 [Sun] e_[Mg/Fe] ? rms uncertainty on [Mg/Fe]
61- 65 F5.2 [Sun] [C/Fe] ? Abundance [C/Fe]
67- 70 F4.2 [Sun] e_[C/Fe] ? rms uncertainty on [C/Fe]
72- 76 F5.2 [Sun] [N/Fe] ? Abundance [N/Fe]
78- 81 F4.2 [Sun] e_[N/Fe] ? rms uncertainty on [N/Fe]
83- 87 F5.2 [Sun] [Ca/Fe] ? Abundance [Ca/Fe]
89- 92 F4.2 [Sun] e_[Ca/Fe] ? rms uncertainty on [Ca/Fe]
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Note (1): Note as follows:
a = Galaxy with emission lines
b = Other galaxy with failed EZ-AGES fits (see details in Appendix D)
Note (2): Luminosity based on the SDSS Petrosian magnitude and include the
corrections described in Section 2.2.
Note (3): S/N is per angstrom, averaged over 4400-5400Å in the rest frame
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Byte-by-byte Description of file: tablee3.dat
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Bytes Format Units Label Explanations
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1- 15 A15 --- Name Galaxy name (HHMMSS.s+DDMMSS) (1)
17- 21 F5.2 [solLum] logL Luminosity (2)
23- 27 F5.3 [km/s] log.sig ?=- Velocity dispersion from literature
compilation
29- 32 F4.1 Gyr tSSP ? SSP-equivalent age (G1)
34- 36 F3.1 Gyr E_tSSP ? Error on tSSP (upper limit)
38- 40 F3.1 Gyr e_tSSP ? Error on tSSP (lower limit)
42- 46 F5.2 [Sun] [Fe/H] ? Abundance [Fe/H]
48- 51 F4.2 [Sun] e_[Fe/H] ? rms uncertainty on [Fe/H]
53- 57 F5.2 [Sun] [Mg/Fe] ? Abundance [Mg/Fe]
59- 62 F4.2 [Sun] e_[Mg/Fe] ? rms uncertainty on [Mg/Fe]
64- 68 F5.2 [Sun] [C/Fe] ? Abundance [C/Fe]
70- 73 F4.2 [Sun] e_[C/Fe] ? rms uncertainty on [C/Fe]
75- 79 F5.2 [Sun] [N/Fe] ? Abundance [N/Fe]
81- 84 F4.2 [Sun] e_[N/Fe] ? rms uncertainty on [N/Fe]
86- 90 F5.2 [Sun] [Ca/Fe] ? Abundance [Ca/Fe]
92- 95 F4.2 [Sun] e_[Ca/Fe] ? rms uncertainty on [Ca/Fe]
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Note (1): NFP galaxies except 132350.3-313519.
Note (2): Luminosity based on the SDSS Petrosian magnitude and include the
corrections described in Section 2.2.
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Global Notes:
Note (G1): the age with the Simple Stellar Population model is estimated
from Hβ and metal lines as in Section 3.
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 17-Aug-2009