Bibcode
Barrena, R.; Girardi, M.; Boschin, W.; De Grandi, S.; Rossetti, M.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 442, Issue 3, p.2216-2227
Advertised on:
8
2014
Citations
9
Refereed citations
8
Description
We aim to review the internal structure and dynamics of the Abell 1351
cluster, shown to host a radio halo with a quite irregular shape. Our
analysis is based on radial velocity data for 135 galaxies obtained at
the Telescopio Nazionale Galileo. We combine galaxy velocities and
positions to select 95 cluster galaxy members and analyse the internal
dynamics of the whole cluster. We also examine X-ray data retrieved from
Chandra and XMM archives. We measure the cluster redshift, =
0.325, the line-of-sight (LOS) velocity dispersion, σV
˜ 1500 km s-1, and the X-ray temperature, kT ˜ 9
keV. From both X-ray and optical data independently, we estimate a large
cluster mass, in the 1-4 × 10^{15}h_{70}^{-1}{M}_{{⊙}} range.
We attribute the extremely high value of σV to the
bimodality in the velocity distribution. We find evidence of a
significant velocity gradient and optical 3D substructure. The X-ray
analysis also shows many features in favour of a complex cluster
structure, probably supporting an ongoing merger of substructures in
Abell 1351. The observational scenario agrees with the presence of two
main subclusters in the northern region, each with its brightest galaxy
(BCG1 and BCG2), detected as the two most important X-ray substructures
with a rest-frame LOS velocity difference of ΔVrf
˜ 2500 km s-1 and probably being in large part aligned
with the LOS. We conclude that Abell 1351 is a massive merging cluster.
The details of the cluster structure allow us to interpret the quite
asymmetric radio halo as a `normal' halo plus a southern relic, strongly
supporting a previous suggestion based only on inspection of radio and
preliminary X-ray data.
Related projects
Galaxy Evolution in Clusters of Galaxies
Galaxies in the universe can be located in different environments, some of them are isolated or in low density regions and they are usually called field galaxies. The others can be located in galaxy associations, going from loose groups to clusters or even superclusters of galaxies. One of the foremost challenges of the modern Astrophysics is to
Jairo
Méndez Abreu
Cosmology with Large Scale Structure Probes
The Cosmic Microwave Background (CMB) contains the statistical information about the early seeds of the structure formation in our Universe. Its natural counterpart in the local universe is the distribution of galaxies that arises as a result of gravitational growth of those primordial and small density fluctuations. The characterization of the
FRANCISCO SHU
KITAURA JOYANES