Bibcode
Artale, M. C.; Pedrosa, S. E.; Tissera, P. B.; Cataldi, P.; Di Cintio, A.
Bibliographical reference
Astronomy and Astrophysics, Volume 622, id.A197, 17 pp.
Advertised on:
2
2019
Journal
Citations
19
Refereed citations
17
Description
Aims: It is well known that the presence of baryons affects the
dark matter host haloes. Exploring the galaxy assembly history together
with the dark matter haloes properties through time can provide a way to
measure these effects. Methods: We have studied the properties of
four Milky Way mass dark matter haloes from the Aquarius project during
their assembly history, between z = 0 - 4. In this work, we used a
published SPH run and the dark matter only counterpart as case studies.
To asses the robustness of our findings, we compared them with one of
the haloes run using a moving-mesh technique and different sub-grid
scheme. Results: Our results show that the cosmic evolution of
the dark matter halo profiles depends on the assembly history of the
baryons. We find that the dark matter profiles do not significantly
change with time, hence they become stable, when the fraction of baryons
accumulated in the central regions reaches 80 per cent of its present
mass within the virial radius. Furthermore, the mass accretion history
shows that the haloes that assembled earlier are those that contain a
larger amount of baryonic mass aforetime, which in turn allows the dark
matter halo profiles to reach a stable configuration earlier. For the
SPH haloes, we find that the specific angular momentum of the dark
matter particles within the five per cent of the virial radius at z = 0,
remains approximately constant from the time at which 60 per cent of the
stellar mass is gathered. We have explored different theoretical and
empirical models for the contraction of the haloes through redshift. A
model to better describe the contraction of the haloes through redshift
evolution must depend on the stellar mass content in the inner regions.
Related projects
Numerical Astrophysics: Galaxy Formation and Evolution
How galaxies formed and evolved through cosmic time is one of the key questions of modern astronomy and astrophysics. Cosmological time- and length-scales are so large that the evolution of individual galaxies cannot be directly observed. Only through numerical simulations can one follow the emergence of cosmic structures within the current
Claudio
Dalla Vecchia
Traces of Galaxy Formation: Stellar populations, Dynamics and Morphology
We are a large, diverse, and very active research group aiming to provide a comprehensive picture for the formation of galaxies in the Universe. Rooted in detailed stellar population analysis, we are constantly exploring and developing new tools and ideas to understand how galaxies came to be what we now observe.
Ignacio
Martín Navarro