A Detailed View of the Large-Scale Sloshing Cold Front in RXJ2014.8-2430

TL;DR

This paper presents a detailed analysis of multiple cold fronts in galaxy cluster RXJ2014.8-2430 using deep Chandra X-ray observations, revealing fine structures and potential gas cavities indicative of complex cluster dynamics.

Contribution

The study provides high-resolution insights into the structure and properties of cold fronts and a possible gas cavity, advancing understanding of cluster sloshing and AGN feedback mechanisms.

Findings

Confirmed three cold fronts and their locations.

Discovered a large concave structure possibly due to Kelvin-Helmholtz instability or AGN activity.

Cold front widths are consistent with suppressed diffusion across them.

Abstract

We analyze our new 144 ks deep Chandra observation of the sloshing cold front cluster RXJ2014.8-2430. Previous observations of RXJ2014.8-2430 with XMM-Newton shows evidence of a large scale, sloshing cold front around 800 kpc away from the cluster core. Previous shallow Chandra data also shows evidence of two younger cold fronts closer to the core. Our new deeper Chandra data allow us to analyze the fine, small scale structure of these three cold fronts. Using both beta model subtraction and Gaussian Gradient Magnitude filtering, we confirm the locations of the three cold fronts, as well as discover a large concave structure southeast of the cluster core near the outermost cold front, which could be a large Kelvin-Helmholtz instability or a gas cavity from AGN activity. Analyzing the three cold fronts, we measure the widths of the cold fronts and find them to be consistent with or lower than the Coulomb mean free paths within error, signifying that diffusion is suppressed across the cold fronts. If the concave feature is the inner rim of a cavity, we find that it has a radius in the range 200-330kpc, and would have $PV$ values in the range of $5.7 \times 10^{60}$ - $2.7 \times 10^{61}$ erg. These values would make it consistent with the some of the most powerful bubbles observed.