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.Základní údaje
Originální název
Witnessing the growth of the nearest galaxy cluster: thermodynamics of the Virgo Cluster outskirts
Autoři
SIMIONESCU, A. (642 Rumunsko), Norbert WERNER (703 Slovensko, garant, domácí), A. MANTZ (840 Spojené státy), S. W. ALLEN (826 Velká Británie a Severní Irsko) a Ondrej URBAN (703 Slovensko)
Vydání
Monthly Notices of the Royal Astronomical Society, Oxford, OXFORD UNIV PRESS, 2017, 0035-8711
Další údaje
Jazyk
angličtina
Typ výsledku
Článek v odborném periodiku
Obor
10308 Astronomy
Stát vydavatele
Velká Británie a Severní Irsko
Utajení
není předmětem státního či obchodního tajemství
Impakt faktor
Impact factor: 5.194
Kód RIV
RIV/00216224:14310/17:00099809
Organizační jednotka
Přírodovědecká fakulta
UT WoS
000406629100015
Klíčová slova anglicky
galaxies: clusters: individual: Virgo; galaxies: clusters: intracluster medium; X-rays: galaxies: clusters
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 10. 11. 2022 13:10, Mgr. Marie Šípková, DiS.
Anotace
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.