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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22 papers · 1 filter
Kinetic Energy Decay Rates of Supersonic and Super-Alfvenic Turbulence in Star-Forming Clouds
Mordecai-Mark Mac Low, Ralf S. Klessen, Andreas Burkert +1
We present numerical studies of compressible, decaying turbulence, with and without magnetic fields, with initial rms Alfven and Mach numbers ranging up to five, and apply the resu…
Dwarf Spheroidal Satellite Galaxies Without Dark Matter: Results From Two Different Numerical Techniques
Ralf Klessen, Pavel Kroupa
Self-consistent simulations of the dynamical evolution of a low-mass satellite galaxy without dark matter are reported. The orbits have eccentricities 0.46 <= e <= 0.96 in a Galact…
The Clustering of K\sim 20 Galaxies on 17 Radio Galaxy Fields
Nathan Roche, Stephen Eales, Hans Hippelein
We investigate the angular correlation function, , of the galaxi es detected in the K-band on 17 fields (101.5 square arcmin in total), each containing a radio ga…
Evidence for Diverse Optical Emission from Gamma-Ray Burst Sources
H. Pedersen, A. O. Jaunsen, T. Grav +25
Optical Transients from gamma-ray burst sources, in addition to offering a distance determination, convey important information on the physics of the emission mechanism, and perhap…
Fragmentation of Molecular Clouds: The Initial Phase of a Stellar Cluster
Ralf S. Klessen, Andreas Burkert
Using smoothed particle hydrodynamics in combination with the special-purpose hardware device GRAPE, we follow the fragmentation process and dynamical evolution in the interior of…
Testing CNO Enrichment Scenarios in Metal-poor Galaxies with HST Spectroscopy
Henry A. Kobulnicky, Evan D. Skillman
Using Hubble Space Telescope ultraviolet and ground-based optical spectroscopy, we measure the C/O and N/O ratios of three metal-poor galaxies with similar metallicity but differin…
The Double Quasar Q2138-431: Lensing by a Dark Galaxy?
M. R. S. Hawkins, D. Clements, J. W. Fried +4
We report the discovery of a new gravitational lens candidate Q2138-431AB, comprising two quasar images at a redshift of 1.641 separated by 4.5 arcsecs. The spectra of the two imag…
Exploring Cluster Ellipticals as Cosmological Standard Rods
R. Bender, R. P. Saglia, B. Ziegler +4
We explore the possibility to calibrate massive cluster ellipticals as cosmological standard rods using the Fundamental Plane relation combined with a correction for luminosity evo…
Dark baryons and rotation curves
A. Burkert, J. Silk
The best measured rotation curve for any galaxy is that of the dwarf spiralXXXX DDO 154, which extends out to about 20 disk scale lengths. It provides an ideal laboratory for testi…
SN 1995ah-the first supernova observed in a Blue Compact Dwarf galaxy
Cristina C. Popescu, Piero Rafanelli, Stefano Benetti +3
We present the properties of the supernova SN 1995ah discovered in a Blue Compact Dwarf galaxy (BCD) around 10 days after the maximum. This is the first supernova event observed in…
Old open clusters: UBGVRI photometry of NGC 2506
G. Marconi, D. Hamilton, M. Tosi +1
UBGVRI photometry for the open cluster NGC 2506 is presented. From comparison of the observed colour-magnitude diagrams with simulations based on stellar evolutionary models we der…
Protostellar fragmentation in a power-law density distribution
A. Burkert, M. Bate, P. Bodenheimer
Hydrodynamical calculations in three space dimensions of the collapse of an isothermal, rotating 1 M\sol protostellar cloud are presented. The initial density stratification is a p…
The Norris Survey of the Corona Borealis Supercluster: II. Galaxy Evolution with Redshift and Environment
Todd A. Small, Wallace L. W. Sargent, Donald Hamilton
We measure the field galaxy luminosity function (LF) as a function of color and redshift from z = 0 to z = 0.5 using galaxies from the Norris Survey of the Corona Borealis Superclu…
Multiwavelength Monitoring of the BL Lacertae Object PKS 2155-304 in May 1994. I. The Ground-Based Campaign
J. E. Pesce, C. M. Urry, L. Maraschi +29
Optical, near-infrared, and radio observations of the BL Lac object PKS2155-304 were obtained simultaneously with a continuous UV/EUV/X-ray monitoring campaign in 1994 May. Further…
X-Rays from Superbubbles in the Large Magellanic Cloud. V. The H II Complex N11
Mordecai-Mark Mac Low, Thomas H. Chang, You-Hua Chu +3
The large H II complex N11 in the Large Magellanic Cloud contains OB associations at several different stages in their life histories. We have obtained ROSAT PSPC and HRI X-ray obs…
GRAPESPH with Fully Periodic Boundary Conditions: Fragmentation of Molecular Clouds
Ralf Klessen
A method of adapting smoothed particle hydrodynamics (SPH) with periodic boundary conditions for use with the special purpose device GRAPE is presented. GRAPE (GRAvity PipE) solves…
Nonlinear Development and Observational Consequences of Wardle C-Shock Instabilities
Mordecai-Mark Mac Low, Michael D. Smith
We compute the nonlinear development of the instabilities in C-shocks first described by Wardle, using a version of the ZEUS code modified to include a semi-implicit treatment of a…
The formation of C-shocks: structure and signatures
Michael D. Smith, Mordecai-Mark Mac Low
Shock waves in molecular clouds should evolve into continuous or C-type structures due to the magnetic field and ion-neutral friction. We here determine whether and how this is ach…
The structure of dark matter halos. Observation versus theory
Andreas Burkert
The rotation curves of dark matter dominated dwarf galaxies are analysed. The observations show that dark matter halos represent a one-parameter family with self similar density pr…
Probing the Warm Gas in High Redshift Radio Galaxies: New Results on the Alignment Effect
Mark J. Neeser, Hans Hippelein, Klaus Meisenheimer
We report on the results of an in depth investigation of the extended [OII]3727 line-emission in 11 3CR radio galaxies (0.5 < z < 1.1). Using a Fabry-Perot etalon to obtain both th…
Beyond HDF - Searching for Early Star Formation in the Infrared
D. Thompson
The success of the Hubble Deep Field (HDF) data in identifying galaxies at redshifts up to ~3 has been quite spectacular. It is possible to extend this to even higher redshifts usi…
Phase-resolved spectroscopy and photometry of the eclipsing polar EP Draconis (=H1907+690)
Axel D. Schwope, Sabine Mengel
We present phase-resolved optical spectroscopy and CCD photometry of the faint eclipsing polar EP Dra (H1907+690). A revised ephemeris is derived which connects all 32000 binary cy…