2008A&A...486...85C

Query : 2008A&A...486...85C

2008A&A...486...85C - Astronomy and Astrophysics, volume 48685-97 (2008/7-4)

Kinematics and stellar populations of low-luminosity early-type galaxies in the Abell 496 cluster.

CHILINGARIAN I.V., CAYATTE V., DURRET F., ADAMI C., BALKOWSKI C., CHEMIN L., LAGANA T.F. and PRUGNIEL P.

Abstract (from CDS):

The morphology and stellar populations of low-luminosity early-type galaxies in clusters have until now been limited to a few relatively nearby clusters such as Virgo or Fornax. Scenarii for the formation and evolution of dwarf galaxies in clusters are therefore not well constrained. We investigate here the morphology and stellar populations of low-luminosity galaxies in the relaxed richness class 1 cluster Abell 496 (z=0.0330). Deep multiband imaging obtained with the CFHT Megacam allowed us to select a sample of faint galaxies, defined here as objects with magnitudes 18<r'<22mag within a 1.2 arcsec fibre (-18.8<MB←15.1mag). We observed 118 galaxies spectroscopically with the ESO VLT FLAMES/Giraffe spectrograph with a resolving power R=6300. We present structural analysis and colour maps for the 48 galaxies belonging to the cluster. We fit the spectra of 46 objects with PEGASE.HR synthetic spectra to estimate the ages, metallicities, and velocity dispersions. We estimated possible biases by similarly analysing spectra of ∼1200 early-type galaxies from the Sloan Digital Sky Survey Data Release 6 (SDSS DR6). We computed values of α/Fe abundance ratios from the measurements of Lick indices. We briefly discuss effects of the fixed aperture size on the measurements. For the first time, high-precision estimates of stellar population properties have been obtained for a large sample of faint galaxies in a cluster, allowing for the extension of relations between stellar populations and internal kinematics to the low-velocity dispersion regime. We have revealed a peculiar population of elliptical galaxies in the core of the cluster, resembling massive early-type galaxies by their stellar population properties and velocity dispersions, but having luminosities of about 2mag fainter. External mechanisms of gas removal (ram pressure stripping and gravitational harassment) are more likely to have occurred than internal mechanisms such as supernova-driven winds. The violent tidal stripping of intermediate-luminosity, early-type galaxies in the cluster core can explain the properties of the peculiar elliptical galaxies surrounding the cD galaxy.

Abstract Copyright: ∼

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: dwarf - galaxies: clusters: individual: Abell 496 - galaxies: kinematics and dynamics - galaxies: stellar content - galaxies: fundamental parameters

VizieR on-line data: <Available at CDS (J/A+A/486/85): tablea1.dat tablea2.dat tablea3.dat>

Nomenclature: Figs A1-A48, Table A1: [CCD2008] G-NN (Nos G-01 to G-46), [CCD2008] G-AN (Nos G-A1, G-A2) = [CCD2008] ACO 496 JHHMMSS.ss+DDMMSS.s N=48.

