IAFE   05512
INSTITUTO DE ASTRONOMIA Y FISICA DEL ESPACIO
Unidad Ejecutora - UE
artículos
Título:
Planes of satellites around simulated disc galaxies: I.- Finding high-quality planar configurations from positional information and their comparison to MW/M31 data
Autor/es:
R. DOMINGUEZ-TENREIRO; BIGNONE, L.; P. B. TISSERA; H. ARTAL; MARTINEZ-SERRANO, F; A. SERNA; I. SANTOS-SANTOS; PEDROSA, S.; M. GOMEZ-FLECHOSO
Revista:
ASTROPHYSICAL JOURNAL
Editorial:
IOP PUBLISHING LTD
Referencias:
Lugar: Londres; Año: 2020 vol. 897
ISSN:
0004-637X
Resumen:
We address the ?plane of satellites problem? by studying planar configurations around two discgalaxies with no late major mergers, formed in zoom-in hydro-simulations. Due to the current lack ofgood quality kinematic data for M31 satellites, we use only positional information. So far, positionalanalyses of simulations are unable to find planes as thin and populated as the observed ones. Moreover,they miss systematicity and detail in the plane-searching techniques, as well as in the study of theproperties and quality of planes, both in simulations or real data. To fill this gap, i) we extend the 4-galaxy-normal density plot method (Pawlowski et al. 2013) in a way designed to efficiently identify thebest quality planes (i.e., thin and populated) without imposing extra constraints on their properties,and ii), we apply it for the first time to simulations. Using zoom-in simulations allows us to mimicMW/M31-like systems regarding the number of satellites involved as well as the galactic disc mass andmorphology, in view of possible disc effects.At all timesteps analyzed in both simulations we find satellite planar configurations that are compatible, along given time intervals, with all the spatial characteristics of observed planes identifiedusing the same methodology. However, the fraction of co-orbiting satellites within them is in generallow, suggesting time-varying satellite membership. We conclude that high-quality positional planesof satellites are not infrequent in ΛCDM-formed disc galaxies with a quiet assembly history. Detecting kinematically-coherent, time-persistent planes demands considering the full six-dimensionalphase-space information of satellites.