2011A&A...533A.138C


C.D.S. - SIMBAD4 rel 1.7 - 2019.07.18CEST22:28:49

2011A&A...533A.138C - Astronomy and Astrophysics, volume 533A, 138-138 (2011/9-1)

Stellar population and the origin of intra-cluster stars around brightest cluster galaxies: the case of NGC 3311.

COCCATO L., GERHARD O., ARNABOLDI M. and VENTIMIGLIA G.

Abstract (from CDS):

We investigate the stellar population and the origin of diffuse light around brightest cluster galaxies. We study the stellar population of the dynamically hot stellar halo of NGC 3311, the brightest galaxy in the Hydra I cluster, and that of photometric substructures in the diffuse light to constrain the origin of these components. We analyze absorption lines in medium-resolution, long-slit spectra in the wavelength range 4800-5800 Å obtained with FORS2 at the Very Large Telescope. We measure the equivalent width of Lick indices out to 20kpc from the center of NGC 3311 and fit them with stellar population models that account for the [α/Fe] overabundance. Stars in the dynamically hot halo of NGC 3311 are old (age>13Gyr), metal-poor ([Z/H]~-0.35), and alpha-enhanced ([α/Fe]∼0.48). Together with the high velocity dispersion, these measurements indicate that the stars in the halo were accreted from the outskirts of other early-type galaxies, with a possible contribution from dwarf galaxies. We identify a region in the halo of NGC 3311 associated with a photometric substructure where the stellar population is even more metal-poor ([Z/H]~-0.73). In this region, our measurements are consistent with a composite stellar population superposed along the line of sight, consisting of stars from the dynamically hot halo of NGC 3311 and stars stripped from dwarf galaxies. The latter component contributes ≤28% to the local surface brightness. The build-up of diffuse light around NGC 3311 is on-going. Based on the observed stellar population properties, the dominant part of these stars may have come from the outskirts of bright early-type galaxies, while stars from stripped dwarf galaxies are presently being added.

Abstract Copyright:

Journal keyword(s): galaxies: halos - galaxies: clusters: individual: Hydra I (Abell 1060) - galaxies: individual: HCC 26

Simbad objects: 21

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Number of rows : 21

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 BAX 013.5117-28.3994 ClG 00 54 02.8 -28 23 58           ~ 16 0
2 NGC 1400 EmG 03 39 30.851 -18 41 17.25 12.48 12.01 10.96 10.45   ~ 270 1
3 NGC 1407 GiG 03 40 11.904 -18 34 49.36   10.64 9.67 9.13   ~ 500 1
4 ESO 436-4 G 10 14 48.5723758694 -28 57 25.375713303   14.96   13.51   ~ 16 0
5 IC 2586 GiG 10 31 02.406 -28 42 59.77   13.68   12.09   ~ 29 0
6 ESO 501-3 GiG 10 31 48.3657090838 -26 33 55.529414436   13.77   12.32   ~ 28 0
7 ESO 501-13 GiG 10 33 30.048 -26 53 51.03   13.94   12.49   ~ 32 0
8 ESO 436-45 GiG 10 34 50.8447801804 -28 30 45.655761305   15.10   13.72   ~ 25 0
9 NGC 3305 GiG 10 36 11.832 -27 09 43.98   13.88 12.78 12.31   ~ 54 0
10 NGC 3308 GiG 10 36 22.372 -27 26 17.20   13.29 12.36 11.73 11.11 ~ 71 0
11 NGC 3309 GiG 10 36 35.651 -27 31 06.35   11.98 11.78 10.34 10.51 ~ 140 0
12 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 762 1
13 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 260 2
14 HCC 26 GiC 10 36 45.85 -27 31 24.2     17.87   16.94 ~ 12 0
15 ESO 437-15 AGN 10 36 58.114 -28 10 35.14   13.55   12.18   ~ 35 0
16 IC 2597 GiG 10 37 47.344 -27 04 52.46   12.75   11.08   ~ 90 0
17 ESO 437-45 GiG 10 41 59.7799163662 -28 46 36.165818205   14.00   12.48   ~ 31 0
18 NGC 3557 rG 11 09 57.653 -37 32 21.02   11.50 10.40 9.79   ~ 248 2
19 NAME Vir I ClG 12 26 32.1 +12 43 24   10.00 8.49     ~ 5599 0
20 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4055 2
21 ACO 3888 ClG 22 34 23.0 -37 43 29           ~ 117 1

    Equat.    Gal    SGal    Ecl

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2019.07.18-22:28:49

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