2005A&A...433..519Z


C.D.S. - SIMBAD4 rel 1.7 - 2021.03.06CET01:34:05

2005A&A...433..519Z - Astronomy and Astrophysics, volume 433, 519-530 (2005/4-2)

Kinematic and chemical evolution of early-type galaxies.

ZIEGLER B.L., THOMAS D., BOEHM A., BENDER R., FRITZ A. and MARASTON C.

Abstract (from CDS):

We investigate in detail 13 early-type field galaxies with 0.2<z<0.7 drawn from the Fors Deep Field. Since the majority (9 galaxies) is at z≃0.4, we compare the field galaxies to 22 members of three rich clusters with z=0.37 to explore possible variations caused by environmental effects. We exploit VLT/FORS spectra (R≃1200) and HST/ACS imaging to determine internal kinematics, structures and stellar population parameters. From the Faber-Jackson and Fundamental Plane scaling relations we deduce a modest luminosity evolution in the B-band of 0.3-0.5mag for both samples. We compare measured Lick absorption line strengths (Hδ, Hγ, Hβ, Mgb, and Fe5335) with evolutionary stellar population models to derive light-averaged ages, metallicities and the element abundance ratios Mg/Fe. We find that these three stellar parameters of the distant galaxies obey a scaling with velocity dispersion (mass) which is consistent with that of local nearby galaxies. In particular, the distribution of Mg/Fe ratios of local galaxies is matched by the distant ones, and their derived mean offset in age corresponds to the average lookback time. This indicates that there was little chemical enrichment and no significant star formation within the last ∼5Gyr. The calculated luminosity evolution of a simple stellar population model for the derived galaxy ages and lookback times is in most cases consistent with the mild brightening measured by the scaling relations.

Abstract Copyright:

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: abundances - galaxies: stellar content - galaxies: kinematics and dynamics - galaxies: distances and redshifts

Simbad objects: 22

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Number of rows : 22

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 FDF 1161 G 01 05 51.69 -25 45 46.0   23.41       ~ 3 0
2 FDF 4285 G 01 06 02.96 -25 44 55.8   23.19       ~ 4 0
3 NAME FDF reg 01 06 03.6 -25 45 46           ~ 122 0
4 FDF 5011 G 01 06 05.55 -25 48 48.9   24.84       ~ 4 0
5 2dFGRS TGS145Z025 G 01 06 08.80 -25 48 06.8   19.71   17.359   ~ 4 0
6 FDF 6307 G 01 06 10.21 -25 44 28.2   23.52       ~ 4 0
7 FDF 6338 G 01 06 10.33 -25 49 15.6   23.89       ~ 3 0
8 FDF 6336 G 01 06 10.33 -25 45 16.2   24.69       ~ 3 0
9 FDF 6439 G 01 06 10.67 -25 42 44.4   22.44       ~ 4 0
10 FDF 7116 G 01 06 12.96 -25 43 25.6   24.21       ~ 4 0
11 FDF 7459 G 01 06 14.17 -25 45 04.4   24.28       ~ 3 0
12 FDF 7796 G 01 06 15.43 -25 48 02.8   23.65       ~ 3 0
13 FDF 8372 G 01 06 17.55 -25 44 50.6   21.62       ~ 3 0
14 FDF 8626 G 01 06 18.71 -25 48 10.3   21.45       ~ 3 0
15 ACO 370 ClG 02 39 50.5 -01 35 08           ~ 650 0
16 * 39 Cnc * 08 40 06.4182331380 +20 00 28.033945888 8.20 7.37 6.39 5.67 5.20 G8+III-IIIb 176 0
17 * del Cnc ** 08 44 41.0992106 +18 09 15.503395 6.01 5.02 3.94 3.16 2.62 K0+IIIb 192 0
18 ClG 0949+44 ClG 09 52 58.3 +43 54 16     19.40     ~ 20 0
19 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4319 2
20 ClG J1514+3636 ClG 15 14 22.0 +36 36 22     19.0     ~ 136 0
21 HD 186478 Pe* 19 45 14.1410795461 -17 29 27.071420634   10.116 9.302 8.527 7.961 K2III 134 0
22 * d Cyg PM* 19 50 37.7237098 +52 59 16.790129 7.84 6.31 5.03     K3IIICN2 171 0

    Equat.    Gal    SGal    Ecl

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