The complex intracluster medium of Abell 1569 and its interaction with central radio galaxies

Abstract

We present the first in-depth study of X-ray emission from a nearby ($z\sim 0.0784$) galaxy cluster Abell 1569 using an archival $Chandra$ observation. A1569 consists of two unbound subclusters $-$ a northern subcluster (A1569N) hosting a double-lobed radio galaxy 1233+169 at its centre, and a southern subcluster (A1569S) harbouring a wide-angle-tailed (WAT) radio source 1233+168. X-ray emission from A1569N and A1569S extends to a radius $r\sim 248$ kpc and $r\sim 370$ kpc, respectively, indicating that the two gas clumps are group-scale systems. The two subclusters have low X-ray luminosities ($\sim 10^{42-43}$ erg s${}^{-1}$), average elemental abundances $\sim$1/4 Z${}_{\odot }$, low average temperatures ($\sim 2$ keV), and lack large ($r\gtrsim 40-50$ kpc) cool cores associated with the intracluster gas. We detect a pair of cavities coincident with the radio lobes of 1233+169 in A1569N. The total mechanical power associated with the cavity pair is an order of magnitude larger than the X-ray radiative loss in the cavity-occupied region, providing corroborating evidence for cavity-induced heating of the intragroup gas in A1569N. A1569S exhibits possible evidence for a small-scale cluster-subcluster merger, as indicated by its high central entropy, and the presence of local gas elongation and a density discontinuity in between the bent radio tails of 1233+168. The discontinuity is indicative of a weak merger shock with Mach Number, $M\sim 1.7$. The most plausible geometry for the ongoing interaction is a head-on merger occurring between A1569S and a subcluster falling in from the west along the line bisecting the WAT tails.

arXiv comment20 pages, 12 figures, 9 tables. Accepted for publication in the MNRAS

References in corpus (58)

• Observational Evidence of AGN Feedback
• Heating Hot Atmospheres with Active Galactic Nuclei
• A Cosmology Calculator for the World Wide Web
• The Mass Function of an X-Ray Flux-Limited Sample of Galaxy Clusters
• A Systematic Study of Radio-Induced X-ray Cavities in Clusters, Groups, and Galaxies
• Tracing cosmic evolution with clusters of galaxies
• Calibration of X-ray absorption in our Galaxy
• Shocks and cold fronts in galaxy clusters
• Evolution of Buoyant Bubbles in M87
• Chandra X-ray Observations of the Hydra A Cluster: An Interaction Between the Radio Source and the X-Ray-Emitting Gas
• A deep Chandra observation of the Perseus cluster: shocks and ripples
• A Catalog of Galaxy Clusters Observed by XMM-Newton
• A moving cold front in the intergalactic medium of A3667
• Radiative Efficiency and Content of Extragalactic Radio Sources: Toward a Universal Scaling Relation Between Jet Power and Radio Power
• Cooling Flows as a Calorimeter of AGN Mechanical Power
• Absolute measurement of the unresolved cosmic X-ray background in the 0.5-8 keV band with Chandra
• On the prevalence of radio-loud AGN in brightest cluster galaxies: implications for AGN heating of cooling flows
• Chandra Observation of the Radio Source / X-ray Gas Interaction in the Cooling Flow Cluster Abell 2052
• X-ray Properties of Groups of Galaxies
• The intragroup medium in loose groups of galaxies
• Scaling Properties of a Complete X-ray Selected Galaxy Group Sample
• The cluster-scale AGN outburst in Hydra A
• The Observational Consequences of Merging Clusters of Galaxies
• A Systematic Study of X-Ray Substructure of Galaxy Clusters Detected in the ROSAT All-Sky Survey
• Evidence for AGN Feedback in Galaxy Clusters and Groups
• A statistically-selected Chandra sample of 20 galaxy clusters -- I. Temperature and cooling time profiles
• An XMM-Newton study of the environments, particle content and impact of low-power radio galaxies
• An Optical Catalog of Galaxy Clusters Obtained from an Adaptive Matched Filter Finder Applied to SDSS DR6
• Heating the hot atmospheres of galaxy groups and clusters with cavities: the relationship between jet power and low-frequency radio emission
• Why Do Only Some Galaxy Clusters Have Cool Cores?
• Temperature and abundance profiles of hot gas in galaxy groups - I. Results and statistical analysis
• A Parameter Space Exploration of Galaxy Cluster Mergers I: Gas Mixing and the Generation of Cluster Entropy
• The Physics of Cluster Mergers
• Hot Gas in Galaxy Groups: Recent Observations
• A High Fidelity Sample of Cold Front Clusters from the Chandra Archive
• Hydrodynamic simulations of merging clusters of galaxies
• Shock heating of the merging galaxy cluster A521
• Detecting edges in the X-ray surface brightness of galaxy clusters
• Deep Chandra Observations of the Extended Gas Sloshing Spiral in A2029
• Evidence for radio-source heating of groups
• Giant cavities, cooling and metallicity substructure in Abell 2204
• The interplay between radio galaxies and cluster environment
• The Radio Galaxy Populations of Nearby Northern Abell Clusters
• Galaxy cluster mergers
• Discovery of an X-ray cavity near the radio lobes of Cygnus A indicating previous AGN activity
• Active galactic nucleus feedback in clusters of galaxies
• The X-ray luminosity-temperature relation of a complete sample of low-mass galaxy clusters
• The Merger Environment of the WAT Hosting Cluster Abell 562
• Heating of the Intracluster Gas in the Triangulum Australis Cluster
• Tailed radio galaxies as tracers of galaxy clusters. Serendipitous discoveries with the GMRT
• On the Origin of Cool Core Galaxy Clusters: Comparing X-Ray Observations with Numerical Simulations
• The Interaction of 3C401 with the Surrounding Intracluster Medium
• A Chandra study of Abell 795 -- a sloshing cluster with a FR0 radio galaxy at its center
• The Cluster Dynamics, X-ray Emission, and Radio Galaxies in Abell 578 and Abell 1569
• Low-scatter galaxy cluster mass proxies for the eROSITA all-sky survey
• Suzaku Observations of Low Surface Brightness Cluster Abell 1631
• The Hercules cluster in X-rays with $XMM$-$Newton$ and $Chandra$
• High entropy and evidence for a merger in the low surface brightness cluster Abell 2399