Science Archives Publication System

A Dynamical Simulation of the Debris Disk around HD 141569A

DOI: 10.1086/430395 Bibcode: 2005ApJ...627..986A

Ford, H. C.; Infante, L.; Zheng, W. +36 more

We study the dynamical origin of the structures observed in the scattered-light images of the resolved debris disk around HD 141569A. The disk has two conspicuous spiral rings and two large-scale spiral arms. We explore the roles of radiation pressure from the central star, gas drag from the gas disk, and the tidal forces from two nearby stars in …

2005 • The Astrophysical Journal

eHST 39

Intrinsic Absorption in the Spectrum of NGC 7469: Simultaneous Chandra, FUSE, and STIS Observations

DOI: 10.1086/496911 Bibcode: 2005ApJ...634..193S

Kaiser, Mary Elizabeth; Green, Richard F.; Scott, Jennifer E. +10 more

We present simultaneous X-ray, far-ultraviolet, and near-ultraviolet spectra of the Seyfert 1 galaxy NGC 7469 obtained with the Chandra X-Ray Observatory, the Far Ultraviolet Spectroscopic Explorer, and the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. Previous nonsimultaneous observations of this galaxy found two distinct UV…

2005 • The Astrophysical Journal

XMM-Newton eHST 39

Radar imaging of Saturn's rings

DOI: 10.1016/j.icarus.2005.03.023 Bibcode: 2005Icar..177...32N

Nicholson, Philip D.; French, Richard G.; Campbell, Donald B. +4 more

We present delay-Doppler images of Saturn's rings based on radar observations made at Arecibo Observatory between 1999 and 2003, at a wavelength of 12.6 cm and at ring opening angles of 20.1°⩽|B|⩽26.7°. The average radar cross-section of the A ring is ∼77% relative to that of the B ring, while a stringent upper limit of 3% is placed on the cross-s…

2005 • Icarus

Cassini eHST 39

Mid-infrared imaging of NGC 1068 with VISIR at the Very Large Telescope

DOI: 10.1111/j.1745-3933.2005.00064.x Bibcode: 2005MNRAS.363L...1G

Pantin, E.; Alloin, D.; Galliano, E. +1 more

High-resolution mid-infrared (MIR) images of the central region of NGC 1068 have been obtained with VISIR, the multi-mode MIR instrument recently installed at the European Southern Observatory Very Large Telescope on Paranal. A map of the emission at 12.8 µm with increased sensitivity over the central 8 × 8 arcsec² area is discuss…

2005 • Monthly Notices of the Royal Astronomical Society

eHST 39

An ISOCAM survey through gravitationally lensing galaxy clusters. IV. Luminous infrared galaxies in Cl 0024+1654 and the dynamical status of clusters

DOI: 10.1051/0004-6361:20041782 Bibcode: 2005A&A...431..433C

Kneib, J. -P.; Altieri, B.; Miville-Deschênes, M. -A. +9 more

Observations of the core of the massive cluster Cl 0024+1654, at a redshift z ∼ 0.39, were obtained with the Infrared Space Observatory using ISOCAM at 6.7 µm (hereafter 7 µm) and 14.3 µm (hereafter 15 µm). Thirty five sources were detected at 15 µm and thirteen of them are spectroscopically identif…

2005 • Astronomy and Astrophysics

ISO eHST 39

On the effect of the background wind on the evolution of interplanetary shock waves

DOI: 10.1051/0004-6361:20041676 Bibcode: 2005A&A...430.1099J

Poedts, S.; Chané, E.; Jacobs, C. +1 more

The propagating shock waves in the solar corona and interplanetary (IP) space caused by fast Coronal Mass Ejections (CMEs) are simulated numerically and their structure and evolution is studied in the framework of ideal magnetohydrodynamics (MHD). Due to the presence of three characteristic velocities and the anisotropy induced by the magnetic fie…

2005 • Astronomy and Astrophysics

SOHO 39

A Comparison of Surface Brightness Profiles for Ultracompact Dwarfs and Dwarf Elliptical Nuclei: Implications for the ``Threshing'' Scenario

DOI: 10.1086/430207 Bibcode: 2005ApJ...623L.105D

Drinkwater, M. J.; De Propris, R.; Jones, J. B. +4 more

Using imaging from the Hubble Space Telescope, we derive surface brightness profiles for ultracompact dwarfs in the Fornax Cluster and for the nuclei of dwarf elliptical galaxies in the Virgo Cluster. Ultracompact dwarfs are more extended and have higher surface brightnesses than typical dwarf nuclei, while the luminosities, colors, and sizes of t…

2005 • The Astrophysical Journal

eHST 39

Multi-spacecraft determination of wave characteristics near the proton gyrofrequency in high-altitude cusp

DOI: 10.5194/angeo-23-983-2005 Bibcode: 2005AnGeo..23..983S

Wahlund, J. -E.; André, M.; Stenberg, G. +11 more

We present a detailed study of waves with frequencies near the proton gyrofrequency in the high-altitude cusp for northward IMF as observed by the Cluster spacecraft. Waves in this regime can be important for energization of ions and electrons and for energy transfer between different plasma populations. These waves are present in the entire cusp …

2005 • Annales Geophysicae

Cluster 39

Fiber bursts as 3D coronal magnetic field probe in postflare loops

DOI: 10.1051/0004-6361:20042199 Bibcode: 2005A&A...435.1137A

Mann, G.; Aurass, H.; Rausche, G. +1 more

Fiber bursts appear in some complex solar radio bursts as a continuum fine structure in the frequency range of 150\cdots3000 MHz. We present and test a new method to use fiber bursts as a probe of the magnetic field strength and the 3D field structure in postflare loops. Thereby we assume that fiber bursts are driven by whistler waves ascending in…

2005 • Astronomy and Astrophysics

SOHO 39

Planetary Fourier spectrometer data analysis: Fast radiative transfer models

DOI: 10.1016/j.pss.2004.12.009 Bibcode: 2005P&SS...53.1035I

Grassi, D.; Ignatiev, N. I.; Zasova, L. V.

We present fast algorithms used in IKI and IFSI for the analysis of the Martian spectra measured in the Planetary Fourier Spectrometer (PFS) experiment onboard Mars Express orbiter. The first algorithm is based on a new very general and precise approach applicable to planetary atmospheres with quite arbitrary absorption and scattering properties. …

2005 • Planetary and Space Science

MEx 39