The Alpha-Group collaboration (2008)
Guy Dimonte, D. L. Youngs, A. Dimits, S. Weber, M. Marinak, S. Wunsch, ...
numerical simulations:
Large-wavelength instabilities in free-surface Hartmann flow at low magnetic Prandtl numbers (2008)
Giannakis, D., Rosner, R., Fischer, P.
We study the linear stability of the flow of a viscous electrically conducting capillary fluid on a planar fixed plate in the presence of gravity and a uniform magnetic field. We first confirm that...
Strongly compressible current sheets under gravitation (2008)
Vainshtein, S. I., Mikic, Z., Rosner, R., Sagdeev, R. Z.
Many stormy events in astrophysics occur due to the sudden magnetic energy release. This is possible if a magnetic configuration abruptly changes its topology, an event usually referred to as...
Astronomy Astrophysics manuscript no. 2896 30th August 2005 (2008)
Doi Will Be, S. Orl, G. Peres, F. Reale, F. Bocchino, R. Rosner, ...
We model the hydrodynamic interaction of a shock wave of an evolved supernova remnant with a small interstellar gas cloud like the ones observed in the Cygnus loop and in the Vela SNR. We investigate...
G. Micela, S. Sciortino, F. R. Harnden, V. Kashyap, R. Rosner, F. Damiani, ...
A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are:
A. C. Calder, B. C. Curtis, L. J. Dursi, B. Fryxell, G. Henry, P. Macneice, ...
We present simulations and performance results of nuclear burning fronts in supernovae on the largest domain and at the nest spatial resolution studied to date. These simulations were performed on...
X-Ray Source Detection: Pixons And Wavelets (2007)
V. Kashyap, P. Freeman, R. Puetter, R. Puetter (ucsd, R. Rosner
INTRODUCTION Significant advances in X-ray source detection techniques have been made recently with the development of wavelet-based and information -content--based techniques: The former method...
X-Ray Variability And Rotation In The Pleiades Cluster (2007)
Micela And, G. Micela, S. Sciortino, F. R. Harnden, R. Rosner
Introduction The issue of coronal emission variability is one of the current problems of stellar physics. The Sun exhibits large variability in X-rays with amplitude of more than one order of...
Orlando And Reale, G. Peres, F. Reale, R. Rosner
The aim of this paper is to validate a methodology for connecting the emission measure of individual solar coronal loops to the integrated emission measure of the entire solar corona, and using this...
Zanni, C., Ferrari, A., Rosner, R., Bodo, G., Massaglia, S.
Accretion disks and astrophysical jets are used to model many active astrophysical objects, viz., young stars, relativistic stars, and active galactic nuclei. In this paper we present self-consistent...
X-rays from protostellar jets: emission from continuous flows (2006)
Bonito, R., Orlando, S., Peres, G., Favata, F., Rosner, R.
Recently X-ray emission from protostellar jets has been detected with both XMM-Newton and Chandra satellites, but the physical mechanism which can give rise to this emission is still unclear. We...
Crushing of interstellar gas clouds in supernova remnants II. X-ray emission (2006)
Orlando, S., Bocchino, F., Peres, G., Reale, F., Plewa, T., Rosner, R.
AIMS. We study and discuss the time-dependent X-ray emission predicted by hydrodynamic modeling of the interaction of a SNR shock wave with an interstellar gas cloud. The scope includes: 1) to study...
Astronomy Astrophysics manuscript no. paper c ESO 2006 (2006)
Th June Crushing, S. Orl, F. Bocchino, G. Peres, F. Reale, T. Plewa, ...
Context. X-ray observations of evolved supernova remnants (e.g. the Cygnus loop and the Vela SNRs) reveal emission originating from the interaction of shock waves with small interstellar gas clouds.
Orlando, S., Peres, G., Reale, F., Bocchino, F., Rosner, R., Plewa, T., ...
We model the hydrodynamic interaction of a shock wave of an evolved supernova remnant with a small interstellar gas cloud like the ones observed in the Cygnus loop and in the Vela SNR. We investigate...
Morphology of Rising Hydrodynamic and Magneto-hydrodynamic Bubbles from Numerical Simulations (2003)
Robinson, K., Dursi, L. J., Ricker, P. M., Rosner, R., Calder, A. C., Zingale, M., ...
Recent Chandra and XMM-Newton observations of galaxy cluster cooling flows have revealed X-ray emission voids of up to 30 kpc in size that have been identified with buoyant, magnetized bubbles....
On Heavy Element Enrichment in Classical Novae (2003)
Alexakis, A., Calder, A. C., Heger, A., Brown, E. F., Dursi, L. J., Truran, J. W., ...
