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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
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:
FileName Lrecl Records Explanations
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
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).
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
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: tablee2.dat
Bytes Format Units Label Explanations
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]
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
Byte-by-byte Description of file: tablee3.dat
Bytes Format Units Label Explanations
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]
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.
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
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