J 2017

Witnessing the growth of the nearest galaxy cluster: thermodynamics of the Virgo Cluster outskirts

SIMIONESCU, A., Norbert WERNER, A. MANTZ, S. W. ALLEN, Ondrej URBAN et. al.

Basic information

Original name

Witnessing the growth of the nearest galaxy cluster: thermodynamics of the Virgo Cluster outskirts

Authors

SIMIONESCU, A. (642 Romania), Norbert WERNER (703 Slovakia, guarantor, belonging to the institution), A. MANTZ (840 United States of America), S. W. ALLEN (826 United Kingdom of Great Britain and Northern Ireland) and Ondrej URBAN (703 Slovakia)

Edition

Monthly Notices of the Royal Astronomical Society, Oxford, OXFORD UNIV PRESS, 2017, 0035-8711

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

10308 Astronomy

Country of publisher

United Kingdom of Great Britain and Northern Ireland

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 5.194

RIV identification code

RIV/00216224:14310/17:00099809

Organization unit

Faculty of Science

DOI

UT WoS

000406629100015

Keywords in English

galaxies: clusters: individual: Virgo; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters

Tags

Tags

International impact, Reviewed
Změněno: 10/11/2022 13:10, Mgr. Marie Šípková, DiS.

Abstract

V originále

We present results from Suzaku Key Project observations of the Virgo Cluster, the nearest galaxy cluster to us, mapping its X-ray properties along four long 'arms' extending beyond the virial radius. The entropy profiles along all four azimuths increase with radius, then level out beyond similar to 0.5r(200), while the average pressure at large radii exceeds Planck Sunyaev-Zel'dovich measurements. These results can be explained by enhanced gas density fluctuations (clumping) in the cluster's outskirts. Using a standard Navarro, Frenk and White model, we estimate a virial mass, radius and concentration parameter of M-200 = 1.05 +/- 0.02 x 10(14) M-circle dot, r(200) = 974.1 +/- 5.7 kpc and c = 8.8 +/- 0.2, respectively. The inferred cumulative baryon fraction exceeds the cosmic mean at r similar to r(200) along the major axis, suggesting enhanced gas clumping possibly sourced by a candidate large-scale structure filament along the north-south direction. The Suzaku data reveal a large-scale sloshing pattern, with two new cold fronts detected at radii of 233 and 280 kpc along the western and southern arms, respectively. Two high-temperature regions are also identified 1 Mpc towards the south and 605 kpc towards the west of M87, likely representing shocks associated with the ongoing cluster growth. Although systematic uncertainties in measuring the metallicity for low-temperature plasma remain, the data at large radii appear consistent with a uniform metal distribution on scales of similar to 90 x 180 kpc and larger, providing additional support for the early chemical enrichment scenario driven by galactic winds at redshifts of 2-3.