2001AJ....121.1974R

Query : 2001AJ....121.1974R

2001AJ....121.1974R - Astron. J., 121, 1974-1991 (2001/April-0)

Ages and metallicities of Fornax dwarf elliptical galaxies.

RAKOS K., SCHOMBERT J., MAITZEN H.M., PRUGOVECKI S. and ODELL A.

Abstract (from CDS):

Narrowband photometry is presented on 27 dwarf ellipticals in the Fornax cluster. Calibrated with Galactic globular cluster data and spectrophotometric population models, the colors indicated that dwarf ellipticals have a mean [Fe/H] of -1.00±0.28 ranging from -1.6 to -0.4. The mean age of dwarf ellipticals, also determined photometrically, is estimated at 10±1 Gyr compared with 13 Gyr for bright Fornax ellipticals. Comparison of our metallicity color and Mg2 indices demonstrates that the [Mg/Fe] ratio is lower in dwarf ellipticals than their more massive cousins, which is consistent with a longer duration of initial star formation to explain their younger ages. There is a increase in dwarf metallicity with distance from the Fornax cluster center, where core galaxies are on average 0.5 dex more metal-poor than halo dwarfs. In addition, we find the halo dwarfs are younger in mean age compared with core dwarfs. One possible explanation is that the intracluster medium ram pressure strips the gas from dwarf ellipticals, halting star formation (old age) and stopping enrichment (low metallicity) as they enter the core.

Abstract Copyright: ∼

Journal keyword(s): Galaxies: Dwarf - Galaxies: Elliptical and Lenticular, cD - Galaxies: Evolution - Galaxies: Stellar Content

