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- W4376602981 abstract "We present the peculiar case of PSZ2G091.83+26.11 at z=0.822. This cluster hosts a Mpc-scale radio halo and an elongated radio source, whose location with the respect to the intracluster medium (ICM) distribution and to the cluster centre is not consistent with a simple merger scenario. We use VLA data at 1-4 GHz to investigate the spectral and polarisation properties of the diffuse radio emission. We combine them with previously published data from LOFAR n the 120-168 MHz band, and from the uGMRT at 250-500 and 550-900 MHz. We also complement the radio data with Chandra X-ray observations to compare the thermal and non-thermal emission of the cluster. The elongated radio emission is visible up to 3.0 GHz and has an integrated spectral index of $-1.24pm0.03$, with a steepening from $-0.89pm0.03$ to $-1.39pm0.03$. These values correspond to Mach numbers $mathcal{M}_{rm radio,int}=3.0pm0.19$ and $mathcal{M}_{rm radio,inj}=2.48pm0.15$. Chandra data reveals a surface brightness discontinuity at the location of the radio source, with a compression factor of $mathcal{C}=2.22^{+0.39}_{-0.30}$ (i.e. $mathcal{M}_{rm Xray}=1.93^{+0.42}_{-0.32}$). We also find that the source is polarised at GHz frequencies. We estimate an intrinsic polarisation fraction of $sim0.2$, a Rotation Measure of $sim50~{rm rad~m^{-2}}$ (including the Galactic contribution) and an external depolarisation of $sim60~{rm rad~m^{-2}}$. The $B$-vectors are aligned with the major axis of the source, suggesting magnetic field compression. Hence, we classify this source as a radio relic. We also find a linear/super-linear correlation between the non-thermal and thermal emission. We propose an off-axis merger and/or multiple merger events to explain the position and orientation of the relic. Given the properties of the radio relic, we speculate that PSZ2G091.83+26.11 is in a fairly young merger state." @default.
- W4376602981 created "2023-05-17" @default.
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- W4376602981 date "2023-05-15" @default.
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- W4376602981 title "The diffuse radio emission in the high-redshift cluster PSZ2 G091.83+26.11: Total intensity and polarisation analysis with Very Large Array 1-4 GHz observations" @default.
- W4376602981 doi "https://doi.org/10.1051/0004-6361/202345905" @default.
- W4376602981 hasPublicationYear "2023" @default.
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