Many classical nova ejecta are enriched in CNO and Ne. Rosner et al. recently suggested that the enrichment might originate in the resonant interaction between large-scale shear flows in the accreted...
The Response of Model and Astrophysical Thermonuclear Flames to Curvature and Stretch (2003)
Dursi, L. J., Zingale, M., Calder, A. C., Fryxell, B., Timmes, F. X., Vladimirova, N., ...
Critically understanding the `standard candle'-like behavior of Type Ia supernovae requires understanding their explosion mechanism. One family of models for Type Ia Supernovae begins with a...
Model Flames in the Boussinesq Limit: The Effects of Feedback (2002)
We have studied the fully nonlinear behavior of pre-mixed flames in a gravitationally stratified medium, subject to the Boussinesq approximation. Key results include the establishment of criterion...
Investigations of Pointwise Ignition of Helium Deflagrations on Neutron Stars (2002)
Zingale, M., Woosley, S. E., Cumming, A., Calder, A., Dursi, L. J., Fryxell, B., ...
We look at the spreading of localized temperature perturbations in the accreted fuel layer of a non-rotating neutron star. The pressure at the base of the accreted fuel layer is large and the...
Mapping Initial Hydrostatic Models in Godunov Codes (2002)
Zingale, M., Dursi, L. J., ZuHone, J., Calder, A. C., Fryxell, B., Plewa, T., ...
We look in detail at the process of mapping an astrophysical initial model from a stellar evolution code onto the computational grid of an explicit, Godunov type code while maintaining hydrostatic...
Onset of Convectionon a Pre-Runaway White Dwarf (2002)
Dursi, L. J., Calder, A. C., Alexakis, A., Truran, J. W., Rosner, R., Zingale, M., ...
Observed novae abundances and explosion energies estimated from observations indicate that there must be significant mixing of the heavier material of the white dwarf (C+O) into the lighter accreted...
Mixing by Non-linear Gravity Wave Breaking on a White Dwarf Surface (2002)
Calder, A. C., Alexakis, A., Dursi, L. J., Rosner, R., Truran, J. W., Ricker, B. Fryxell P., ...
We present the results of a simulation of a wind-driven non-linear gravity wave breaking on the surface of a white dwarf. The ``wind'' consists of H/He from an accreted envelope, and the simulation...
On Validating an Astrophysical Simulation Code (2002)
Calder, A. C., Fryxell, B., Plewa, T., Rosner, R., Dursi, L. J., Weirs, V. G., ...
We present a case study of validating an astrophysical simulation code. Our study focuses on validating FLASH, a parallel, adaptive-mesh hydrodynamics code for studying the compressible, reactive...
Sloan Digital Sky Survey: Early data release (2002)
Stoughton, C., Lupton, R. H., Bernardi, M., Blanton, M. R., Burles, S., Castander, F. J., ...
The Sloan Digital Sky Survey (SDSS) is an imaging and spectroscopic survey that will eventually cover approximately one-quarter of the celestial sphere and collect spectra of 10 6 galaxies, 100,000...
Alan Calder, B. Fryxell, T. Plewa, R. Rosner, J. Dursi, G. Weirs, ...
❑ Summary, conclusions, and spear catching
The distribution of emission measure, and of heating budget, among the loops in the corona (2001)
Peres, G., Orlando, S., Reale, F., Rosner, R.
The aim of this paper is to validate a methodology for connecting the emission measure of individual solar coronal loops to the integrated emission measure of the entire solar corona, and using this...
On the C/O Enrichment of Novae Ejecta (2001)
Rosner, R., Alexakis, A., Young, Y., Truran, J., Hillebrandt, W.
Using the results of recent work in shear instabilities in stratified fluids, we show that the resonant interaction between large-scale flows in the accreted H/He envelope of white dwarf stars and...
On the shear instability of fluid interfaces (2001)
Alexakis, A., Young, Y., Rosner, R.
We examine the linear stability of fluid interfaces subjected to a shear flow. Our main object is to generalize previous work to arbitrary Atwood number, and to allow for surface tension and weak...
On the miscible Rayleigh-Taylor instability: two and three dimensions (2001)
Young, Y., Tufo, H., Dubey, A., Rosner, R.
We investigate the miscible Rayleigh-Taylor (RT) instability in both 2 and 3 dimensions using direct numerical simulations, where the working fluid is assumed incompressible under the Boussinesq...
Plasmoid impacts on neutron stars and highest energy cosmic rays (2001)
Particle acceleration by electrostatic polarization fields that arise in plasmas streaming across magnetic fields is discussed as a possible acceleration mechanism of highest-energy cosmic rays....
On a mechanism of highest-energy cosmic ray acceleration (2001)
A recently proposed mechanism of acceleration of highest energy cosmic rays by polarization electric fields arising in plasmoids injected into neutron star magnetospheres is discussed.
