2008MNRAS.385.1374M

Query : 2008MNRAS.385.1374M

2008MNRAS.385.1374M - Mon. Not. R. Astron. Soc., 385, 1374-1392 (2008/April-2)

The relation between stellar populations, structure and environment for dwarf elliptical galaxies from the MAGPOP-ITP.

MICHIELSEN D., BOSELLI A., CONSELICE C.J., TOLOBA E., WHILEY I.M., ARAGON-SALAMANCA A., BALCELLS M., CARDIEL N., CENARRO A.J., GORGAS J., PELETIER R.F. and VAZDEKIS A.

Abstract (from CDS):

Dwarf galaxies, as the most numerous type of galaxy, offer the potential to study galaxy formation and evolution in detail in the nearby universe. Although they seem to be simple systems at first view, they remain poorly understood. In an attempt to alleviate this situation, the MAGPOP EU Research and Training Network embarked on a study of dwarf galaxies named MAGPOP-ITP. In this paper, we present the analysis of a sample of 24 dwarf elliptical galaxies (dEs) in the Virgo cluster and in the field, using optical long-slit spectroscopy. We examine their stellar populations in combination with their light distribution and environment. We confirm and strengthen previous results that dEs are, on average, younger and more metal-poor than normal elliptical galaxies, and that their [α/Fe] abundance ratios scatter around solar. This is in accordance with the downsizing picture of galaxy formation where mass is the main driver for the star formation history. We also find new correlations between the luminosity-weighted mean age, the large-scale asymmetry, and the projected Virgocentric distance. We find that environment plays an important role in the termination of the star formation activity by ram-pressure stripping of the gas in short time-scales, and in the transformation of discy dwarfs to more spheroidal objects by harassment over longer time-scales. This points towards a continuing infalling scenario for the evolution of dEs.

Abstract Copyright: ©2008 The Authors. Journal compilation © 2008 RASL

Journal keyword(s): galaxies: dwarf - galaxies: evolution - galaxies: formation

Simbad objects: 46

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Number of rows : 46
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
2 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
3 LEDA 1007217 AG? 02 41 35.145 -08 10 24.33   15.96   14.96   ~ 15 0
4 2MASX J02420036+0000531 Sy1 02 42 00.369 +00 00 53.13           ~ 13 0
5 NGC 1407 rG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 613 2
6 * ups Gem PM* 07 35 55.3500141720 +26 53 44.680194960 7.54 5.60 4.06 2.82 1.91 M0III 212 0
7 HD 65900 * 08 01 13.8982828104 +04 52 47.522137476   5.647 5.640     A1V 81 0
8 HD 72184 SB* 08 32 54.9780716136 +38 00 58.944441348   7.01   5.2   K1.5III-IIIb 139 0
9 * ups02 Cnc PM* 08 33 00.1040583552 +24 05 05.259536556   7.373 6.340     G9III 154 0
10 * del Cnc ** 08 44 41.0991810454 +18 09 15.509048595 6.01 5.02 3.94 3.16 2.62 K0+IIIb 212 0
11 HD 74377 PM* 08 45 10.3964048108 +41 40 18.605049150   9.48 8.55 8.0   K3V 102 0
12 * rho01 Cnc PM* 08 52 35.8111044043 +28 19 50.954994470 7.45 6.82   5.4   K0IV-V 1223 1
13 * phi UMa ** 09 52 06.35437 +54 03 51.5962   4.602 4.557     A3IV 160 0
14 NGC 3073 EmG 10 00 52.0678224264 +55 37 07.881619152 14.12 14.07 13.40     ~ 201 2
15 IC 3025 GiG 12 10 23.189 +10 11 18.62   15.3       ~ 84 0
16 IC 3131 AG? 12 18 50.9006616648 +07 51 43.066744308   14.8       ~ 74 0
17 Z 42-31 GiG 12 20 12.1876857240 +06 37 23.506336596   15.4       ~ 36 0
18 NGC 4305 GiP 12 22 03.6061412616 +12 44 27.305742948   13.8       ~ 126 0
19 NGC 4306 GiP 12 22 04.087 +12 47 13.96   14.4       ~ 113 0
20 IC 3328 GiP 12 25 57.9238048368 +10 03 13.552350912   14.9       ~ 172 0
21 IC 3344 GiG 12 26 32.3896963032 +13 34 43.544246304   15.2       ~ 66 0
22 IC 3369 GiG 12 27 16.9345517640 +16 01 28.169699412   15.1       ~ 58 0
23 IC 3381 LSB 12 28 14.8698618648 +11 47 23.359165728   14.42       ~ 173 1
24 IC 3393 GiG 12 28 41.7047406696 +12 54 57.265958916   14.85 14.24   13.19 ~ 117 1
25 IC 3413 GiG 12 29 22.5171098280 +11 26 01.955382504   15.2       ~ 82 0
26 NGC 4482 GiG 12 30 10.3245430152 +10 46 46.088237784   14.2       ~ 182 0
27 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
28 M 87 AGN 12 30 49.42338414 +12 23 28.0436859 10.16 9.59 8.63   7.49 ~ 7815 3
29 IC 3470 GiP 12 32 23.353 +11 15 47.56   15.0       ~ 125 0
30 IC 3510 GiG 12 34 14.8201884552 +11 04 17.432673708   15.2       ~ 66 0
31 IC 3586 GiG 12 36 54.858 +12 31 12.49   15.3       ~ 114 0
32 IC 3652 GiG 12 40 58.5602846328 +11 11 04.080925212   15.1       ~ 127 0
33 IC 809 GiG 12 42 08.6673855720 +11 45 15.438923748   15.1       ~ 118 0
34 IC 810 GiG 12 42 09.0797376720 +12 35 48.515221536   14.7     12.2 ~ 60 0
35 Z 43-3 GiG 12 42 56.3359175976 +03 40 35.752436760   15.1       ~ 54 0
36 Z 46-45 AG? 14 04 15.8435637792 +04 06 43.884701280   14.10       ~ 36 1
37 Z 20-39 GiG 14 58 48.7186892424 +02 01 24.710276208   14.9   13.02   ~ 32 0
38 NGC 5870 AG? 15 06 33.827 +55 28 45.08   14.89       ~ 23 1
39 * tau01 Ser * 15 25 47.3973646296 +15 25 40.930863888 8.78 6.83 5.17     M1III 90 0
40 * chi Ser a2* 15 41 47.4147355608 +12 50 51.093705840 5.42 5.37 5.33 5.28 5.32 A2VpMnEu(Sr) 194 0
41 * rho CrB PM* 16 01 02.6604891411 +33 18 12.639472357   6.01   5.0   G0+VaFe-1 686 1
42 V* AT CrB BY* 16 06 29.5992526286 +38 37 56.065088402   9.57   8.0   K3V 129 0
43 HD 148513 PM* 16 28 33.9807973104 +00 39 54.001143144 8.65 6.85 5.39     K3V 170 0
44 * b Her SB* 18 07 01.5906608928 +30 33 43.584892488 5.52 5.67 5.13 4.61 4.28 F6V 493 0
45 * 71 Oph * 18 07 18.3593981592 +08 44 01.922061912   5.592 4.640     G8III 182 0
46 NAME Local Group GrG ~ ~           ~ 9325 0

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