Search Publications
Catalog of Galaxy Morphology in Four Rich Clusters: Luminosity Evolution of Disk Galaxies at 0.33 < z < 0.83
Saintonge, Amélie; Yee, H. K. C.; Carlberg, R. G. +2 more
Hubble Space Telescope (HST) imaging of four rich, X-ray-luminous, galaxy clusters (0.33<z<0.83) is used to produce quantitative morphological measurements for galaxies in their fields. Catalogs of these measurements are presented for 1642 galaxies brighter than F814W(AB)=23.0. Galaxy luminosity profiles are fitted with three models: exponen…
Observations of the companion to the pulsar PSR B1718-19. The role of tidal circularisation
van Kerkwijk, M. H.; Janssen, T.
We present optical and infrared observations taken with the Very Large Telescope of the eclipsing binary pulsar system
The Earth's Magnetopause: Reconstruction of Motion and Structure
de Keyser, Johan
The Earth’s magnetosphere is an accessible region for improving our knowledge of the dynamics of collisionless plasmas. We focus here on the magnetopause a typical plasma discontinuity. We discuss recent developments in describing the structure of the magnetopause by means of reconstruction techniques, which translate in situ data into spatial inf…
The Magnetospheric cusps: A Summary
Zong, Q. G.; Fritz, T. A.
The polar cusps of the magnetosphere are key regions for the transfer of mass, momentum, and energy from the solar wind into the magnetosphere. Understaning these key regions and the dynamical interactions that occur there are fundamentally important to determining the physical nature of the magnetosphere. In this paper we try to summarize many of…
A Far-Ultraviolet Study of the Old Nova V841 Ophiuchi
Sion, Edward M.; Engle, Scott G.
We have carried out a synthetic spectral analysis of archival International Ultraviolet Explorer spectra of the old nova V841 Oph (Nova Oph 1848) taken 15 years apart. The spectra reveal a rising continuum shortward of 1560 Å, a C IV P Cygni profile indicative of wind outflow associated with disk accretion in one spectrum, a deep Lyα profile, and …
X-Ray Spectra of the Narrow-Line Seyfert 1 Galaxy Ton S180 in Comparison with Galactic Black Holes
Hong, Soojing; Kokubun, Motohide; Makishima, Kazuo +3 more
An analysis was made of 0.3-15keV X-ray spectra of a Narrow-Line Seyfert 1 Galaxy, Ton S180, using archival data from ASCA, RXTE, and XMM-Newton. At energies above 2.5keV, a power-law with a photon index of ∼ 2.3 successfully and consistently reproduced the spectra from all of these observatories. Assuming this power-law component to extend toward…
Optical and EUV observations of solar flare kernels
Doyle, J. G.; Madjarska, M. S.; Butler, C. J. +3 more
We present high-resolution spectral observations, covering the entire optical region (3800-9000 Å), of a solar flare observed during a multi-wavelength campaign. The flare, recorded on 2002 January 11, was a medium solar flare event (GOES class C7.5). The spectral observations were carried out using the Hamilton echelle spectrograph on the coudé a…
Electromagnetic Bounded States and Challenges of Plasma Spectroscopy
Fainberg, J.; Benson, R. F.; Osherovich, V. A.
Hubble Space Telescope Observations of Star-forming Regions in NGC 3994/3995
Weistrop, D.; Eggers, D.; Stone, A. +2 more
We obtained ultraviolet and optical images of star-forming regions in the interacting galaxy system NGC 3994/3995 using the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. We describe the characteristics of 56 detected knots, a majority of which are younger than 20 Myr old. There is no discernible pattern of knot age with respe…
Subsurface radar sounding of the martian polar cap: radiative transfer approach
Ilyushin, Ya. A.; Seu, R.; Phillips, R. J.
The problem of subsurface radar sounding of the martian polar caps [Ilyushin, 2004. Martian northern polar cap: layering and possible implications for radar sounding. Planet. Space Sci. 52, 1195-1207] is considered from the point of view of incoherent radiative transfer theory. Since it has been previously shown that the radar signal field within …