2010A&A...520L...9V


Query : 2010A&A...520L...9V

2010A&A...520L...9V - Astronomy and Astrophysics, volume 520, L9-9 (2010/9-2)

The dynamically hot stellar halo around NGC 3311: a small cluster-dominated central galaxy.

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

Abstract (from CDS):

An important open question is the relation between intracluster light and the halos of central galaxies in galaxy clusters. Here we report results from an on going project with the aim to characterize the dynamical state in the core of the Hydra I (Abell 1060) cluster around NGC 3311. We analyze deep long-slit absorption line spectra reaching out to ∼25kpc in the halo of NGC 3311. We find a very steep increase in the velocity dispersion profile from a central σ0=150km/s to σout≃450km/s at R≃12kpc. Farther out, to ∼25kpc, σ appears to be constant at this value, which is ∼60% of the velocity dispersion of the Hydra I galaxies. With its dynamically hot halo kinematics, NGC 3311 is unlike other normal early-type galaxies. These results and the large amount of dark matter inferred from X-rays around NGC 3311 suggest that the stellar halo of this galaxy is dominated by the central intracluster stars of the cluster, and that the transition from predominantly galaxy-bound stars to cluster stars occurs in the radial range 4 to 12kpc from the center of NGC 3311. We comment on the wide range of halo kinematics observed in cluster central galaxies, depending on the evolutionary state of their host clusters.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: Hydra I - galaxies: kinematics and dynamics - galaxies: individual: NGC 3311

Simbad objects: 10

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Number of rows : 10
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NGC 3309 GiG 10 36 35.6607096792 -27 31 05.732321664   11.98 11.78 10.34 10.51 ~ 153 0
2 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 805 1
3 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 285 2
4 GALEX J103645.9-273126 GiC 10 36 45.85 -27 31 24.2     17.87   16.94 ~ 13 0
5 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6647 3
6 NGC 4874 LIN 12 59 35.7093764280 +27 57 33.293892204 13.01 13.7 11.40 12.122 11.386 ~ 750 3
7 ACO 1656 ClG 12 59 48.7 +27 58 50           ~ 4502 2
8 NGC 4889 EmG 13 00 08.097 +27 58 37.29 12.93 13.0 11.30 11.652 10.906 ~ 674 1
9 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1128 1
10 3C 338.0 QSO 16 28 38.2446374616 +39 33 04.235250060   12.78 11.78     ~ 727 5

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2022.05.24-12:15:59

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