Three-dimensional thermodynamic structures of the intracluster medium across edges in the X-ray surface brightness of massive, bright, dynamically-active galaxy clusters
arxiv(2024)
摘要
We present a detailed study of three-dimensional (3D) thermodynamic
structures of the intracluster medium (ICM) across edges in the X-ray surface
brightness of four massive, bright, dynamically-active galaxy clusters (A3667,
A2319, A520, and A2146), with the Chandra X-ray Observatory. Based on a forward
modeling approach developed in previous work, we extend this approach with more
generalized ICM density and temperature profiles, allowing us to apply
uniformly to the observed X-ray surface brightness profiles to detect edges and
measure the 3D thermodynamic profiles of the ICM simultaneously and
self-consistently. With the forward modeling analysis, we find, in agreement
with previous works, that the obtained 3D thermodynamic structures of the ICM
across the edges in A3667 and A2319 are consistent with the characteristics of
cold fronts, whereas those in A520 and A2146 are consistent with the nature of
shock fronts. We find that the azimuthal distribution of the pressure ratio at
the cold front in A3667 shows a different trend from that in A2319. For the
shock fronts in A520 and A2146, the observed 3D temperature profiles of the ICM
indicate that the temperature is highest at the position of the shock front. In
the case of the sector exhibiting M = 2.4 in A520, the ICM temperature appears
isothermal with a temperature of 10 keV until 300 kpc away from the shock
front in the post-shock region, being consistent with the hypothesis of the
instant-equilibration model for shock-heating.
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