2011A&A...528A..24V


C.D.S. - SIMBAD4 rel 1.7 - 2020.12.03CET13:25:47

2011A&A...528A..24V - Astronomy and Astrophysics, volume 528A, 24-24 (2011/4-1)

The unmixed kinematics and origins of diffuse stellar light in the core of the Hydra I cluster (Abell 1060).

VENTIMIGLIA G., ARNABOLDI M. and GERHARD O.

Abstract (from CDS):

Diffuse intracluster light (ICL) and cD galaxy halos are believed to stem from galaxy evolution and disruption in clusters. The processes involved may be constrained by studying the dynamical state of the ICL and the galaxies in the cluster core. Here we present a kinematic study of diffuse light in the Hydra I (Abell 1060) cluster core, using planetary nebulas (PNs) as tracers. We used multi-slit imaging spectroscopy with FORS2 on VLT-UT1 to detect 56 PNs associated with diffuse light in the central 100x100kpc2 of the Hydra I cluster, at a distance of ∼50Mpc. We measured their [OIII] m5007 magnitudes, sky positions, and line-of-sight velocity distribution (LOSVD), and compared them with the phase-space distribution of nearby galaxies. The luminosity function of the detected PNs is consistent with that expected at a distance of ∼50Mpc. Their number density is ∼4 times lower for the light seen than expected, and we discuss ram pressure stripping of the PNs by the hot intracluster medium as one of the possible explanations. The LOSVD histogram of the PNs is highly non-Gaussian and multipeaked: it is dominated by a broad central component with σ∼500km/s at around the average velocity of the cluster, and shows two additional narrower peaks at 1800km/s and 5000km/s. The main component is broadly consistent with the outward continuation of the intracluster halo of NGC 3311, which was earlier shown to have a velocity dispersion of ∼470km/s at radii of >50''. Galaxies with velocities in this range are absent in the central 100x100kpc2 and may have been disrupted earlier to build this component. The PNs in the second peak in the LOSVD at 5000km/s are coincident spatially and in velocities with a group of dwarf galaxies in the MSIS field. They may trace the debris from the ongoing tidal disruption of these galaxies. Most of the diffuse light in the core of Abell 1060 is still not phase-mixed. The build-up of ICL and the dynamically hot cD halo around NGC 3311 are ongoing, through the accretion of material from galaxies falling into the cluster core and tidally interacting with its potential well.

Abstract Copyright:

Journal keyword(s): galaxies: clusters: general - galaxies: clusters: individual: hydra I - galaxies: elliptical and lenticular, cD - galaxies: individual: NGC 3311 - planetary nebulae: general

Simbad objects: 13

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Number of rows : 13

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 1399 BiC 03 38 29.083 -35 27 02.67 11.05 9.74 9.59 8.12   ~ 1465 1
2 ACO S 373 ClG 03 38 30 -35 27.3           ~ 1574 0
3 NAME HYA SUPERCL SCG 08 57.9 +03 10           ~ 154 0
4 NGC 3309 GiG 10 36 35.651 -27 31 06.35   11.98 11.78 10.34 10.51 ~ 146 0
5 NAME Hydra I Cluster ClG 10 36 36.0 -27 31 04           ~ 780 1
6 NGC 3311 BiC 10 36 42.821 -27 31 42.02   11.93 10.93 10.00 9.67 ~ 271 2
7 NGC 3312 LIN 10 37 02.549 -27 33 54.17   12.63 13.96     ~ 97 0
8 NGC 3314 EmG 10 37 12.9213347865 -27 41 02.306439471   13.57 13.11 12.42   ~ 41 0
9 M 87 BiC 12 30 49.42338230 +12 23 28.0438581 10.16 9.59 8.63   7.49 ~ 6301 3
10 NAME NGC 5044 Group GrG 13 14 22.7 -16 32 04           ~ 171 0
11 ACO 2199 ClG 16 28 37.0 +39 31 28           ~ 1110 1
12 3C 338.0 QSO 16 28 38.2447110 +39 33 04.233634   12.78 11.78     ~ 709 5
13 CD-44 12736 PM* 18 36 25.9487430436 -44 18 36.919462094   10.83 10.22     G0 196 0

    Equat.    Gal    SGal    Ecl

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2020.12.03-13:25:47

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