Search Publications
A rough-surface scattering function for Titan radar studies
Campbell, Bruce A.
Numerous studies show a relationship between radar backscattering and surface roughness. While estimating the statistical properties of small-scale topography is of particular interest for geologic analysis of Cassini radar data, there is no analytic description of radar scattering over a wide range of incidence angles and roughness. This paper pr…
Comparison of the dust distributions in the innermost comae of comets—1P/Halley and 19P/Borrelly spacecraft observations
Thomas, Nicolas; Tenishev, Valeriy; Combi, Michael +3 more
We present a comparative study of the inner comae of comets 1P/Halley and 19P/Borrelly using data from the Halley Multicolour Camera (HMC) onboard Giotto and the Miniature Integrated Camera and Spectrometer onboard Deep Space 1 (DS1). We show that the dust brightness dependence as a function of radial distance is different for both comets. We sugg…
A Contribution to the Understanding of Chromospheric Oscillations
Vial, J. -C.; Baudin, F.; Bocchialini, K. +5 more
We present SUMER/SOHO UV measurements of chromospheric oscillations of intensity, velocity, and linewidth observed in C I, S I, O I, and C II lines, which are formed in the altitude range from 1000 km to 2000 km above τ500=1. Oscillations in lines originating at similar altitudes exhibit different behaviors which we discuss in terms of …
Morphologies of AGN host galaxies using HST/ACS in the CDFS-GOODS field
Hasan, Priya
Using HST/ACS images in four bands F435W, F606W, F775W and F850LP, we identify optical counterparts to the X-ray sources in the Chandra Deep Field South in the GOODS South field. A detailed study has been made of these sources to study their morphological types. We use methods like decomposition of galaxy luminosity profiles, color maps and visual…
Cluster Observations of the Magnetospheric Low-Latitude Boundary Layer and Cusp during Extreme Solar Wind and Interplanetary Magnetic Field Conditions: I. 10 November 2004 ICME
Dandouras, I.; Fazakerley, A. N.; Marghitu, O. +6 more
We present a study of the magnetospheric cusp response to extreme external parameters during passage of the ICME over the Earth on 10 November 2004, based on Cluster observations of the plasma properties inside the low-latitude boundary layer (LLBL)/cusp regions. Two separate events are observed while Cluster is in the dawn sector, 07 - 08 h magne…
The Black Hole Mass of Abell 1836-BCG and Abell 3565-BCG
Ferrarese, L.; Dalla Bontà, E.; Corsini, E. M. +3 more
Two brightest cluster galaxies (BCGs), namely Abell 1836-BCG and Abell 3565-BCG, were observed with the Advanced Camera for Surveys (ACS) and the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope. By modeling the available photometric and kinematic data, it resulted that the mass of Abell 1836-BCG and Abell 3565-BCG a…
Confirmation of New Planetary Nebulae in the Large Magellanic Cloud
Parker, Quentin A.; Reid, Warren A.; Shaw, Richard A.
We present Hubble Space Telescope (HST) images of new planetary nebulae (PNe) that were discovered in the Reid-Parker Anglo-Australian Observatory/UK Schmidt Telescope Hα survey of the Large Magellanic Cloud. These serendipitous observations from various HST programs yield independent confirmations of six PNe; one other detected nebula may also be…
The In-Flight Performance of the SOHO/CDS Grazing Incidence Spectrometer
Del Zanna, G.; Kuin, N. P. M.
We present the characteristics, operations history, performance, and calibration of the Grazing Incidence Spectrometer (GIS) of the Coronal Diagnostic Spectrometer onboard SOHO. The GIS sensitivity has been monitored in a direct manner by examining the quiet Sun count rates during 1996 - 2006, nearly a whole solar cycle of observations. Overall, t…
Application of a MHD hybrid solar wind model with latitudinal dependences to ULYSSES data at minimum
Aibéo, A.; Lima, J. J. G.; Sauty, C.
Aims:In a previous work, Ulysses data was analyzed to build a complete axisymmetric MHD solution for the solar wind at minimum including rotation and the initial flaring of the solar wind in the low corona. This model has some problems in reproducing the values of magnetic field at 1 AU despite the correct values of the velocity. Here, we intend t…
HD 143418: an unusual light variable and a double-lined spectroscopic binary with a CP primary
Wolf, M.; Prša, A.; Harmanec, P. +7 more
Aims:After a serendipitious discovery that HD 143418 is a light variable, we analyzed numerous UB{}V observations and Hipparcos Hp magnitudes transformed to Johnson V to find out whether the object is a very unusual spectroscopic binary.
Methods: Initial reductions of new photometry were carried out with the HEC22 program, while the…