Simulating the galaxy cluster “El Gordo”: gas motion, kinetic Sunyaev-Zel’dovich signal, and X-ray line features

Kavli Affiliate: Qingjuan Yu

| First 5 Authors: Congyao Zhang, Qingjuan Yu, Youjun Lu, ,

| Summary:

The massive galaxy cluster "El Gordo" (ACT-CL J0102–4915) is a rare merging
system with a high collision speed suggested by multi-wavelength observations
and the theoretical modeling. Zhang et al. (2015) propose two types of mergers,
a nearly head-on merger and an off-axis merger with a large impact parameter,
to reproduce most of the observational features of the cluster, by using
numerical simulations. The different merger configurations of the two models
result in different gas motion in the simulated clusters. In this paper, we
predict the kinetic Sunyaev-Zel’dovich (kSZ) effect, the relativistic
correction of the thermal Sunyaev-Zel’dovich (tSZ) effect, and the X-ray
spectrum of this cluster, based on the two proposed models. We find that (1)
the amplitudes of the kSZ effect resulting from the two models are both on the
order of $Delta T/Tsim10^{-5}$; but their morphologies are different, which
trace the different line-of-sight velocity distributions of the systems; (2)
the relativistic correction of the tSZ effect around $240 {rm,GHz}$ can be
possibly used to constrain the temperature of the hot electrons heated by the
shocks; and (3) the shift between the X-ray spectral lines emitted from
different regions of the cluster can be significantly different in the two
models. The shift and the line broadening can be up to $sim 25{rm,eV}$ and
$50{rm,eV}$, respectively. We expect that future observations of the kSZ
effect and the X-ray spectral lines (e.g., by ALMA, XARM) will provide a strong
constraint on the gas motion and the merger configuration of ACT-CL
J0102–4915.

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