Suzaku Observations of the Cluster Outskirts and Intercluster Filament in the Triple Merger Cluster Abell 98

Abstract

We present Suzaku observations of the Abell 98 (A98) triple galaxy cluster system and the purported intercluster filament. The three subclusters are expected to lie along a large scale cosmic filament. With partial azimuthal coverage of the northernmost cluster, we find that the inferred entropy profile of this relatively low mass cluster ($kT\approx 2.8$ keV) adheres to expectations from models of self-similar pure gravitational collapse in the region of the virial radius. There is evidence of extended structure beyond $r_{200}$ to the north of the northernmost cluster, along the merger axis, with properties consistent with what is expected for the warm-hot intergalacitc medium (WHIM; $kT=0.11_{-0.02}^{+0.01}$ keV, $n_e={7.6\times 10^{-5}}_{-3.6\times 10^{-5}}^{+3.6\times 10^{-5}}$~cm${}^{-3}$). No such emission is detected at the same radius in regions away from the merger axis, consistent with the expectation that the merger axis of this triple system lies along a large scale cosmic filament. In the bridge region between A98N and A98S, there is evidence of filamentary emission at the $2.2\sigma$ level, as well as a tentative detection of cool gas ($kT\sim 1$ keV). The entropy profile of this intercluster filament suggests that the A98 system is most likely aligned closer to the plane of the sky rather than along the line of sight. The structure to the north of the system, as well as in between A98N and A98S is indicative that the clusters are connected to a larger-scale structure spanning at least 4 Mpc.

arXiv commentSubmitted to ApJ. Comments are welcome

References in corpus (40)

• Collisional Plasma Models with APEC/APED: Emission Line Diagnostics of Hydrogen-like and Helium-like Ions
• Chandra Cluster Cosmology Project II: Samples and X-ray Data Reduction
• An investigation of cooling flows and general cluster properties from an X-ray image deprojection analysis of 207 clusters of galaxies
• Residual Gas Motions in the Intracluster Medium and Bias in Hydrostatic Measurements of Mass Profiles of Clusters
• The resolved fraction of the Cosmic X-ray Background
• Gas entropy in a representative sample of nearby X-ray galaxy clusters (REXCESS): relationship to gas mass fraction
• The Search for the Missing Baryons at Low Redshift
• Reproducibility of Non-X-ray Background for the X-ray Imaging Spectrometer aboard Suzaku
• The baseline intracluster entropy profile from gravitational structure formation
• Baryons at the Edge of the X-ray Brightest Galaxy Cluster
• Scaling Properties of a Complete X-ray Selected Galaxy Group Sample
• Turbulent Motions and Shocks Waves in Galaxy Clusters simulated with AMR
• Universal thermodynamic properties of the intracluster medium over two decades in radius in the X-COP sample
• XMM-Newton and Chandra Cross Calibration Using HIFLUGCS Galaxy Clusters: Systematic Temperature Differences and Cosmological Impact
• Detection of hot gas in the filament connecting the clusters of galaxies Abell 222 and Abell 223
• Heating the hot atmospheres of galaxy groups and clusters with cavities: the relationship between jet power and low-frequency radio emission
• Suzaku Observations of Abell 1795: Cluster Emission to R_200
• X-ray Temperature and Mass Measurements to the Virial Radius of Abell 1413 with Suzaku
• The Physics of Galaxy Cluster Outskirts
• Simulating the physical properties of dark matter and gas inside the cosmic web
• On the Cluster Physics of Sunyaev-Zel'dovich and X-ray Surveys III: Measurement Biases and Cosmological Evolution of Gas and Stellar Mass Fractions
• Gas clumping in galaxy clusters
• Do the Electrons and Ions in X-ray Clusters Share the Same Temperature?
• X-ray exploration of the outskirts of the nearby Centaurus cluster using Suzaku and Chandra
• The Abell 3391/95 galaxy cluster system: A 15 Mpc intergalactic medium emission filament, a warm gas bridge, infalling matter clumps, and (re-) accelerated plasma discovered by combining SRG/eROSITA data with ASKAP/EMU and DECam data
• X-ray observations of the galaxy cluster Abell 2029 to the virial radius
• The XMM Cluster Outskirts Project (X-COP): Physical conditions to the virial radius of Abell 2142
• HICOSMO - Cosmology with a complete sample of galaxy clusters: II. Cosmological results
• Probing the Outskirts of the Early Stage Galaxy Cluster Merger A1750
• Effects of the Non-Equipartition of Electrons and Ions in the Outskirts of Relaxed Galaxy Clusters
• Understanding `galaxy groups' as a unique structure in the universe
• Non-Equilibrium Electrons in the Outskirts of Galaxy Clusters
• A complete view of the outskirts of the Coma cluster
• The Entire Virial Radius of the Fossil Cluster RXJ1159+5531: I. Gas Properties
• Properties of clumps and filaments around galaxy clusters
• Detailed SZ study of 19 LoCuSS galaxy clusters: masses and temperatures out to the virial radius
• Discovery of a pre-merger shock in an intercluster filament in Abell 98
• Substructure in clusters containing wide-angle tailed radio galaxies. I. New redshifts
• Joint Suzaku and Chandra observations of the MKW4 galaxy group out to the virial radius
• Merger Signatures in the Galaxy Cluster Abell 98

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