THE DUAL ORIGIN OF STELLAR HALOS

@article{Zolotov2009THEDO,
  title={THE DUAL ORIGIN OF STELLAR HALOS},
  author={A. M. Zolotov and Beth Willman and Alyson M. Brooks and Fabio Governato and Chris B. Brook and David W. Hogg and Thomas R. Quinn and Greg Stinson},
  journal={The Astrophysical Journal},
  year={2009},
  volume={702},
  pages={1058 - 1067},
  url={https://api.semanticscholar.org/CorpusID:16591772}
}
We investigate the formation of the stellar halos of four simulated disk galaxies using high-resolution, cosmological SPH + N-body simulations. These simulations include a self-consistent treatment of all the major physical processes involved in galaxy formation. The simulated galaxies presented here each have a total mass of ∼1012 M☉, but span a range of merger histories. These simulations allow us to study the competing importance of in situ star formation (stars formed in the primary galaxy… 
View on IOP Publishing
[PDF] Semantic Reader
236 Citations
Highly Influential Citations
14
Background Citations
156
Methods Citations
27
Results Citations
13

236 Citations

THE DUAL ORIGIN OF STELLAR HALOS. II. CHEMICAL ABUNDANCES AS TRACERS OF FORMATION HISTORY

Fully cosmological, high-resolution N-body+smooth particle hydrodynamic simulations are used to investigate the chemical abundance trends of stars in simulated stellar halos as a function of their…

Cosmological simulations of the formation of the stellar haloes around disc galaxies

We use the Galaxies-Intergalactic Medium Interaction Calculation (GIMIC) suite of cosmological hydrodynamical simulations to study the formation of stellar spheroids of Milky Way mass disc galaxies.…

Stellar halos in Illustris: probing the histories of Milky Way-mass galaxies

The existence of stellar halos around galaxies is a natural prediction of the hierarchical nature of the LambdaCDM model. Recent observations of Milky Way-like galaxies have revealed a wide range in…

Galactic stellar haloes in the CDM model

We present six simulations of galactic stellar haloes formed by the tidal disruption of accreted dwarf galaxies in a fully cosmological setting. Our model is based on the Aquarius project, a suite of…

Formation of in situ stellar haloes in Milky Way-mass galaxies

We study the formation of stellar haloes in three Milky Way-mass galaxies using cosmological smoothed particle hydrodynamics simulations, focusing on the subset of halo stars that form in situ, as…

Chemical signatures of formation processes in the stellar populations of simulated galaxies

We study the chemical properties of the stellar populations in eight simulations of the formation of Milky Way mass galaxies in a Λ cold dark matter universe. Our simulations include metal-dependent…

The stellar mass assembly of galaxies in the Illustris simulation: growth by mergers and the spatial distribution of accreted stars

We use the Illustris simulation to study the relative contributions of in situ star formation and stellar accretion to the build-up of galaxies over an unprecedentedly wide range of masses (M_* =…

Global structure and kinematics of stellar haloes in cosmological hydrodynamic simulations

We use the Galaxies–Intergalactic Medium Interaction Calculation (GIMIC) suite of cosmological hydrodynamical simulations to study the global structure and kinematics of stellar spheroids of Milky…

The origin of galactic metal-rich stellar halo components with highly eccentric orbits

Using the astrometry from the ESA’s Gaia mission, previous works have shown that the Milky Way stellar halo is dominated by metal-rich stars on highly eccentric orbits. To shed light on the nature of…

Building galaxies by accretion and in-situ star formation

We examine galaxy formation in a cosmological AMR simulation, which includes two high resolution boxes, one centered on a 3 × 10 14 M⊙ cluster, and one centered on a void. We examine the evolution of…
...

48 References

Stars beyond galaxies: the origin of extended luminous haloes around galaxies

We use numerical simulations to investigate the origin and structure of the luminous haloes that surround isolated galaxies. These stellar structures extend out to several hundred kpc away from a…

Tracing Galaxy Formation with Stellar Halos. II. Relating Substructure in Phase and Abundance Space to Accretion Histories

This paper explores the mapping between the observable properties of a stellar halo in phase and abundance space and the parent galaxy’s accretion history in terms of the characteristic epoch of…

Chemical Abundance Distributions of Galactic Halos and Their Satellite Systems in a ΛCDM Universe

We present a cosmologically motivated model for the hierarchical formation of the stellar halo that includes a semianalytic treatment of galactic chemical enrichment coupled to numerical simulations…

The formation of disk galaxies in computer simulations

The suppression of bulge formation is related to the physics of galaxy formation during the merger of the most massive protogalactic lumps at high redshift, where the reionization of the Universe likely plays a key role.

Tracing Galaxy Formation with Stellar Halos. I. Methods

If the favored hierarchical cosmological model is correct, then the Milky Way system should have accreted ~100-200 luminous satellite galaxies in the past ~12 Gyr. We model this process using a…

Galactic Halo Stars in Phase Space: A Hint of Satellite Accretion?

The present-day chemical and dynamical properties of the Milky Way bear the imprint of the Galaxy's formation and evolutionary history. One of the most enduring and critical debates surrounding…

Forming disc galaxies in ΛCDM simulations

We used fully cosmological, high-resolution N-body + smooth particle hydrodynamic (SPH) simulations to follow the formation of disc galaxies with rotational velocities between 135 and 270km s -1 in a…

THE ROLE OF COLD FLOWS IN THE ASSEMBLY OF GALAXY DISKS

We use high-resolution cosmological hydrodynamical simulations to demonstrate that cold flow gas accretion, particularly along filaments, modifies the standard picture of gas accretion and cooling…

Two stellar components in the halo of the Milky Way

It is shown that the halo is indeed clearly divisible into two broadly overlapping structural components—an inner and an outer halo—that exhibit different spatial density profiles, stellar orbits and stellar metallicities (abundances of elements heavier than helium).

The Progenitors of Dwarf Spheroidal Galaxies

The gas-deficient dwarf spheroidal (dSph) galaxies present an evolutionary puzzle that we explore in 40 early-type and late-type dwarfs in the Local Group and nearby field. Although dSph's…