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Bibliographical reference
Astronomy and Astrophysics, Volume 550, id.A132, 14 pp.
Description
The survey of galaxy clusters performed by Planck through the
Sunyaev-Zeldovich effect has already discovered many interesting
objects, thanks to its full sky coverage. One of the SZ candidates
detected inthe early months of the mission near to the signal-to-noise
threshold, PLCKG214.6+37.0, was later revealed by XMM-Newton to be a
triple system of galaxy clusters. We present the results from a deep
XMM-Newton re-observation of PLCKG214.6+37.0, part of a multi-wavelength
programme to investigate Planck discovered superclusters. The
characterisation of the physical properties of the three components has
allowed us to build a template model to extract the total SZ signal of
this system with Planck data. We have partly reconciled the discrepancy
between the expected SZ signal derived from X-rays and the observed one,
which are now consistent within 1.2σ. We measured the redshift of
the three components with the iron lines in the X-ray spectrum, and
confirm that the three clumps are likely part of the same supercluster
structure. The analysis of the dynamical state of the three components,
as well as the absence of detectable excess X-ray emission, suggests
that we are witnessing the formation of a massive cluster at an early
phase of interaction.
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FRANCISCO SHU
KITAURA JOYANES
