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J/MNRAS/381/1035   Spectroscopy in Shapley supercluster           (Smith+, 2007)

A deep AAOmega survey of low-luminosity galaxies in the Shapley supercluster: stellar population trends. Smith R.J., Lucey J.R., Hudson M.J. <Mon. Not. R. Astron. Soc., 381, 1035-1052 (2007)> =2007MNRAS.381.1035S
ADC_Keywords: Clusters, galaxy ; Galaxies, spectra ; Spectroscopy Keywords: galaxies: clusters: general - galaxies: elliptical and lenticular, cD - galaxies: evolution Abstract: We present new optical spectroscopy for 342 R<18 galaxies in the Shapley supercluster (and 198 supplementary galaxies), obtained from 8-h integrations with the AAOmega facility at the Anglo-Australian Telescope. We describe the observations and measurements of central velocity dispersion σ, emission-line equivalent widths and absorption-line indices. The distinguishing characteristic of the survey is its coverage of a very wide baseline in velocity dispersion (90 per cent range σ=40-230km/s), while achieving high signal-to-noise ratio throughout (median 60Å-1 at 5000Å). The data quality will enable estimates of Balmer-line ages to better than 20 per cent precision even for the faintest galaxies in the sample. Significant emission at Hα was detected in ∼30 per cent of the supercluster galaxies, including ∼20 per cent of red-sequence members. Using line-ratio diagnostics, we find that the emission is LINER (low ionization nuclear emission region) like at high luminosity, but driven by star formation in low-luminosity galaxies. To characterize the absorption lines, we use the classical Lick indices in the spectral range 4000-5200Å. We introduce a new method for applying resolution corrections to the line-strength indices. We define a subset of galaxies with very low emission contamination, based on the Hα line, and fit the index relations for this subset. The final sample analysed in this paper comprises 232 NFPS-selected galaxies meeting both the emission and the redshift criteria, of which 198 have measured velocity dispersions (i.e. are not unresolved). Description: Spectroscopic observations were made with the AAOmega system on the 3.9-m AAT, on the nights of 2006 April 26 and 29. AAOmega consists of the 2dF fibre positioner, linked to an efficient and stable bench-mounted dual-beam spectrograph. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file tables.dat 232 232 Basic data, principal and supplementary line-strength indices for the sample galaxies (tables 2, 3 and 4 of the paper)
See also: J/AJ/110/463 : Kinematics of the Shapley supercluster (Quintana+ 1995) J/A+AS/119/329 : VR photometry in the Shapley Supercluster (Slezak+, 1996) J/A+AS/120/357 : R magnitudes in four ESO fields (Infante+, 1996) J/other/PASA/16.113 : New structure in Shapley supercluster (Drinkwater+, 1999) J/MNRAS/312/540 : Redshift survey of intercluster galaxies (Bardelli+, 2000) J/AJ/130/2541 : Core of the Shapley supercluster at 1.4GHz (Miller+, 2005) J/A+A/445/819 : Systems of galaxies in Shapley supercluster (Ragone+, 2006) J/AJ/128/1558 : NOAO Fundamental Plane Survey (Smith+, 2004) Byte-by-byte Description of file: tables.dat
Bytes Format Units Label Explanations
1- 3 A3 --- --- [NFP] 4- 19 A16 --- NFP NFP galaxy designation (JHHMMSS.s+DDMMSS) 21- 23 I3 --- S/N Signal-to-noise ratio measured over a rest-frame interval of 4500-5500Å 25- 29 I5 km/s cz Heliocentric radial velocity 31- 35 F5.2 mag Rmag Total (Harris) R magnitude from NFPS photometry 37- 41 F5.2 mag Bmag Total (Harris) B magnitude from NFPS photometry 43- 47 F5.3 [km/s] logSv ? Velocity dispersion (2) (1) 49- 53 F5.3 [km/s] e_logSv ? rms uncertainty on logsigma 55- 59 F5.3 --- Mgb5177 Non-degenerate absorption-line index Mgb5177 (3) (2) 61- 65 F5.3 --- e_Mgb5177 rms uncertainty on Mgb5177 67- 71 F5.3 --- Fe5015 ?=- Non-degenerate absorption-line index Fe5015 (2) (3) 73- 77 F5.3 --- e_Fe5015 ?=- rms uncertainty on Fe5015 79- 84 F6.3 --- HgF ?=- Non-degenerate absorption-line index HgF (2) (3) 86- 90 F5.3 --- e_HgF ?=- rms uncertainty on HgF 92- 96 F5.2 --- HdA HdA line-strength index 98-101 F4.2 --- e_HdA rms uncertainty on HdA 103-107 F5.2 --- HdF HdF line-strength index 109-112 F4.2 --- e_HdF rms uncertainty on HdF 114-119 F6.3 --- CN1 CN1 line-strength index 121-125 F5.3 --- e_CN1 rms uncertainty on CN1 127-132 F6.3 --- CN2 CN2 line-strength index 134-138 F5.3 --- e_CN2 rms uncertainty on CN2 140-144 F5.2 --- Ca4227 Ca4227 line-strength index 146-149 F4.2 --- e_Ca4227 rms uncertainty on Ca4227 151-154 F4.2 --- G4300 G4300 line-strength index 156-159 F4.2 --- e_G4300 rms uncertainty on G4300 161-165 F5.2 --- HgA ?=- HgA line-strength index 167-170 F4.2 --- e_HgA ?=- rms uncertainty on HgA 172-175 F4.2 --- Fe4383 ?=- Fe4383 line-strength index 177-180 F4.2 --- e_Fe4383 ?=- rms uncertainty on Fe4383 182-185 F4.2 --- Ca4455 ?=- Ca4455 line-strength index 187-190 F4.2 --- e_Ca4455 ?=- rms uncertainty on Ca4455 192-196 F5.2 --- Fe4531 ?=- Fe4531 line-strength index 198-201 F4.2 --- e_Fe4531 ?=- rms uncertainty on Fe4531 203-206 F4.2 --- Fe4668 ?=- Fe4668 line-strength index 208-211 F4.2 --- e_Fe4668 ?=- rms uncertainty on Fe4668 213-216 F4.2 --- Hbeta Hβ line-strength index 218-221 F4.2 --- e_Hbeta rms uncertainty on Hbeta 223-227 F5.2 --- Fe5406 Fe5406 line-strength index 229-232 F4.2 --- e_Fe5406 rms uncertainty on Fe5406
Note (1): Galaxies with missing data in this column are those for which the dispersion was unresolved. Note (2): Velocity dispersions and line indices are as observed through a 142-140 aperture, corresponding to 1.9kpc in our adopted cosmology Note (3): Indices have been corrected to the Lick resolution and to zero intrinsic velocity broadening.
History: 20-Mar-2008: From electronic version of the journal 04-Mar-2009: magnitudes B and R were inverted, now corrected
(End) Patricia Vannier [CDS] 07-Feb-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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