J/AJ/126/2268 Velocity dispersions and Mg2 index of galaxies (Wegner+, 2003)
Redshift-distance survey of early-type galaxies: spectroscopic data.
Wegner G., Bernardi M., Willmer C.N.A., Da Costa L.N., Alonso M.V.,
Pellegrini P.S., Maia M.A.G., Chaves O.L., Rite C.
<Astron. J., 126, 2268-2280 (2003)>
=2003AJ....126.2268W 2003AJ....126.2268W
ADC_Keywords: Galaxies, spectra ; Velocity dispersion ; Redshifts ; Abundances
Keywords: galaxies: distances and redshifts -
galaxies: elliptical and lenticular, cD - galaxies: general -
large-scale structure of universe - surveys -
techniques: spectroscopic
Abstract:
We present central velocity dispersions and Mg2 line indices for an
all-sky sample of 1175 elliptical and S0 galaxies, of which 984 had no
previous measures. This sample contains the largest set of homogeneous
spectroscopic data for a uniform sample of elliptical galaxies in the
nearby universe. These galaxies were observed as part of the ENEAR
(Redshift-Distance Survey of Nearby Early-Type Galaxies) project,
designed to study the peculiar motions and internal properties of the
local early-type galaxies. Using 523 repeated observations of 317
galaxies obtained during different runs, the data are brought to a
common zero point. These multiple observations, taken during the many
runs and different instrumental setups employed for this project, are
used to derive statistical corrections to the data and are found to be
relatively small, typically ≲5% of the velocity dispersion and
0.01mag in the Mg2 line strength. Typical errors are about 8% in
velocity dispersion and 0.01mag in Mg2, in good agreement with
values published elsewhere.
Description:
The spectroscopic observations reported here were made over several
years from three sites (Complejo Astronomico El Leoncit, Argentina
(CASLEO), ESO, Chile, and MDM Observatory, Arizona). During our
program 30 spectroscopic observing runs were carried out at the
different sites. In total, there were 127 usable nights for
spectroscopic observations in the period 1992-1999. Eleven setups were
employed corresponding to different combinations of telescope,
detector, and spectrograph, and the resolution varied from about
2 to 5Å. A total of 1701 spectra were obtained. Table 1 summarizes
the observations listing.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 30 29 Observing runs for spectroscopy
table4.dat 91 1175 The Spectroscopic ENEAR Catalog
table5.dat 81 1699 Individual ENEAR Spectroscopic Measurements
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See also:
J/AJ/125/2307 : Rc photometry of ENEAR survey galaxies (Alonso+, 2003)
J/MNRAS/305/259 : EFAR galaxies redshifts + velocity dispersions (Wegner+ 1999)
J/A+A/395/431 : Line-strength indices of 148 early-type gal. (Beuing+, 2002)
J/A+AS/113/151 : Velocity dispersions for elliptical galaxies (Di Nella+ 1995)
J/ApJ/368/54 : Velocities and Photometry for E and S0 gal. (Dressler+ 1991)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Run Spectrocopic observation run code
13- 24 A12 --- Date Observation date
26- 27 I2 --- Nspec Number of spectroscopic nights for the run
29- 30 I2 --- Setup Setup reference number
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Standard galaxy name
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 24 F4.1 s RAs Second of Right Ascension (J2000)
26 A1 --- DE- Sign of the Declination (J2000)
27- 28 I2 deg DEd Degree of Declination (J2000)
30- 31 I2 arcmin DEm Arcminute of Declination (J2000)
33- 34 I2 arcsec DEs Arcsecond of Declination (J2000)
36- 37 I2 --- MType Morphological parameter (see Paper I)
39- 43 F5.2 mag Bmag The photographic magnitude
45- 46 I2 --- o_cz Number of observations for cz
48- 52 I5 km/s cz Heliocentric redshift
54- 55 I2 km/s e_cz Error in cz
57- 61 F5.3 [km/s] Sigma Log of the velocity dispersion
63- 67 F5.3 [km/s] e_Sigma Error in log Sigma
69- 70 I2 --- o_Mg2 Number of spectra used for Mg2
72- 76 F5.3 mag Mg2 The Mg2 line index
78- 82 F5.3 mag e_Mg2 Error in Mg2
84- 87 A4 --- n_Name Additional notes on Name (1)
89 A1 --- Lit [*] Indicates data in the literature
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Note (1): Additional notes are numbered as follows:
1 = no problems;
2 = star along the slit;
3 = emission lines;
4 = low S/N measurements;
5 = low velocity dispersion on the limit of the resolution;
6 = old data (Reticon);
7 = peculiar spectrum: eg. broad lines (supernova?), absorption
lines too weak or undetectable.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- Name Standard galaxy name
15- 16 I2 h RAh Hour of Right Ascension (J2000)
18- 19 I2 min RAm Minute of Right Ascension (J2000)
21- 24 F4.1 s RAs Second of Right Ascension (J2000)
26 A1 --- DE- Sign of the Declination (J2000)
27- 28 I2 deg DEd Degree of Declination (J2000)
30- 31 I2 arcmin DEm Arcminute of Declination (J2000)
33- 34 I2 arcsec DEs Arcsecond of Declination (J2000)
36- 37 I2 --- MType Morphological parameter (see Paper I,
da Costa et al., 2000AJ....120...95D 2000AJ....120...95D)
39- 43 F5.2 mag Bmag The photographic magnitude
45- 47 I3 --- Run Spectrocopic observation run code (1)
49- 53 I5 km/s cz Heliocentric redshift
55- 56 I2 km/s e_cz Error in cz
58- 62 F5.3 [km/s] Sigma Log of the velocity dispersion
64- 68 F5.3 [km/s] e_Sigma Error in log Sigma
70- 74 F5.3 --- Mg2 The Mg2 line index
76- 80 F5.3 --- e_Mg2 Error in Mg2
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Note (1): See table1.dat for details
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History:
From electronic version of the journal
References:
da Costa et al., Paper I 2000AJ....120...95D 2000AJ....120...95D
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 12-Jan-2004