Simulations of Astrophysical Fluid Instabilities (2001)
Calder, A. C., Fryxell, B., Rosner, R., Dursi, L. J., Olson, K., Ricker, P. M., ...
We present direct numerical simulations of mixing at Rayleigh-Taylor unstable interfaces performed with the FLASH code, developed at the ASCI/Alliances Center for Astrophysical Thermonuclear Flashes...
Ballooning Instability in Polar Caps of Accreting Neutron Stars (2001)
Litwin, C., Brown, Edward F., Rosner, R.
We assess the stability of Kruskal-Schwarzschild (magnetic Rayleigh-Taylor) type modes for accreted matter on the surface of a neutron star confined by a strong (>= 1.E12 G) magnetic field. Employing...
Large-Scale Simulations of Clusters of Galaxies (2000)
Ricker, P. M., Calder, A. C., Dursi, L. J., Fryxell, B., Lamb, D. Q., MacNeice, P., ...
We discuss some of the computational challenges encountered in simulating the evolution of clusters of galaxies. Eulerian adaptive mesh refinement (AMR) techniques can successfully address these...
Kelvin-Helmholtz instability in three dimensional radiative jets (2000)
Micono, M., Bodo, G., Massaglia, S., Rossi, P., Ferrari, A., Rosner, R.
The analysis of the stability properties of astrophysical jets against Kelvin-Helmholtz (or shear-layer) instabilities plays a basic role in the understanding the origin and physical characteristics...
Evidence for topological nonequilibrium in magnetic configurations (2000)
Vainshtein, S. I., Mikić, Z., Rosner, R., Linker, J. A.
We use direct numerical simulations to study the evolution, or relaxation, of magnetic configurations to an equilibrium state. We use the full single-fluid equations of motion for a magnetized,...
The unoccupied electronic structure of Li2CuO2 (1999)
Neudert, R., Rosner, R., Kielwein, M., Sing, M., Knupfer, M., ...
We investigate the miscible Rayleigh–Taylor (RT) instability in both two and three dimensions using direct numerical simulations, where the working fluid is assumed incompressible under the...
X-Ray Source Detection Using the Wavelet Transform (1996)
George H. Jacoby, Jeannette Barnes, P.E. Freeman, V. Kashyap, R. Rosner, R. Nichol, ...
. We present a new method that uses the Mexican Hat wavelet transform in a particularly simple manner to detect X-ray sources. We use an iterative approach to correlate data with the Mexican Hat...
Klemperer, W, Luo, X, Rosner, R, Schramm, D N
Possible instabilities during cosmological recombination may produce an epoch of nonlinear density growth and fractal-like structural patterns out to the horizon scale at that epoch (approximately...
Schramm, D N, Rosner, R, Luo, X, Klemperer, W
Given a specific physical mechanism for instabilities during cosmological recombination discussed in an earlier paper, we examine the nonlinear growth of density structures to form fractal-like...
Grouping of beta-hemolytic streptococcal isolates by staphylococcal coagglutination was performed with the Phadebact Streptococcus Test to determine whether such isolates could be accurately grouped...
By using parallel culture techniques, the recovery rates of a wide spectrum of organisms encountered in hypertonic clinical blood cultures was determined from four different blood culture bottles....
The association of marijuana use with outcome of pregnancy.
Linn, S, Schoenbaum, S C, Monson, R R, Rosner, R, Stubblefield, P C, Ryan, K J
We analyzed interview and medical record data of 12,424 women to evaluate the relationship between marijuana usage and adverse outcomes of pregnancy. Low birthweight, short gestation, and major...
Klemperer, W, Luo, X, Rosner, R, Schramm, D N
Possible instabilities during cosmological recombination may produce an epoch of nonlinear density growth and fractal-like structural patterns out to the horizon scale at that epoch (approximately...
Schramm, D N, Rosner, R, Luo, X, Klemperer, W
Given a specific physical mechanism for instabilities during cosmological recombination discussed in an earlier paper, we examine the nonlinear growth of density structures to form fractal-like...
Grouping of beta-hemolytic streptococcal isolates by staphylococcal coagglutination was performed with the Phadebact Streptococcus Test to determine whether such isolates could be accurately grouped...
By using parallel culture techniques, the recovery rates of a wide spectrum of organisms encountered in hypertonic clinical blood cultures was determined from four different blood culture bottles....
The association of marijuana use with outcome of pregnancy.
Linn, S, Schoenbaum, S C, Monson, R R, Rosner, R, Stubblefield, P C, Ryan, K J
We analyzed interview and medical record data of 12,424 women to evaluate the relationship between marijuana usage and adverse outcomes of pregnancy. Low birthweight, short gestation, and major...