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33 papers · 2 filters
Measurement of Relativistic Orbital Decay in the PSR B1534+12 Binary System
I. H. Stairs, Z. Arzoumanian, F. Camilo +5
We have made timing observations of binary pulsar PSR B1534+12 with radio telescopes at Arecibo, Green Bank, and Jodrell Bank. By combining our new observations with data collected…
Parity Violation in Neutrino Transport and the Origin of Pulsar Kicks
Dong Lai, Y. -Z. Qian
In proto-neutron stars with strong magnetic fields, the neutrino-nucleon scattering/absorption cross sections depend on the direction of neutrino momentum with respect to the magne…
The Radial Extent and Warp of the Ionized Galactic Disk. I. A VLBA Survey of Extragalactic Sources Toward the Anticenter
T. Joseph W. Lazio, James M. Cordes
We report multifrequency Very Long Baseline Array observations of twelve active galactic nuclei seen toward the Galactic anticenter. All of the sources are at |b| < 10 degrees and…
The Radial Extent and Warp of the Ionized Galactic Disk. II. A Likelihood Analysis of Radio-Wave Scattering Toward the Anticenter
T. Joseph W. Lazio, James M. Cordes
We use radio-wave scattering data to constrain the distribution of ionized gas in the outer Galaxy. Like previous models, our model for the H II disk includes parameters for the ra…
Seeking the Local Convergence Depth. II. TF Observations of the Clusters A114, A119, A194, A2295, A2457, A2806, A3193, A3381, AND A3744
Daniel A. Dale, Riccardo Giovanelli, Martha P. Haynes +3
We present Tully-Fisher (TF) observations for nine rich Abell clusters of galaxies. This is the second such data installment of an all-sky survey of 50 clusters in the redshift ran…
Transonic Magnetic Slim Accretion Disks and kilo-Hertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
Dong Lai
The inner regions of accretion disks of weakly magnetized neutron stars are affected by general relativity and stellar magnetic fields. Even for field strengths sufficiently small…
Type I Superconductivity in Neutron Stars
D. M. Sedrakian, A. Sedrakian, G. F. Zharkov
The magnetic structure of neutron vortices in the superfluid cores of neutron stars is determined assuming that the proton condensate forms a type I superconductor. It is shown tha…
ISO measurements of [CII] line variations in galaxies
S. Malhotra, G. Helou, G. Stacey +11
We report measurements of the [CII] fine structure line at 157.714 micron in 30 normal star-forming galaxies with the Long Wavelength Spectrometer (LWS) on the Infrared Space Obser…
Generation of Pulsar Glitches: A Superfluid Core Model
A. Sedrakian, J. Cordes
We show that the neutron star's crust-core interface acts as a potential barrier on the peripheral neutron vortices approaching this interface and thus prevents their continuous de…
Observations of a Correlated Gamma-Ray and Optical Flare for BL Lacertae
S. D. Bloom
The latest observations of BL Lacertae with the EGRET instrument on CGRO show that the gamma-ray flux was four times higher than the previous detection. Within the 1997 July 15-22…
Effects of magnetic fields on radiatively overstable shock waves
Paul A. Kimoto, David F. Chernoff
We discuss high-resolution simulations of one-dimensional, plane-parallel shock waves with mean speeds between 150 and 240 km/s propagating into gas with Alfven velocities up to 40…
Comparison of the SFI Peculiar Velocities with the IRAS 1.2 Jy Gravity Field
Luiz N. da Costa, Adi Nusser, Wolfram Freudling +4
We present a comparison between the peculiar velocity fields measured from the SFI all-sky Sbc-Sc Tully-Fisher catalog and that derived from the \iras 1.2 Jy redshift survey galaxy…
Neutron Star Population Dynamics.II: 3D Space Velocities of Young Pulsars
J. M. Cordes, David F. Chernoff
We use astrometric, distance and spindown data on pulsars to: (1) estimate three-dimensional velocity components, birth distances from the galactic plane, and ages of individual ob…
Carbon recombination lines in the Orion Bar
F. Wyrowski, P. Schilke, P. Hofner +1
We have carried out VLA D-array observations of the C91alpha carbon recombination line as well as Effelsberg 100-m observations of the C65alpha line in a 5 arcmin square region cen…
Scintillation-Induced Intermittency in SETI
James M. Cordes, T. Joseph W. Lazio, Carl Sagan
We consider interstellar scintillations as a cause of intermittency in radio signals from extraterrestrial intelligence (ETI). We demonstrate that scintillations are very likely to…
Bayesian Analysis of the Polarization of Distant Radio Sources: Limits on Cosmological Birefringence
Thomas J. Loredo, Eanna E. Flanagan, Ira M. Wasserman
A recent study of the rotation of the plane of polarization of light from 160 cosmological sources claims to find significant evidence for cosmological anisotropy. We point out met…
X-ray Emission from the Guitar Nebula
Roger W. Romani, James M. Cordes, I. -A. Yadigaroglu
We have detected weak soft X-ray emission from the Pulsar Wind Nebula trailing the high velocity star PSR 2224+65 (the `Guitar Nebula'). This X-ray flux gives evidence of γ~10^7 eV…
Post-Newtonian Models of Binary Neutron Stars
James C. Lombardi, Frederic A. Rasio, Stuart L. Shapiro
Using an energy variational method, we calculate quasi-equilibrium configurations of binary neutron stars modeled as compressible triaxial ellipsoids obeying a polytropic equation…
Neutron Star Population Dynamics.I: Millisecond Pulsars
J. M. Cordes, David F. Chernoff
We study the field millisecond pulsar (MSP) population to infer its intrinsic distribution in spin period and luminosity and to determine its spatial distribution within the Galaxy…
Redshift-Space Distortions and the Real-Space Clustering of Different Galaxy Types
Luigi Guzzo, Michael A. Strauss, Karl B. Fisher +2
We study the distortions induced by peculiar velocities on the redshift-space correlation function of galaxies of different morphological types in the Pisces-Perseus redshift surve…
Radiative instabilities in simulations of spherically symmetric supernova blast waves
Paul A. Kimoto, David F. Chernoff
High-resolution simulations of the cooling regions of spherically symmetric supernova remnants demonstrate a strong radiative instability. This instability, whose presence is depen…
One-Armed Spiral Waves in Galaxy Simulations with Counter-Rotating Stars
Neil F. Comins, Richard V. E. Lovelace, Thomas Zeltwanger +1
Motivated by observations of disk galaxies with counter-rotating stars, we have run two-dimensional, collisionless N-body simulations of disk galaxies with significant counter-rota…
Seeking the Local Convergence Depth. I. TF Observations of the Clusters A168, A397, A569, A1139, A1228, and A1983
Daniel A. Dale, Riccardo Giovanelli, Martha P. Haynes +3
We present first results of an all-sky observing program designed to improve the quality of the I band Tully-Fisher (TF) template and to obtain the reflex motion of the Local Group…
The Importance of Realistic Starting Models for Hydrodynamic Simulations of Stellar Collisions
Alison Sills, James C. Lombardi
We demonstrate the necessity of using realistic stellar models taken from stellar evolution codes, as opposed to polytropes, for starting models in smoothed particle hydrodynamics…