Artículo
Planes of Satellites around Simulated Disk Galaxies. II. Time-persistent Planes of Kinematically Coherent Satellites in ΛCDM
Santos Santos, Isabel; Gámez Marín, Matías; Dominguez Tenreiro, Rosa; Tissera, Patricia Beatriz
; Bignone, Lucas Axel
; Pedrosa, Susana Elizabeth
; Artal, Héctor; Gómez Flechoso, M. Ángeles; Rufo Pastor, Víctor; Martínez Serrano, Francisco; Serna, Arturo



Fecha de publicación:
01/2023
Editorial:
IOP Publishing
Revista:
Astrophysical Journal
ISSN:
0004-637X
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We use two zoom-in ΛCDM hydrodynamical simulations of massive disk galaxies to study the possible existence of fixed satellite groups showing a kinematically coherent behavior across evolution (angular momentum conservation and clustering). We identify three such groups in the two simulations, defining kinematically coherent persistent planes (KPPs) that last at least from virialization to z = 0 (more than 7 Gyr). This proves that orbital pole clustering is not necessarily set in at low redshift, representing a long-lived property of galaxy systems. KPPs are thin and oblate, represent ∼25%-40% of the total number of satellites in the system, and are roughly perpendicular to their corresponding central disk galaxies during certain periods, consistently with Milky Way z = 0 data. KPP satellite members are statistically distinguishable from satellites outside KPPs: they show higher specific orbital angular momenta, orbit more perpendicularly to the central disk galaxy, and have larger pericentric distances than the latter. We numerically prove, for the first time, that KPPs and the best-quality positional planes share the same space configuration across time, such that KPPs act as “skeletons” preventing the latter from being washed out in short timescales. In one of the satellite−host systems, we witness the late capture of a massive dwarf galaxy endowed with its own satellite system, also organized into a KPP configuration prior to its capture. We briefly explore the consequences this event has on the host’s KPP and on the possible enhancement of the asymmetry in the number of satellites rotating in one sense or the opposite within the KPP.
Palabras clave:
DWARF GALAXIES
,
GALAXY PLANES
,
GALAXY KINEMATICS
,
MILKY WAY GALAXY
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Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Santos Santos, Isabel; Gámez Marín, Matías; Dominguez Tenreiro, Rosa; Tissera, Patricia Beatriz; Bignone, Lucas Axel; et al.; Planes of Satellites around Simulated Disk Galaxies. II. Time-persistent Planes of Kinematically Coherent Satellites in ΛCDM; IOP Publishing; Astrophysical Journal; 942; 2; 1-2023; 1-18
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