The SRG/eROSITA All-Sky Survey: View of the Virgo Cluster

Abstract

As the closest galaxy cluster, the Virgo Cluster is an exemplary environment for the study of the large-scale filamentary structure and physical effects that are present in cluster outskirts but absent from the more easily studied inner regions. Here, we present an analysis of the SRG/eROSITA data from five all-sky surveys. eROSITA allows us to resolve the entire Virgo cluster and its outskirts on scales between 1 kpc and 3 Mpc, covering a total area on the sky of about 25${}^{\circ }$ by 25${}^{\circ }$. We utilized image manipulation techniques and surface brightness profiles to search for extended emission, surface brightness edges, and features in the outskirts. We employed a method of comparing mean and median profiles to measure gas clumping out to and beyond the virial radius. Surface brightness analysis of the cluster and individual sectors of the cluster reveal the full extent of previously identified cold fronts to the north and south. The emissivity bias due to gas clumping, which we quantify over three orders of magnitude in the radial range, is found to be mild, consistent with previous findings. We find uniform clumping measurements in all directions, with no enhancements along candidate filaments. We find an estimated virial gas mass of $M_{\mathrm{gas},r<r_{200}}=(1.98\pm 0.70)\times 10^{13}$ M${}_{\odot }$. Through imaging analysis we detect the presence of extended emission spanning 320\,kpc to the southwest of M49. The extension has a significance of 3.15$\sigma$ and is coincident with radio emission detected with LOFAR, which could be evidence of an accretion shock or turbulent reacceleration as the M49 group or background W' cloud falls into the cluster and interacts with the intracluster medium.

17 pages, 13 figures, Accepted by A&A

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Cited by in corpus (9)

• The SRG/eROSITA all-sky survey. X-ray emission from the warm-hot phase gas in long cosmic filaments
• Can the splashback radius be an observable boundary of galaxy clusters?
• The SRG/eROSITA all-sky survey: View of the Fornax galaxy cluster
• Virgo Filaments V: Disrupting the Baryon Cycle in the NGC 5364 Galaxy Group
• The ViCTORIA project: description of a multi-frequency radio survey of the Virgo galaxy cluster
• The Three Hundred: Gas Properties Outside of Galaxy Cluster with the WHIM Contribution and Detection
• The MeerKAT Fornax Survey VI. The collapse of the galaxy HI Mass Function in Fornax
• Imaging-spectroscopy diagnosis of the giant sloshing spiral in the Virgo cluster with the Einstein Probe Follow-up X-ray Telescope
• The SRG/eROSITA All-Sky Survey. Detection of shock-heated gas beyond the halo boundary into the accretion region