J/A+A/407/423 Coma cluster early-type galaxies. III. (Mehlert+, 2003)
Spatially resolved spectroscopy of Coma cluster early-type galaxies:
III. The stellar population gradients.
Mehlert D., Thomas D., Saglia R.P., Bender R., Wegner G.
<Astron. Astrophys. 407, 423 (2003)>
=2003A&A...407..423M 2003A&A...407..423M
ADC_Keywords: Clusters, galaxy ; Spectroscopy
Keywords: galaxies: clusters: individual: Coma -
galaxies: elliptical and lenticular, cD - galaxies: stellar content
Abstract:
Based on Paper I of this series (Mehlert et al., 2000, Cat.
J/A+AS/141/449), we derive central values and logarithmic gradients
for the Hbeta, Mg and Fe indices of 35 early-type galaxies in the Coma
cluster. We find that pure elliptical galaxies have on average
slightly higher velocity dispersions, lower Hbeta, and higher metallic
line-strengths than galaxies with disks (S0).
Description:
Table A1 (tablea1.dat) gives the central values (averaged over
a<0.1ae, where ae is the distance along the major axis, along the
major axis) of the indices Hβ, Mgb, Fe5270, Fe5335 and of the
velocity dispersion sigma.
Table A2 (tablea2.dat gives the fitted logarithmic gradients inside
a<1ae along the major axis of the indices Hβ, Mgb, Fe5270, Fe5335
and the velocity dispersion sigma.
Table A3 (tablea3.dat) gives the logarithmic fit value at 1ae along
the major axis of the indices Hβ, Mgb, fe5270, Fe5335 and the
velocity dispersion sigma.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
position.dat 48 35 Positions, from Simbad
tablea1.dat 65 35 Central values of the line indices and sigma
tablea2.dat 71 35 *Fitted Logarithmic gradients inside a<1ae of the
line indices and sigma
tablea3.dat 66 35 *Logarithmic fit values at 1ae of the line
indices and sigma
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Note on tablea2.dat, tablea3.dat: ae is he distance along the major axis.
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See also:
VII/42 : GMP catalogue: galaxies in the Coma cluster (Godwin+ 1983)
J/A+AS/141/449 : Coma cluster early-type galaxies (Mehlert+, 2000)
J/A+A/395/753 : Spectroscopy of Coma early-type galaxies. II. (Wegner+, 2002)
Byte-by-byte Description of file: position.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Mehlert et al. (2000, Cat. J/A+AS/141/449,
table1) number
4- 6 A3 --- --- [GMP]
8- 11 I4 --- GMP GMP number (Cat. VII/42)
13 A1 --- --- [=]
15- 27 A13 --- Name Other name
30- 31 I2 h RAh Right ascension (J2000.0)
33- 34 I2 min RAm Right ascension (J2000.0)
36- 37 I2 s RAs Right ascension (J2000.0)
39 A1 --- DE- Declination sign (J2000.0)
40- 41 I2 deg DEd Declination (J2000.0)
43- 46 F4.1 arcmin DEm Declination (J2000.0)
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Seq Mehlert et al. (2000, Cat. J/A+AS/141/449,
table1) number
4- 7 I4 --- GMP GMP number (Cat. VII/42)
9- 12 A4 --- Type Morphological Type (from J/A+AS/141/449)
14- 17 F4.2 0.1nm Hbeta Central (<0.1ae) Hβ absorption index (G1)
19- 22 F4.2 0.1nm e_Hbeta Error on Hbeta
24- 27 F4.2 0.1nm Mgb Central (<0.1ae) Mgb absorption index (G1)
29- 32 F4.2 0.1nm e_Mgb Error on Mgb
34- 37 F4.2 0.1nm Fe5270 Central (<0.1ae) Fe5270 absorption index (G1)
39- 42 F4.2 0.1nm e_Fe5270 Error on Fe5270
44- 47 F4.2 0.1nm Fe5335 Central (<0.1ae) Fe5335 absorption index (G1)
49- 52 F4.2 0.1nm e_Fe5335 Error on Fe5335
54- 58 F5.1 km/s sigma Central (<0.1ae) velocity dispersion (G1)
60- 62 F3.1 km/s e_sigma Error on sigma
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- GMP GMP number (Cat. VII/42)
6- 11 F6.3 --- DHbeta Gradient (inside 1ae) of Hβ (G1) (1)
13- 17 F5.3 --- e_DHbeta Error on DHbeta (1)
19- 24 F6.3 --- DMgb Gradient (inside 1ae) of Mgb (G1) (1)
26- 30 F5.3 --- e_DMgb Error on DMgb (1)
32- 37 F6.3 --- DFe5270 Gradient (inside 1ae) of Fe5270 (G1) (1)
39- 43 F5.3 --- e_DFe5270 Error on DFe5270 (1)
45- 50 F6.3 --- DFe5335 Gradient (inside 1ae) of Fe5335 (G1) (1)
52- 56 F5.3 --- e_DFe5335 Error on DFe5335 (1)
58- 63 F6.3 --- Dsigma Gradient (inside 1ae) of velocity dispersion
(G1) (1)
65- 69 F5.3 --- e_Dsigma Error on Dsigma (1)
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Note (1): All values are in dex/dex units.
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 ----- GMP GMP number (Cat. VII/42)
6- 10 F5.3 [0.1nm] logHbeta(ae) Fit value of log(Hβ) at 1ae (G1)
12- 16 F5.3 [0.1nm] e_logHbeta(ae) Error on logHbeta(ae)
18- 22 F5.3 [0.1nm] logMgb(ae) Fit value of log(Mgb) at 1ae (G1)
24- 28 F5.3 [0.1nm] e_logMgb(ae) Error on logMgb(ae)
30- 34 F5.3 [0.1nm] logFe5270(ae) Fit value of of log(Fe5270) at 1ae (G1)
36- 40 F5.3 [0.1nm] e_logFe5270(ae) Error on logFe5270(ae)
42- 46 F5.3 [0.1nm] logFe5335(ae) Fit value of log(Fe5335) at 1ae (G1)
48- 52 F5.3 [0.1nm] e_logFe5335(ae) Error on logFe5335(ae)
54- 58 F5.3 [km/s] logsigma(ae) Fit value of log(velocity dispersion)
at 1ae (G1)
60- 64 F5.3 [km/s] e_logsigma(ae) Error on logsigma(ae)
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Global notes:
Note (G1): ae = re/sqrt(1-epsilon), is the distance along the major axis,
that corresponds to the effective radius re of the galaxy with
ellipticity epsilon.
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Acknowledgements: Roberto Saglia
(End) Patricia Bauer [CDS] 22-Jul-2003