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19 April 2024 |
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ClG 0217+70: A massive merging galaxy cluster with a large radio halo and relics | | X. Zhang
; A. Simionescu
; J. S. Kaastra
; H. Akamatsu
; D. N. Hoang
; C. Stuardi
; R. J. van Weeren
; L. Rudnick
; R. P. Kraft
; S. Brown
; | | Date: |
16 Sep 2020 | | Abstract: | We present an analysis of archival Chandra data of the merging galaxy cluster
ClG 0217+70. The Fe XXV He$alpha$ X-ray emission line is clearly visible in
the 25 ks observation, allowing a precise determination of the redshift of the
cluster as $z=0.180pm0.006$. We measure $kT_{500}=8.3pm0.4$ keV and estimate
$M_{500}=(1.06pm0.11) imes10^{15} M_odot$ based on existing scaling
relations. Correcting both the radio and X-ray luminosities with the revised
redshift reported here, which is much larger than previously inferred based on
sparse optical data, this object is no longer an X-ray underluminous outlier in
the $L_mathrm{X}-P_mathrm{radio}$ scaling relation. The new redshift also
means that, in terms of physical scale, ClG 0217+70 hosts one of the largest
radio halos and one of the largest radio relics known to date. Most of the
relic candidates lie in projection beyond $r_{200}$. The X-ray morphological
parameters suggest that the intracluster medium is still dynamically disturbed.
Two X-ray surface brightness discontinuities are confirmed in the northern and
southern parts of the cluster, with density jumps of $1.40pm0.16$ and
$3.0pm0.6$, respectively. We also find a $700 imes200$ kpc X-ray faint
channel in the western part of the cluster, which may correspond to compressed
heated gas or increased non-thermal pressure due to turbulence or magnetic
fields. | | Source: | arXiv, 2009.07580 | | Services: | Forum | Review | PDF | Favorites | |
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