Vertaisarvioitu alkuperäisartikkeli tai data-artikkeli tieteellisessä aikakauslehdessä (A1)

Brightest cluster galaxies: the centre can(not?) hold




Julkaisun tekijätDe Propris Roberto, West Michael J, Andrade-Santos Felipe, Ragone-Figueroa Cinthia, Rasia Elena, Forman William, Jones Christine, Kipper Rain, Borgani Stefano, Lambas Diego García, Romashkova Elena A, Patra Kishore C

KustantajaOXFORD UNIV PRESS

Julkaisuvuosi2021

JournalMonthly Notices of the Royal Astronomical Society

Tietokannassa oleva lehden nimiMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Lehden akronyymiMON NOT R ASTRON SOC

Volyymi500

Julkaisunumero1

Aloitussivu310

Lopetussivun numero318

Sivujen määrä9

ISSN0035-8711

eISSN1365-2966

DOIhttp://dx.doi.org/10.1093/mnras/staa3286

Rinnakkaistallenteen osoitehttps://research.utu.fi/converis/portal/detail/Publication/53023382


Tiivistelmä
We explore the persistence of the alignment of brightest cluster galaxies (BCGs) with their local environment. We find that a significant fraction of BCGs do not coincide with the centroid of the X-ray gas distribution and/or show peculiar velocities (they are not at rest with respect to the cluster mean). Despite this, we find that BCGs are generally aligned with the cluster mass distribution even when they have significant offsets from the X-ray centre and significant peculiar velocities. The large offsets are not consistent with simple theoretical models. To account for these observations BCGs must undergo mergers preferentially along their major axis, the main infall direction. Such BCGs may be oscillating within the cluster potential after having been displaced by mergers or collisions, or the dark matter halo itself may not yet be relaxed.

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Last updated on 2023-21-04 at 13:07