Simbad objects: 71

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Number of rows : 71
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 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
2 NGC 288 GlC 00 52 45.24 -26 34 57.4   10 8.13     ~ 1130 0
3 NGC 362 GlC 01 03 14.26 -70 50 55.6     6.58     ~ 1167 0
4 LEDA 74617 GiC 03 30 46.21 -35 32 57.9   15.96       ~ 27 0
5 6dFGS gJ033312.8-360103 GiC 03 33 12.83 -36 01 02.4   15.85       ~ 30 0
6 LEDA 74737 LSB 03 34 20.2 -35 21 45   17.5       ~ 23 0
7 MCG-06-08-027 EmG 03 34 29.4927803424 -35 32 47.329271916   14.50       ~ 95 1
8 LEDA 13242 LSB 03 34 44.2 -35 51 41   16.9       ~ 24 0
9 2MASX J03352407-3621496 GiC 03 35 24.0910651464 -36 21 49.743672768   15.90       ~ 38 0
10 LEDA 74757 LSB 03 35 42.8 -35 30 51   18.3 18.85     ~ 19 0
11 LEDA 74761 LSB 03 36 03.94 -35 23 20.5   17.7 17.34     ~ 27 1
12 LEDA 74778 GiC 03 36 48.6 -34 16 48   17.2       ~ 21 0
13 LEDA 74781 GiC 03 36 53.21 -34 56 17.3   16.93       ~ 30 0
14 6dFGS gJ033704.6-353524 GiC 03 37 04.66 -35 35 24.0   15.94   15.65   ~ 51 0
15 LEDA 74786 GiC 03 37 08.2 -34 43 52   18.8       ~ 20 0
16 LEDA 74791 GiC 03 37 23.41 -34 54 00.1   16.51       ~ 32 0
17 NGC 1396 GiG 03 38 06.5677454520 -35 26 23.637846372   14.80       ~ 105 1
18 ESO 358-42 GiC 03 38 09.1644279912 -34 31 07.380761484   15.74   14.44   ~ 67 1
19 LEDA 74808 EmG 03 38 19.265 -35 07 44.74   15.60 15.34     ~ 65 0
20 LEDA 74811 EmG 03 38 21.4890668040 -35 15 34.953195492   15.89 15.65     ~ 42 0
21 NGC 1399 rG 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1636 1
22 ACO S 373 ClG 03 38 29.4 -35 27 08           ~ 2029 0
23 LEDA 13449 GiC 03 39 13.42 -35 22 15.7   15.1 14.91     ~ 68 1
24 LEDA 13452 GiC 03 39 19.60 -35 43 29.0   16.10 15.89     ~ 49 1
25 LEDA 74859 GiC 03 40 01.30 -34 45 28.5   16.85       ~ 27 0
26 LEDA 74860 LSB 03 40 04.7 -34 10 04   18.4       ~ 20 0
27 LEDA 74879 GiC 03 40 33.86 -35 01 21.4   15.73   15.54   ~ 46 0
28 2MASX J03414141-3510119 GiC 03 41 41.410 -35 10 11.99   15.70       ~ 41 1
29 LEDA 74933 GiC 03 42 17.2756218024 -35 32 26.556690480   16.26 16.31     ~ 41 0
30 LEDA 74965 LSB 03 44 25.1 -35 51 24   17.6       ~ 18 0
31 6dFGS gJ034432.9-351146 GiC 03 44 32.94 -35 11 44.8   15.90       ~ 30 0
32 LEDA 74970 GiC 03 44 44.4004984152 -35 41 01.444886628   16.10       ~ 25 0
33 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
34 M 79 GlC 05 24 10.59 -24 31 27.3     8.16     ~ 883 0
35 NGC 3201 GlC 10 17 36.82 -46 24 44.9           ~ 1001 0
36 NGC 4147 GlC 12 10 06.149 +18 32 31.78   11.45 10.74     ~ 616 0
37 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 327 0
38 M 68 GlC 12 39 27.98 -26 44 38.6     7.96     ~ 1069 0
39 NGC 4833 GlC 12 59 33.92 -70 52 35.4           ~ 467 0
40 M 53 GlC 13 12 55.25 +18 10 05.4     7.79     ~ 907 0
41 NGC 5053 GlC 13 16 27.09 +17 42 00.9     9.96     ~ 675 0
42 NGC 5139 GlC 13 26 47.28 -47 28 46.1           ~ 3677 0
43 M 3 GlC 13 42 11.62 +28 22 38.2     6.39     ~ 2593 0
44 NGC 5286 GlC 13 46 26.81 -51 22 27.3           ~ 485 0
45 NGC 5466 GlC 14 05 27.29 +28 32 04.0     9.70     ~ 887 0
46 NGC 5634 GlC 14 29 37.28 -05 58 35.1   10.69 10.05     ~ 333 0
47 NGC 5897 GlC 15 17 24.40 -21 00 36.4   10.16 8.52     ~ 424 0
48 M 5 GlC 15 18 33.22 +02 04 51.7     5.95     ~ 2095 0
49 NGC 5986 GlC 15 46 03.00 -37 47 11.1     6.92     ~ 408 0
50 NGC 6101 GlC 16 25 48.12 -72 12 07.9           ~ 337 0
51 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
52 M 13 GlC 16 41 41.634 +36 27 40.75     5.8     ~ 2291 0
53 NGC 6229 GlC 16 46 58.641 +47 31 36.38   9.38 9.86     ~ 397 0
54 M 12 GlC 16 47 14.18 -01 56 54.7     6.07     ~ 736 0
55 M 10 GlC 16 57 09.05 -04 06 01.1     4.98     ~ 857 0
56 NGC 6352 GlC 17 25 29.11 -48 25 19.8           ~ 425 0
57 NGC 6397 GlC 17 40 42.09 -53 40 27.6     5.17     ~ 2103 0
58 NGC 6584 GlC 18 18 37.60 -52 12 56.8     8.17     ~ 317 0
59 NGC 6652 GlC 18 35 45.63 -32 59 26.6           ~ 474 0
60 M 22 GlC 18 36 23.94 -23 54 17.1           ~ 1459 0
61 M 70 GlC 18 43 12.76 -32 17 31.6           ~ 421 0
62 M 54 GlC 18 55 03.33 -30 28 47.5           ~ 1164 0
63 NGC 6723 GlC 18 59 33.15 -36 37 56.1           ~ 543 0
64 NGC 6752 GlC 19 10 52.11 -59 59 04.4           ~ 2121 0
65 NGC 6760 GlC 19 11 12.06 +01 01 49.7   11.37 9.78     ~ 264 0
66 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
67 M 75 GlC 20 06 04.841 -21 55 20.14     8.26     ~ 394 0
68 M 72 GlC 20 53 27.70 -12 32 14.3     8.96     ~ 465 0
69 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
70 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
71 NAME Local Group GrG ~ ~           ~ 9325 0

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