14.6k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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57 papers · 1 filter
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…
On the Formation of Helium Double Degenerate Stars and Pre-Cataclysmic Variables
Eric L. Sandquist, Ronald E. Taam, Andreas Burkert
The evolution of low mass (M < 2.5 Msun) binaries through the common envelope phase has been studied for systems in which one member is on its first ascent of the red giant branch.…
Binary Black Hole Mergers from Planet-like Migrations
Andrew Gould, Hans-Walter Rix
If supermassive black holes (BHs) are generically present in galaxy centers, and if galaxies are built up through hierarchical merging, BH binaries are at least temporary features…
Silicate Emission in T Tauri Stars: Evidence for Disk Atmospheres?
Antonella Natta, Michael R. Meyer, Steven V. W. Beckwith
We present low-resolution mid-infrared spectra of nine classical T Tauri stars associated with the Chamaeleon I dark cloud. The data were obtained with the PHOT-S instrument on-boa…
SCUBA observations of NGC 6946
S. Bianchi, J. Davies, P. Alton +2
We present sub-millimetre images of the spiral galaxy NGC 6946 at 450 and 850 um. The observations have been carried out using the scan/map imaging mode of the Sub-millimetre Commo…
Centers of Barred Galaxies: Secondary Bars and Gas Flows
Witold Maciejewski
Active Galactic Nuclei (AGN) require mass accretion onto the central engine. On large galactic scales, torques from a stellar bar can efficiently remove angular momentum from gas,…
A wide field survey at the Northern Ecliptic Pole I: Number counts and angular correlation functions in K
M. W. Kuemmel, S. J. Wagner
We present the results from a multi colour survey performed at the Northern Ecliptic Pole (NEP). The survey is designed to identify the counterparts of faint sources from the ROSAT…
The Effect of the Outer Lindblad Resonance of the Galactic Bar on the Local Stellar Velocity Distribution
Walter Dehnen
Hydro-dynamical modeling of the inner Galaxy suggest that the radius of the outer Lindblad resonance (OLR) of the Galactic bar lies in the vicinity of the Sun. How does this resona…
MHD Turbulence in Star-Forming Clouds
Mordecai-Mark Mac Low, Ralf Klessen, Fabian Heitsch
We review how supersonic turbulence can both prevent and promote the collapse of molecular clouds into stars. First we show that decaying turbulence cannot significantly delay coll…
The ALFA Laser: Beam Relay and Control System
T. Ott, W. Hackenberg, S. Rabien +2
The ALFA laser subsystem uses a 4 watt continuous wave laser beam to produce an artificial guide star in the mesospheric sodium layer as a reference for wavefront sensing. In this…
The ALFA Laser and Analysis Tools
S. Rabien, T. Ott, W. Hackenberg +4
The optimal performance of adaptive optics systems can only be maintained if the wavefront reference is bright and compact. Experience has shown that both of these important criter…
The ALFA laser guide star: Operation and Results
R. Davies, A. Eckart, W. Hackenberg +4
The importance of laser guide stars to the practical usefulness of adaptive optics cannot be understated, and yet there are very few working systems. This contribution discusses th…
Gravitational Collapse in Turbulent Molecular Clouds. I. Gasdynamical Turbulence
Ralf S. Klessen, Fabian Heitsch, Mordecai-Mark Mac Low
Observed molecular clouds often appear to have very low star formation efficiencies and lifetimes an order of magnitude longer than their free-fall times. Their support is attribut…
Evidence for Large Scale Structure in the Lyman alpha Forest at z>2.6
G. M. Williger, A. Smette, C. Hazard +2
We present a search for spatial and redshift correlations in a 2 A resolution spectroscopic survey of the Lyman alpha forest at 2.15 < z < 3.37 toward ten QSOs concentrated within…
Constraints on the Space Density of Methane Dwarfs and the Substellar Mass Function from a Deep Near-Infrared Survey
T. M. Herbst, D. Thompson, R. Fockenbrock +2
We report preliminary results of a deep near-infrared search for methane-absorbing brown dwarfs; almost five years after the discovery of Gl 229b, there are only a few confirmed ex…
Host Galaxies of Lensed Luminous Quasars at z~2
H. -W. Rix, E. Falco, C. Impey +5
We present H-band observations of gravitationally lensed QSO host galaxies obtained with NICMOS on HST as part of the CfA-Arizona-Gravitational-Lens-Survey (CASTLES). The detection…
The Evolution of Gravitational Lens Galaxies
C. S. Kochanek, E. E. Falco, C. D. Impey +6
Most gravitational lens galaxies are early-type galaxies in relatively low density environments. We show that they lie on the same fundamental plane as early-type galaxies in both…
Galactic Bulges from HST-NICMOS Observations: Ages and Dust
Reynier Peletier, Marc Balcells, Roger Davies +4
We present optical and near-infrared colour maps of the central regions of bulges of S0 and spiral galaxies obtained with WFPC2 and NICMOS on the HST. By combined use of HST and gr…
The Migration and Growth of Protoplanets in Protostellar Discs
Richard P. Nelson, John C. B. Papaloizou, F. Masset +1
We investigate the gravitational interaction of a Jovian mass protoplanet with a gaseous disc with aspect ratio and kinematic viscosity expected for the protoplanetary disc from wh…
Inhomogeneous Chemical Evolution of the Galactic Halo
C. Travaglio, A. Burkert, D. Galli
We describe the basic features of a Monte Carlo model specifically designed to follow the inhomogenous chemical evolution of the Galactic halo, taking into account the effects of l…
Keck Spectra of Brown Dwarf Candidates and a Precise Determination of the Lithium Depletion Boundary in the Alpha Persei Open Cluster
J. R. Stauffer, D. Barrado y Navascués, J. Bouvier +8
We have identified twenty-seven candidate very low mass members of the relatively young Alpha Persei open cluster from a six square degree CCD imaging survey. Based on their I magn…
HST Observations of 10 Two-Image Gravitational Lenses
J. Lehar, E. Falco, C. Kochanek +6
We report on a program to obtain HST observations of galaxy-mass gravitational lens systems at optical and infrared wavelengths. Here we discuss the properties of 10 two-image grav…
The Fundamental Plane of Gravitational Lens Galaxies and The Evolution of Early-Type Galaxies in Low Density Environments
C. S. Kochanek, E. E. Falco, C. D. Impey +6
Most gravitational lenses are early-type galaxies in relatively low density environments -- a ``field'' rather than a ``cluster'' population. We show that field early-type galaxies…
Towards Understanding Jovian Planet Migration
Andrew F. Nelson, Willy Benz
We present 2D hydrodynamic simulations of circumstellar disks around protostars using a `Piecewise Parabolic Method' (PPM) code. We include a point mass embedded within the disk an…