Search Publications
Merging of coronal and heliospheric numerical two-dimensional MHD models
Luhmann, J. G.; Odstrcil, D.; Riley, P. +4 more
Space weather research requires investigation of a complex chain of coupled dynamic phenomena occurring simultaneously on various spatial and temporal scales between the Sun and Earth. Specialized physically based numerical models have been developed to address particular aspects of the entire system. However, an integrated modeling approach is ne…
The runaway black hole GRO J1655-40
Mirabel, I. F.; Combi, J. A.; Mignani, R. +3 more
We have used the Hubble Space Telescope to measure the motion in the sky and compute the galactocentric orbit of the black hole X-ray binary GRO J1655-40. The system moves with a runaway space velocity of 112+/- 18 km s-1 in a highly eccentric (e = 0.34+/- 0.05) orbit. The black hole was formed in the disk at a distance greater than 3 k…
Further Insights into the Structure of 30 Doradus from the Hubble Space Telescope Instruments
Walborn, Nolan R.; Barbá, Rodolfo H.; Maíz-Apellániz, Jesús
New observations with the Hubble Space Telescope Wide Field Planetary Camera 2 (WFPC2), combined with prior archival data, provide nearly complete coverage of the inner 30 Doradus Nebula in both nebular lines and continuum at 0.1" resolution. The developing windblown cavity surrounding the massive first-generation, central cluster and its interfac…
Pulse Phase Variations of the X-Ray Spectral Features in the Radio-quiet Neutron Star 1E 1207-5209
Caraveo, P. A.; Bignami, G. F.; Mereghetti, S. +3 more
We present the results of an XMM-Newton observation of the radio-quiet X-ray pulsar 1E 1207-5209 located at the center of the shell-like supernova remnant G296.5+10.0. The X-ray spectrum is characterized by the presence of two phase-dependent absorption lines at energies of ~0.7 and ~1.4 keV. Moreover, these broad spectral features have significan…
Ultraluminous Infrared Galaxies: Atlas of Near-Infrared Images
Clements, D. L.; Colina, L.; Rowan-Robinson, M. +6 more
A sample of 27 ultraluminous infrared galaxy (ULIRG) systems has been imaged at 1.6 µm using the Hubble Space Telescope (HST) Near Infrared Camera and Multi-Object Spectrometer (NICMOS). These ULIRGs are from a larger sample also imaged with HST in the I band. Images and catalog information for the NICMOS subsample, as well as brief morpholo…
The subsurface radial gradient of solar angular velocity from MDI f-mode observations
Thompson, M. J.; Corbard, T.
We report quantitative analysis of the radial gradient of solar angular velocity at depths down to about 15 Mm below the solar surface for latitudes up to 75° using the Michelson Doppler Imager (MDI) observations of surface gravity waves (fmodes) from the Solar and Heliospheric Observatory (SOHO). A negative outward gradient of around −400 nHz/R
Procyon B: Outside the Iron Box
Provencal, J. L.; Bergeron, P.; Wesemael, F. +2 more
Procyon B is one of a select group of white dwarf stars in visual binaries that are used to put stringent constraints on the fundamental physics of stellar degeneracy. We present Space Telescope Imaging Spectrograph observations of this elusive white dwarf. Our spectra cover 1800-10000 Å and contain carbon Swan bands, Mg II, and numerous iron feat…
GRB 010222: A Burst within a Starburst
Menten, K. M.; Price, P. A.; Harrison, F. A. +17 more
We present millimeter- and submillimeter-wavelength observations and near-infrared K-band imaging toward the bright gamma-ray burst GRB 010222. Over seven different epochs, a constant source was detected with an average flux density of 3.74+/-0.53 mJy at 350 GHz and 1.05+/-0.22 mJy at 250 GHz, giving a spectral index α=3.78+/-0.25 (where F~να…
The Acceleration and Release of Near-relativistic Electrons by Coronal Mass Ejections
Simnett, G. M.; Roelof, E. C.; Haggerty, D. K.
We have examined transient coronal activity observed by the Solar and Heliospheric Observatory (SOHO)/Large Angle and Spectrometric Coronagraph Experiment (LASCO) around the release time of beams of near-relativistic electrons (~40-300 keV) observed by the Advanced Composition Explorer (ACE)/Electron, Proton, and Alpha Monitor (EPAM) at 1 AU. The …
A Galactic Wind at z=5.190
Dey, Arjun; Spinrad, Hyron; Stern, Daniel +4 more
We report the serendipitous detection in high-resolution optical spectroscopy of a strong, asymmetric Lyα emission line at z=5.190. The detection was made in a 2.25 hr exposure with the Echelle Spectrograph and Imager on the Keck II telescope through a spectroscopic slit of dimensions 1''×20''. The progenitor of the emission …