IALP   13078
INSTITUTO DE ASTROFISICA LA PLATA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Characterising the relevance of chaos in shaping the phase space structure of Milky way -- like stellar haloes in the Neighbourhood of the Sun
Autor/es:
N. P. MAFFIONE; F.A. GOMEZ; P. M. CINCOTTA; C.M. GIORDANO; A. P. COOPER; B.W. O'SHEA
Lugar:
Santiago
Reunión:
Workshop; Satellites and Streams in Santiago; 2015
Institución organizadora:
European Southern Observatory (ESO)
Resumen:
We demonstrate that diffusion due to chaotic mixing in the
Neighbourhood of the Sun is not as relevant as previously suggested in
erasing phase space signatures of past Galactic accretion events. For this
purpose, we analyse Solar Neighbourhood--like volumes extracted from
cosmological simulations that naturally account for chaotic orbital
behaviour induced by the strongly triaxial and cuspy shape of the resulting
dark matter haloes, among other factors. Our results show that a large
fraction of stellar halo particles in such local volumes have chaos onset
times (i.e., the timescale at
which stars commonly associated with chaotic orbits will exhibit their chaotic behaviour) significantly larger than a Hubble time. Furthermore, particles that do present a chaotic behaviour within a Hubble time do not exhibit significant
diffusion in phase space.