A Hot Spot in Coma
arXiv:astro-ph/9809380 · doi:10.1086/306901
Abstract
We study the temperature structure of the central part (r<18' ~0.7 h50**-1 Mpc) of the Coma cluster of galaxies using ASCA data. Two different analysis methods produce results in good agreement with each other and reveal the presence of interesting structures in the gas temperature distribution. Globally, the average temperature in the center of the cluster is 9.0 +/- 0.6 keV in good agreement with previous results. Superimposed on this, we find a cool area with temperatures of 4-6 keV associated with a filament of X-ray emission extending southeast from the cluster center detected by Vikhlinin and coworkers. We also find a hot spot with a temperature of around 13 keV displaced north from the central peak of emission. The distribution of the gas temperatures and relative specific entropies suggests that the cool features are most likely gas stripped from a galaxy group centered on NGC 4874 falling toward the core from outside, while the hot spot located ``ahead'' of this in-falling gas is due to shock heating. Thus our results suggest that we are observing Coma during a minor merger with a small group of galaxies associated with NGC 4874 shortly before the initial core passage.
5 pages, 2 figures, accepted for publication in the Astrophysical Journal
References in corpus (3)
Cited by in corpus (35)
- The Energy Spectrum of Primary Cosmic Ray Electrons in Clusters of Galaxies and Inverse Compton Emission
- Properties of Cosmic Shock Waves in Large Scale Structure Formation
- A Comparison of Radio and X-Ray Morphologies of Four Clusters of Galaxies Containing Radio Halos
- VLA HI imaging of the brightest spiral galaxies in Coma
- Dynamical Evolution of Galaxies in Clusters
- Physics of the Merging Clusters Cygnus A, A3667, and A2065
- XMM- Newton Observation of the Coma Galaxy Cluster: The temperature structure in the central region
- The dynamical state of the Coma cluster with XMM-Newton
- Chandra Observation of RXJ1720.1+2638: a Nearly Relaxed Cluster with a Fast Moving Core?
- Two-Temperature Intracluster Medium in Merging Clusters of Galaxies
- The duty cycle of radio-mode feedback in complete samples of clusters
- XMM-Newton discovery of an X-ray filament in Coma
- Results from a Second RXTE Observation of the Coma Cluster
- EUV Emission in Abell 1795, Abell 2199, and the Coma Cluster
- The spatial distribution of galaxies of different spectral types in the massive intermediate-redshift cluster MACSJ0717.5+3745
- Large scale diffuse light in the Coma cluster: a multi-scale approach
- Merging Binary Clusters
- Morphology parameters: substructure identification in X-ray galaxy clusters
- Measuring bulk flows of the intracluster medium in the Perseus and Coma galaxy clusters using XMM-Newton
- A Mosaic of the Coma Cluster of Galaxies with XMM-Newton
- Off-Center Mergers of Clusters of Galaxies and Nonequipartition of Electrons and Ions in Intracluster Medium
- Tempestuous life beyond R_500: X-ray view on the Coma cluster with SRG/eROSITA. I. X-ray morphology, recent merger, and radio halo connection
- Far-Infrared Emission from Intracluster Dust in Abell Clusters
- Hard X-ray emission from the galaxy cluster A3667
- Linear Structures in the Core of the Coma Cluster of Galaxies
- A NuSTAR observation of the center of the Coma Cluster
- X-Ray Observations of Cluster Mergers: Cluster Morphologies and Their Implications
- X-ray Emitting Groups in the Infall Region of Abell 2199
- ASCA Temperature Maps of Three Clusters of Galaxies Abell 1060, AWM7, and the Centaurus Cluster
- A complete view of the outskirts of the Coma cluster
- The Origin of Radio Haloes and Non-thermal Emission in Clusters of Galaxies
- Reconstructing the Merger History of the A3266 Galaxy Cluster
- Suzaku Observations of Iron K-lines from the Intracluster Medium of the Coma Cluster
- The Baryonic and Dark Matter Distributions in Abell 401
- Flattening of Galaxies of Different Morphological Types in Subclusters of Coma