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. =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. ), 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 H{beta}, 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 H{beta}, 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 H{beta}, Mgb, fe5270, Fe5335 and the velocity dispersion sigma. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Note on tablea2.dat, tablea3.dat: ae is he distance along the major axis. -------------------------------------------------------------------------------- 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 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Seq Mehlert et al. (2000, Cat. , table1) number 4- 6 A3 --- --- [GMP] 8- 11 I4 --- GMP GMP number (Cat. ) 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) -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 2 I2 --- Seq Mehlert et al. (2000, Cat. , table1) number 4- 7 I4 --- GMP GMP number (Cat. ) 9- 12 A4 --- Type Morphological Type (from ) 14- 17 F4.2 0.1nm Hbeta Central (<0.1ae) H{beta} 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 -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea2.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 --- GMP GMP number (Cat. ) 6- 11 F6.3 --- DHbeta Gradient (inside 1ae) of H{beta} (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) -------------------------------------------------------------------------------- Note (1): All values are in dex/dex units. -------------------------------------------------------------------------------- Byte-by-byte Description of file: tablea3.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 4 I4 ----- GMP GMP number (Cat. ) 6- 10 F5.3 [0.1nm] logHbeta(ae) Fit value of log(H{beta}) 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) -------------------------------------------------------------------------------- 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. -------------------------------------------------------------------------------- Acknowledgements: Roberto Saglia ================================================================================ (End) Patricia Bauer [CDS] 22-Jul-2003