Substructure depletion in the Milky Way halo by the disk (2009)
D'Onghia, Elena, Springel, Volker, Hernquist, Lars, Keres, Dusan
We employ numerical simulations and simple analytical estimates to argue that dark matter substructures orbiting in the inner regions of the Galaxy can be efficiently destroyed by disk shocking, a...
Resonant stripping as the origin of dwarf spheroidal galaxies (2009)
D'Onghia, Elena, Besla, Gurtina, Cox, Thomas J., Hernquist, Lars
Dwarf spheroidal galaxies are the most dark matter dominated systems in the nearby Universe and their origin is one of the outstanding puzzles of how galaxies form. Dwarf spheroidals are poor in gas...
The Magellanic Group and the Seven Dwarfs (2008)
The Magellanic Clouds were the largest members of a group of dwarf galaxies that entered the Milky Way (MW) halo at late times. This group, dominated by the LMC, contained ~4% of the mass of the...
We use a numerical simulation of a loose group containing a Milky Way halo to probe that in the hierarchical universe the Magellanic Clouds and some dSphs have been accreted into the Milky Way halo...
Small Dwarf Galaxies Within Larger Dwarfs: Why Some Are Luminous While Most Go Dark (2008)
We consider the possibility that the Magellanic Clouds were the largest members of a group of dwarf galaxies that entered the Milky Way (MW) halo at late times. Seven of the eleven brightest...
The Fossil Phase in the Life of a Galaxy Group (2007)
D'Onghia, Elena, Gottloeber, Stefan, Hoeft, Matthias, Khalatyan, Arman, Klypin, Anatoly, ...
We investigate the origin and evolution of fossil groups in a concordance LCDM cosmological simulation. We consider haloes with masses between $(1-5)\times10^{13} \hMsun$ and study the physical...
Do Mergers Spin up Dark Matter Halos? (2007)
D'Onghia, Elena, Navarro, Julio F.
We use a large cosmological N-body simulation to study the origin of possible correlations between the merging history and spin of cold dark matter halos. In particular, we examine claims that...
How galaxies lose their angular momentum (2006)
D'Onghia, Elena, Burkert, Andreas, Murante, Giuseppe, Khochfar, Sadegh
Galaxy Formation and the Cosmological Angular Momentum Problem (2004)
Burkert, Andreas, D'Onghia, Elena
The importance of angular momentum in regulating the sizes of galactic disks and by this their star formation history is highlighted. Tidal torques and accretion of satellites in principle provide...
Bulgeless Galaxies and their Angular Momentum Problem (2004)
D'Onghia, Elena, Burkert, Andreas
The specific angular momentum of Cold Dark Matter (CDM) halos in a $\Lambda$CDM universe is investigated. Their dimensionless specific angular momentum $\lambda'=\frac{j}{\sqrt{2}V_{vir} R{vir}}$...
Cold Dark Matter's Small Scale Crisis Grows Up (2003)
The Cold Dark Matter (CDM) theory predicts a wealth of substructure within dark halos. These predictions match observations of galaxy clusters like the nearby Virgo cluster. However, CDM has a "small...
angular momentum problem in CDM halos Elektronische Daten (2003)
D'Onghia, Elena, Burkert, Andreas, Murante, Giuseppe, Astrophysics Conference
Talk Abstract von Kongress: Star and Structure Formation: From First Light to the Milky Way, Astrophysics Conference, August 18-22, 2003, ETH Zurich, Switzerland
D'Onghia, Elena, Burkert, Andreas
Self-interacting dark matter was proposed by Spergel amp; Steinhardt to alleviate two conflicts between cold dark matter (CDM) models and observations. First, CDM N-body simulations predict dark...
D'Onghia, Elena, Burkert, Andreas
Self-interacting dark matter was proposed by Spergel & Steinhardt (2000) to alleviate two conflicts between Cold Dark Matter (CDM) models and observations. Firstly, CDM N-body simulations predict...
The Halo Density Profiles with Non-Standard N-body Simulations (2002)
D'Onghia, Elena, Firmani, Claudio, Chincarini, Guido
We propose a new numerical procedure to simulate a single dark halo of any size and mass in a hierarchical framework coupling the extended Press-Schechter formalism (EPSF) to N-body simulations. The...
H?; Rotation Curves: The Soft Core Question (2002)
Marchesini, Danilo, D'Onghia, Elena, Chincarini, Guido, Firmani, Claudio, Conconi, Paolo, Molinari, Emilio, ...
Shallow Cores In The Dark Matter Halos: Self-Interaction In Action? (2001)
Vladimir Avila-Reese, Claudio Firmani, Elena D'Onghia, Xavier Hernandez
Using observational data for a sample of dark matter dominated galaxies and two clusters of galaxies, we have found that the central halo density does not depend on its mass, and the core radius is...