Simbad objects: 56

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Number of rows : 56
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 LEDA 93391 GiC 04 33 06.9 -13 12 38   18.12       ~ 10 0
3 2MASX J04330883-1302354 GiC 04 33 08.8355583504 -13 02 35.451947724   17.41       ~ 11 0
4 [CCD2008] ACO 496 J043312.08-130449.3 GiC 04 33 12.100 -13 04 49.51           ~ 3 0
5 [CCD2008] ACO 496 J043317.75-131536.6 GiC 04 33 17.757 -13 15 36.87     19.76     ~ 5 0
6 [CCD2008] ACO 496 J043318.95-131726.9 GiC 04 33 18.93 -13 17 27.4     21.74     ~ 7 0
7 2MASX J04332033-1303144 GiC 04 33 20.3481092592 -13 03 14.856315300           ~ 10 0
8 [CCD2008] ACO 496 J043321.37-130416.6 GiC 04 33 21.36 -13 04 16.6           ~ 5 0
9 [CCD2008] ACO 496 J043324.61-131111.9 GiC 04 33 24.640 -13 11 12.47     20.69     ~ 4 0
10 LEDA 93403 GiC 04 33 24.8 -13 13 42     18.91     ~ 11 0
11 [CCD2008] ACO 496 J043325.10-130906.6 GiC 04 33 25.120 -13 09 07.03           ~ 3 0
12 [CCD2008] ACO 496 J043325.40-131414.6 GiC 04 33 25.397 -13 14 14.73           ~ 3 0
13 [CCD2008] ACO 496 J043325.54-130408.0 GiC 04 33 25.571 -13 04 08.11           ~ 3 0
14 [CCD2008] ACO 496 J043326.49-131717.8 GiC 04 33 26.53 -13 17 17.6     19.50     ~ 8 0
15 [CCD2008] ACO 496 J043329.79-130851.7 GiC 04 33 29.792 -13 08 52.01           ~ 3 0
16 LEDA 93409 GiC 04 33 31.4 -13 16 54     18.00     ~ 11 0
17 LEDA 93410 GiC 04 33 32.0 -13 15 18     17.90     ~ 10 0
18 2MASX J04333318-1317120 GiC 04 33 33.1750538664 -13 17 12.555603276           ~ 8 0
19 LEDA 93412 GiC 04 33 33.5 -13 18 52   17.03 17.81     ~ 12 0
20 [CCD2008] ACO 496 J043334.54-131137.1 GiC 04 33 34.537 -13 11 37.62           ~ 3 0
21 LEDA 3084811 GiC 04 33 37.3 -13 15 18           ~ 15 0
22 [CCD2008] ACO 496 J043338.22-131500.7 GiC 04 33 38.22 -13 15 00.7           ~ 3 0
23 [CCD2008] ACO 496 J043339.07-131319.7 GiC 04 33 39.07 -13 13 19.7           ~ 2 0
24 [CCD2008] ACO 496 J043339.72-131424.6 GiC 04 33 39.71 -13 14 22.8     19.99     ~ 4 0
25 ACO 496 ClG 04 33 40.8 -13 14 34           ~ 728 2
26 2MASX J04334167-1315520 GiC 04 33 41.7073397256 -13 15 51.706548576           ~ 5 0
27 [CCD2008] ACO 496 J043342.10-131653.7 GiC 04 33 42.10 -13 16 53.7     18.10     ~ 9 0
28 [CCD2008] ACO 496 J043342.13-131258.8 GiC 04 33 42.158 -13 12 59.08     20.10     ~ 5 0
29 LEDA 93421 GiC 04 33 42.7 -13 08 47   17.90 17.99     ~ 13 0
30 LEDA 93422 GiC 04 33 43.0 -13 05 16           ~ 7 0
31 [CCD2008] ACO 496 J043343.04-125924.4 GiC 04 33 43.060 -12 59 24.61           ~ 3 0
32 LEDA 93424 GiC 04 33 45.5 -13 05 41           ~ 9 0
33 LEDA 93425 GiC 04 33 46.5 -13 17 55   17.47       ~ 13 0
34 [CCD2008] ACO 496 J043348.59-130558.3 GiC 04 33 48.606 -13 05 58.58           ~ 3 0
35 LEDA 93428 GiC 04 33 48.9 -13 05 20           ~ 9 0
36 [CCD2008] ACO 496 J043350.17-125945.4 GiC 04 33 50.193 -12 59 46.26           ~ 3 0
37 [CCD2008] ACO 496 J043351.54-131135.5 GiC 04 33 51.554 -13 11 35.98           ~ 3 0
38 LEDA 93429 GiC 04 33 52.7 -13 15 23     18.20     ~ 11 0
39 [CCD2008] ACO 496 J043355.55-131024.9 GiC 04 33 55.551 -13 10 25.15           ~ 3 0
40 [CCD2008] ACO 496 J043356.18-125913.1 GiC 04 33 56.22 -12 59 13.8           ~ 4 0
41 LEDA 93433 GiC 04 33 59.1 -13 06 27           ~ 9 0
42 LEDA 93434 GiC 04 34 01.5 -13 14 01     17.41     ~ 9 0
43 2MASX J04340316-1313109 GiC 04 34 03.1904133552 -13 13 10.787099772   17.79       ~ 12 0
44 [CCD2008] ACO 496 J043408.50-131152.7 GiC 04 34 08.494 -13 11 52.77           ~ 3 0
45 [CCD2008] ACO 496 J043410.60-130756.7 GiC 04 34 10.575 -13 07 56.93           ~ 5 0
46 [CCD2008] ACO 496 J043411.72-131130.2 GiC 04 34 11.72 -13 11 30.2           ~ 1 0
47 LEDA 93440 GiC 04 34 12.9 -13 10 03   17.42       ~ 9 0
48 [CCD2008] ACO 496 J043413.08-131231.6 GiC 04 34 13.094 -13 12 32.14     19.61     ~ 4 0
49 [CCD2008] ACO 496 J043414.54-131303.0 GiC 04 34 14.582 -13 13 03.45           ~ 2 0
50 LEDA 93441 GiC 04 34 15.3 -13 08 22           ~ 9 0
51 NAME Virgo Cluster ClG 12 30 47.8 +12 23 07           ~ 7107 0
52 ACO 1656 ClG 12 59 44.40 +27 54 44.9           ~ 5141 2
53 NAME Shapley Supercluster SCG 13 06.0 -33 04           ~ 677 0
54 ACO 1958 ClG 14 43 13 +30 58.3           ~ 53 0
55 ACO 2218 ClG 16 35 54.0 +66 13 00           ~ 827 1
56 NAME Local Group GrG ~ ~           ~ 9325 0

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