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A New Technique for Deriving Prominence Mass from SOHO/EIT Fe XII (19.5 Nanometers) Absorption Features
Gilbert, Holly R.; Holzer, Thomas E.; MacQueen, R. M.
It is presently unclear what role prominences play in the initiation and dynamics of coronal mass ejections (CMEs), although erupting prominences are strongly correlated with CMEs. The masses of prominences involved in CMEs are not generally measured, but the accurate determination of such masses may help in assessing the dynamical importance of p…
Are radio galaxies and quiescent galaxies different? Results from the analysis of HST brightness profiles
Capetti, A.; Morganti, R.; de Ruiter, H. R. +3 more
We present a study of the optical brightness profiles of early type galaxies, using a number of samples of radio galaxies and optically selected elliptical galaxies. For the radio galaxy samples - B2 of Fanaroff-Riley type I and 3C of Fanaroff-Riley type II - we determined a number of parameters that describe a "Nuker-law" profile, which were comp…
Evolution in the Cluster Early-Type Galaxy Size-Surface Brightness Relation at z~=1
Demarco, R.; Infante, L.; Zheng, W. +41 more
We investigate the evolution in the distribution of surface brightness, as a function of size, for elliptical and S0 galaxies in the two clusters RDCS J1252.9-2927 (z=1.237) and RX J0152.7-1357 (z=0.837). We use multicolor imaging with the Advanced Camera for Surveys on the Hubble Space Telescope to determine these sizes and surface brightnesses. …
Calibration of the Planetary Fourier Spectrometer short wavelength channel
Piccioni, G.; Grassi, D.; Moshkin, B. E. +18 more
The Planetary Fourier Spectrometer (PFS) experiment on board the Mars Express mission has two channels covering the 1.2-5.5 µm short wavelength channel (SWC) and the 5.5-45 µm (LWC). The SWC measures part of the thermal emission spectrum and the solar reflected spectrum of Mars between 1700 and 8200 cm -1 with a spectral res…
Coronal properties of G-type stars in different evolutionary phases
Pallavicini, R.; Peres, G.; Maggio, A. +1 more
We report on the analysis of XMM-Newton observations of three G-type stars in very different evolutionary phases: the weak-lined T Tauri star
X-Ray Spectroscopy of Candidate Ultracompact X-Ray Binaries
Chakrabarty, Deepto; Juett, Adrienne M.
We present high-resolution spectroscopy of the neutron star/low-mass X-ray binaries (LMXBs) 4U 1850-087 and 4U 0513-40 as part of our continuing study of known and candidate ultracompact binaries. The LMXB 4U 1850-087 is one of four systems in which we had previously inferred an unusual Ne/O ratio in the absorption along the line of sight, most li…
A Deep Radio Survey of Abell 2125. II. Accelerated Galaxy Evolution during a Cluster-Cluster Merger
Morrison, G. E.; Wang, Q. D.; Owen, Frazer N. +2 more
Using our extensive radio, optical, near-IR, and X-ray imaging and spectroscopy, we consider the reason for the unusually large number of radio-detected galaxies, mostly found outside the cluster core, in Abell 2125 (z=0.2465, richness class 4). With 20 cm VLA data, we detect continuum emission from 90 cluster members. The multiwavelength properti…
Wave particle interactions in the high-altitude polar cusp: a Cluster case study
Balogh, A.; Lavraud, B.; André, M. +5 more
On 23 March 2002, the four Cluster spacecraft crossed in close configuration (~100 km separation) the high-altitude (10 RE) cusp region. During a large part of the crossing, the STAFF and EFW instruments have detected strong electromagnetic wave activity at low frequencies, especially when intense field-aligned proton fluxes were detect…
The element abundance FIP effect in the quiet Sun
Young, P. R.
The Mg/Ne abundance ratio in the quiet Sun is measured in both network and supergranule cell centre regions through EUV spectra from the Coronal Diagnostic Spectrometer on SOHO. Twenty four sets of data over the period 1996 March to 1998 June (corresponding to solar minimum and the onset of the next cycle) are studied. Emission lines of the sequen…
Titan atmosphere database
Lebonnois, S.; Rannou, P.; Luz, D. +1 more
We have developed in the last decade a two-dimensional version of the Titan global circulation model LMDZ. This model accounts for multiple coupling occuring on Titan between dynamics, haze, chemistry and radiative transfer. It was successful at explaining many observed features related to atmosphere state (wind, temperature), haze structure and c…