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On the Formation of Boxy and Disky Elliptical Galaxies
A. Burkert, Th. Naab
N-body simulations of major spiral-spiral mergers with different mass ratios q <= 4:1 are presented. All mergers lead to spheroidal stellar systems with de Vaucouleurs-like surface…
Emission Spectra of Fallback Disks Around Young Neutron Stars
Rosalba Perna, Lars Hernquist, Ramesh Narayan
The nature of the energy source powering anomalous X-ray pulsars is uncertain. Proposed scenarios involve either an ultramagnetized neutron star, or accretion onto a neutron star.…
An Accretion Model for Anomalous X-Ray Pulsars
Pinaki Chatterjee, Lars Hernquist, Ramesh Narayan
We present a model for the anomalous X-ray pulsars (AXPs) in which the emission is powered by accretion from a fossil disk, established from matter falling back onto the neutron st…
On the Formation of Boxy and Disky Elliptical Galaxies
Thorsten Naab, Andreas Burkert, Lars Hernquist
The origin of boxy and disky elliptical galaxies is investigated. The results of two collisionless N-body simulations of spiral-spiral mergers with mass ratios of 1:1 and 3:1 are d…
Evolution of the Galactic Potential and Halo Streamers with Future Astrometric Satellites
HongSheng Zhao, Kathryn Johnston, Lars Hernquist +1
ESA's Global Astrometric Interferometer for Astrophysics (GAIA) holds the promise of mapping out the detailed phase space structure of the Galactic halo by providing unprecedented…
The Effects of Gas Dynamics, Cooling, Star Formation, and Numerical Resolution in Simulations of Cluster Formation
G. F. Lewis, A. Babul, N. Katz +3
We present the analysis of a suite of simulations of a Virgo mass galaxy cluster. Undertaken within the framework of standard cold dark matter cosmology, these simulations were per…