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58 papers · 2 filters
The Submillimeter Frontier: A Space Science Imperative
John C. Mather, S. Harvey Moseley, David Leisawitz +8
A major goal of modern astrophysics is to understand the processes by which the universe evolved from its initial simplicity, as seen in measurements of the Cosmic Microwave Backgr…
On the Particle Heating and Acceleration in Black Hole Accretion Systems
H. Li, S. A. Colgate, M. Kusunose +1
The lack of our knowledge on how angular momentum is transported in accretion disks around black holes has prevented us from fully understanding their high energy emissions. We bri…
Magneto-centrifugally driven winds: comparison of MHD simulations with theory
G. V. Ustyugova, A. V. Koldoba, M. M. Romanova +2
Stationary magnetohydrodynamic (MHD) outflows from a rotating, conducting Keplerian accretion disk threaded by B-field are investigated numerically by time-dependent, axisymmetric…
1620 Geographos and 433 Eros: Shaped by Planetary Tides?
W. F. Bottke, D. C. Richardson, P. Michel +1
Until recently, most asteroids were thought to be solid bodies whose shapes were determined largely by collisions with other asteroids. It now seems that many asteroids are little…
Resonant Tidal Excitations of Rotating Neutron Stars in Coalescing Binaries
Wynn C. G. Ho, Dong Lai
In a coalescing neutron star-neutron star (NS-NS) or neutron star-black hole (NS-BH) binary, oscillation modes of the NS can be resonantly excited by the companion during the final…
Three contributions to Galaxy Dynamics: distant galaxy kinematics, mass, and M/L
M. A. Bershady, A. Jangren, D. R. Andersen +3
1) Rotation Curves and M/L Evolution for Galaxies to z=0.4, (Bershady, Haynes, Giovanelli, & Andersen) 2) Mass Estimates of Starbursting Galaxies: Line Widths versus Near-IR Lumino…
Magnetic propeller outflows
R. V. E. Lovelace, M. M. Romanova, G. S. Bisnovatyi-Kogan
A model is developed for magnetic `propeller'-driven outflows which cause a rapidly rotating magnetized star accreting from a disk to spin-down. Energy and angular momentum lost by…
Neutrino-Nucleon Interactions in Magnetized Neutron-Star Matter: The Effects of Parity Violation
Phil Arras, Dong Lai
We study neutrino-nucleon scattering and absorption in a dense, magnetized nuclear medium. These are the most important sources of neutrino opacity governing the cooling of a proto…
Canaries in a Coal Mine: Using Globular Clusters to Place Limits on Massive Black Holes in the Galactic Halo
Phil Arras, Ira Wasserman
We explore the possibility that massive black holes comprise a significant fraction of the dark matter of our galaxy by studying the dissolution of galactic globular clusters bomba…
Pulsar Spin-up, Kinematics, and the Birthrate of Neutron Star Binaries
Z. Arzoumanian, J. M. Cordes, I. Wasserman
From considerations of spin evolution and kinematics in the galactic potential, we argue that the pulsars B1913+16, B1534+12, and B2127+11C may be younger than previously assumed,…
G359.87+0.18: An FR II Radio Galaxy 15 Arcminutes from Sgr A*. Implications for the Scattering Region in the Galactic Center
T. Joseph W. Lazio, K. R. Anantharamaiah, W. M. Goss +2
G359.87+0.18 is an enigmatic object located 15' from Sgr A*. It has been variously classified as an extragalactic source, Galactic jet source, and young supernova remnant. We prese…
Contribution of Bright Extragalactic Radio Sources to Microwave Anisotropy
Aaron Sokasian, Eric Gawiser, George F. Smoot
We estimate the contribution of extragalactic radio sources to fluctuations in sky temperature over the range of frequencies (10-300 GHz) used for Cosmic Microwave Background (CMB)…
Spherical Bondi accretion onto a magnetic dipole
Yu. M. Toropin, O. D. Toropina, M. M. Romanova +3
Quasi-spherical supersonic (Bondi-type) accretion to a star with a dipole magnetic field is investigated using resistive magnetohydrodynamic simulations. A systematic study is made…
Gamma Radiation from PSR B1055-52
D. J. Thompson
The telescopes on the Compton Gamma Ray Observatory (CGRO) have observed PSR B1055-52 a number of times between 1991 and 1998. From these data, a more detailed picture of the gamma…
The Cosmic Infrared Background Radiation, Star Formation Rate, and Metallicity
Martin Harwit
The density of the far infrared / submillimeter (FIR/SMM) diffuse extragalactic radiation field has recently been determined from COBE data. Nearly simultaneously, deep FIR/SMM sur…
Possible explanation for star-crushing effect in binary neutron star simulations
Eanna E. Flanagan
A possible explanation is suggested for the controversial star-crushing effect seen in numerical simulations of inspiraling neutron star binaries by Wilson, Mathews and Marronetti…
Dark Matter and Gas Concentrations in the NGC 4532 / DDO 137 System
G. L. Hoffman, N. Y. Lu, E. E. Salpeter +1
Neutral hydrogen synthesis mapping of NGC 4532 and DDO 137, a pair of Sm galaxies on the edge of the Virgo cluster, is used to determine rotation curves for each of the galaxies an…
Seeking the Local Convergence Depth. The Abell Cluster Dipole Flow to 200 Mpc/h
Daniel A. Dale, Riccardo Giovanelli, Martha P. Haynes +3
We have obtained new Tully-Fisher (TF) peculiar velocity measurements for 52 Abell galaxy clusters distributed throughout the sky between ~ 50 and 200 Mpc/h.The measurements are ba…
Hydrodynamic Simulations of Counterrotating Accretion Disks
O. A. Kuznetsov, R. V. E. Lovelace, M. M. Romanova +1
Hydrodynamic simulations have been used to study accretion disks consisting of counterrotating components with an intervening shear layer(s). Configurations of this type can arise…
Roles of Hyperons in Neutron Stars
Shmuel Balberg, Itamar Lichtenstadt, Gregory. B. Cook
We examine the roles the presence of hyperons in the cores of neutron stars may play in determining global properties of these stars. The study is based on estimates that hyperons…
ISO LWS Spectroscopy of M82: A Unified Evolutionary Model
J. W. Colbert, M. A. Malkan, P. E. Clegg +9
We present the first complete far-infrared spectrum (43 to 197 um) of M82, the brightest infrared galaxy in the sky, taken with the Long Wavelength Spectrometer of the Infrared Spa…
The Universality of the Fundamental Plane of E and S0 Galaxies. Spectroscopic data
M. Scodeggio, R. Giovanelli, M. P. Haynes
We present here central velocity dispersion measurements for 325 early-type galaxies in eight clusters and groups of galaxies, including new observations for 212 galaxies. The clus…
The Universality of the Fundamental Plane of E and S0 Galaxies. Sample Definition and I Band Photometric Data
M. Scodeggio, R. Giovanelli, M. P. Haynes
As part of a project to compare the Fundamental Plane and Tully-Fisher distance-scales, we present here I band CCD photometry for 636 early-type galaxies in 8 clusters and groups o…
Rossby Wave Instability of Keplerian Accretion Disks
R. V. E. Lovelace, H. Li, S. A. Colgate +1
We find a linear instability of non-axisymmetric Rossby waves in a thin non-magnetized Keplerian disk when there is a local maximum in the radial profile of a key function ${\cal L…