A deep dive: Chandra observations of the NGC 4839 group falling into the Coma cluster
arXiv:2304.05419 · doi:10.1093/mnras/stad1088
Abstract
Cosmological simulations of structure formation predict that galaxy clusters continue to grow and evolve through ongoing mergers with group-scale systems. During these merging events, the ram pressure applied by the intracluster medium acts to strip the gas from the infalling groups, forming large tails of stripped gas, which eventually become part of the main cluster. In this work, we present a detailed analysis of our new deep Chandra observations of the NGC 4839 group falling into the nearby Coma cluster, providing a unique opportunity to explore the way galaxy clusters in the local universe continue to grow. Our analysis reveals a cold front feature at the leading head of the group, preceded by a bow shock of hot gas in front with a Mach number of . The power spectrum of surface brightness fluctuations in the tail shows that the slope gets less steep as the distance from the leading head increases, changing from at the inner part of the tail to at the outermost part of the tail. These values are shallower than the slope of the Kolmogorov 2D power spectrum, indicating that thermal conduction is being suppressed throughout the tail, enabling long-lived small-scale turbulence, which would typically be washed out if thermal conduction was not inhibited. The characteristic amplitude of surface brightness fluctuations in the tail suggests a mild level of turbulence with a Mach number in the range of 0.1-0.5, agreeing with that found for the infalling group in Abell 2142.
10 pages, 10 figures, 3 tables. Accepted for publication in MNRAS
References in corpus (14)
- Shocks and cold fronts in galaxy clusters
- Contour binning: a new technique for spatially-resolved X-ray spectroscopy applied to Cassiopeia A
- The relation between gas density and velocity power spectra in galaxy clusters: high-resolution hydrodynamic simulations and the role of conduction
- The stripping of a galaxy group diving into the massive cluster A2142
- The growth of the galaxy cluster Abell 85: mergers, shocks, stripping and seeding of clumping
- A Mexican Hat with holes: calculating low resolution power spectra from data with gaps
- Stripped elliptical galaxies as probes of ICM physics: II. Stirred, but mixed? Viscous and inviscid gas stripping of the Virgo elliptical M89
- Stripped elliptical galaxies as probes of ICM physics: I. Tails, wakes, and flow patterns in and around stripped ellipticals
- The Coma cluster at LOFAR frequencies I: insights into particle acceleration mechanisms in the radio bridge
- Like a spider in its web: a study of the Large Scale Structure around the Coma cluster
- Deep Chandra observations of the stripped galaxy group falling into Abell 2142
- A complete view of the outskirts of the Coma cluster
- A New Class of X-Ray Tails of Early-Type Galaxies and Subclusters in Galaxy Clusters - Slingshot Tails vs Ram Pressure Stripped Tails
- The BIG X-ray tail