Imaging-spectroscopy diagnosis of the giant sloshing spiral in the Virgo cluster with the Einstein Probe Follow-up X-ray Telescope

Abstract

We performed deep X-ray observations of the Virgo cluster using the Einstein Probe Follow-up X-ray Telescope (EP-FXT) with a total exposure of 295 ks. Leveraging the large field of view (FoV) and low particle background of EP-FXT, the image reveals a giant spiral feature connecting the cold fronts in the northwest and southeast, forming a coherent structure consistent with earlier results from XMM-Newton and Suzaku. We also present two-dimensional maps of temperature, metallicity, and entropy across the Virgo Cluster, covering a FoV of approximately 28.5 arcmin. These maps clearly show a spiral structure with high density, low temperature, high metallicity, and low entropy. The results support a scenario where the spiral morphology arises from gas sloshing driven by a minor merger. Additionally, EP-FXT temperature measurements agree well with XMM-Newton data within uncertainties.

10 pages, 16 figures. Accepted for publication in A&A

References in corpus (19)

• Shocks and cold fronts in galaxy clusters
• The origin of cold fronts in the cores of relaxed galaxy clusters
• Contour binning: a new technique for spatially-resolved X-ray spectroscopy applied to Cassiopeia A
• XMM-Newton and Chandra Cross Calibration Using HIFLUGCS Galaxy Clusters: Systematic Temperature Differences and Cosmological Impact
• Science objectives of the Einstein Probe mission
• The gaseous atmosphere of M87 seen with XMM-Newton
• Metal distribution in sloshing galaxy clusters: the case of A496
• Estimate of the Background and Sensitivity of theFollow-up X-ray Telescope onboard Einstein Probe
• Measuring sloshing, merging and feedback velocities in the Virgo cluster
• Cold fronts and multi-temperature structures in the core of Abell 2052
• X-ray analysis of JWST's first galaxy cluster lens SMACS J0723.3-7327
• Nonthermal phenomena in the center of Abell 1775: An 800 kpc head-tail, revived fossil plasma and slingshot radio halo
• The SRG/eROSITA All-Sky Survey: SRG/eROSITA cross-calibration with Chandra and XMM-Newton using galaxy cluster gas temperatures
• The SRG/eROSITA All-Sky Survey: View of the Virgo Cluster
• X-Ray observations of a subhalo associated with the NGC 4839 group infalling toward the Coma cluster
• Sloshing Cold Fronts in Galaxy Cluster Abell 2566
• Origin of cool cores, cold fronts and spiral structures in cool core clusters of galaxies
• Sloshing and spiral structures breeding a putative radio mini-halo in the environment of a cool-core cluster Abell 795
• A Chandra Study of the NGC7618/UGC12491 Major Group Merger at Apogee: Multiple Cold Fronts, Boxy Wings, Filaments, and Arc-shaped Slingshot Tails