2006A&A...448..983R

Query : 2006A&A...448..983R

2006A&A...448..983R - Astronomy and Astrophysics, volume 448983-999 (2006/3-4)

Dwarf elliptical galaxies in Centaurus A group: stellar populations in AM 1339-445 and AM 1343-452.

REJKUBA M., DA COSTA G.S., JERJEN H., ZOCCALI M. and BINGGELI B.

Abstract (from CDS):

We study the red giant populations of two dE galaxies, AM 1339-445 and AM 1343-452, with the aim of investigating the number and luminosity of any upper asymptotic giant branch (AGB) stars present. The galaxies are members of the Centaurus A group (D≃3.8Mpc) and are classified as outlying (R≃350kpc) satellites of Cen A. The analysis is based on near-IR photometry for individual red giant stars, derived from images obtained with ISAAC on the VLT. The photometry, along with optical data derived from WFPC2 images retrieved from the HST science archive, enable us to investigate the stellar populations of the dEs in the vicinity of the red giant branch (RGB) tip. In both systems we find stars above the RGB tip, which we interpret as intermediate-age upper-AGB stars. The presence of such stars is indicative of extended star formation in these dEs similar to that seen in many, but not all, dEs in the Local Group. For AM 1339-445, the brightest of the upper-AGB stars have Mbol≃-4.5 while those in AM 1343-452 have Mbol≃-4.8mag. These luminosities suggest ages of approximately 6.5±1 and 4±1Gyr as estimates for the epoch of the last episode of significant star formation in these systems. In both cases the number of upper-AGB stars suggests that ∼15% of the total stellar population is in the form of intermediate-age stars, considerably less than is the case for outlying dE satellites of the Milky Way such as Fornax and Leo I.

Abstract Copyright: ∼

Journal keyword(s): galaxies: dwarf - galaxies: stellar content - galaxies: evolution - stars: AGB and post-AGB

VizieR on-line data: <Available at CDS (J/A+A/448/983): table2.dat table3.dat>

Nomenclature: Table 2: [RDJ2006] AM 1339-445 NNNN N=275 among (Nos 226-5823). Table 3: [RDJ2006] AM 1343-452 NNNN N=190among (Nos 823-6234).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 43

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Number of rows : 43
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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 NGC 104 GlC 00 24 05.359 -72 04 53.20     4.09     ~ 4158 0
3 NAME Cetus Dwarf Galaxy G 00 26 10.8 -11 03 14     13.2     ~ 257 0
4 NGC 147 GiG 00 33 12.120 +48 30 31.46   12.0 9.5     ~ 720 1
5 NGC 185 Sy2 00 38 57.9400026024 +48 20 15.035874648   9.10 9.2     ~ 840 1
6 M 110 GiG 00 40 22.0572349992 +41 41 07.507220136   8.92 8.07     ~ 1370 1
7 M 32 GiG 00 42 41.82480 +40 51 54.6120 9.51 9.03 8.08     ~ 2236 2
8 M 31 AGN 00 42 44.330 +41 16 07.50 4.86 4.36 3.44     ~ 13622 1
9 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
10 IC 1613 GiC 01 04 48.4071 +02 07 10.185   10.42 10.01 9.77   ~ 1316 2
11 NAME Andromeda II G 01 16 29.8 +33 25 09     11.7     ~ 402 0
12 M 33 GiG 01 33 50.8965749232 +30 39 36.630403128 6.17 6.27 5.72     ~ 6226 1
13 MCG-06-07-001 G 02 39 59.3 -34 26 57   9.02 7.4     ~ 1894 1
14 NGC 1783 GlC 04 59 08.590 -65 59 15.84   10.9 10.93     ~ 273 0
15 NGC 1851 GlC 05 14 06.76 -40 02 47.6           ~ 1529 0
16 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
17 ESO 206-20A G 06 41 36.7 -50 57 58   22.14 11.0 19.47   ~ 1190 0
18 NAME F8D1 G 09 44 47.1 +67 26 19   14.60 13.85     ~ 80 0
19 NAME M 81-82 Group GrG 09 55 +69.1           ~ 758 0
20 LEDA 29231 G 10 04 40.3 +68 15 20   17.43 16.72     ~ 77 0
21 Z 64-73 G 10 08 28.12 +12 18 23.4   11.3 10.0     ~ 1284 1
22 Z 126-111 G 11 13 28.13 +22 09 10.1   12.9 12.0     ~ 899 0
23 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1582 2
24 NAME Cen A Group GrG 13 20 33.9 -44 58 51           ~ 274 0
25 NGC 5102 EmG 13 21 57.6100832352 -36 37 48.395156160   9.74 9.65 8.47 10.2 ~ 389 1
26 NAME Centaurus A BLL 13 25 27.61521044 -43 01 08.8050291   8.18 6.84 6.66   ~ 4774 3
27 LEDA 48515 G 13 42 05.7 -45 12 20   17.6       ~ 49 1
28 LEDA 166175 G 13 46 16.8 -45 41 05   19.2       ~ 37 1
29 M 4 GlC 16 23 35.22 -26 31 32.7           ~ 1978 0
30 M 107 GlC 16 32 31.86 -13 03 13.6           ~ 835 0
31 NGC 6528 GlC 18 04 49.61 -30 03 20.8   12.12 10.65     ~ 561 0
32 NGC 6553 GlC 18 09 15.68 -25 54 27.9   9.08       ~ 644 0
33 M 69 GlC 18 31 23.10 -32 20 53.1           ~ 492 0
34 NAME SDG G 18 55 19.0 -30 32 43   4.5 3.6     ~ 2438 2
35 M 55 GlC 19 39 59.71 -30 57 53.1     6.49     ~ 913 0
36 M 15 GlC 21 29 58.33 +12 10 01.2           ~ 3274 0
37 M 2 GlC 21 33 27.02 -00 49 23.7     6.25     ~ 1114 1
38 M 30 GlC 21 40 22.12 -23 10 47.5     7.10     ~ 1121 0
39 NAME Tuc Galaxy G 22 41 49.6 -64 25 10   15.7 15.2     ~ 324 0
40 NAME Pisces II G 22 58 31.0 +05 57 09     16.3     ~ 283 0
41 NAME Andromeda VII GiG 23 26 31.0 +50 40 33   13.6 11.8     ~ 222 1
42 NAME Peg dSph GiG 23 51 46.3 +24 34 57   14.5 13.2     ~ 250 2
43 NAME Local Group GrG ~ ~           ~ 9325 0

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