Search Publications
Stability of hydrated minerals on Mars
Mustard, John F.; Bibring, Jean-Pierre; Poulet, François +7 more
The validity of recent identification of various hydrated minerals (kieserite, gypsum, hexahydrite, nontronite, chamosite, and montmorillonite) on Mars was assessed by exposing these minerals to simulated Martian surface conditions of atmospheric composition and pressure, temperature, and ultraviolet light irradiation. When exposed to such conditi…
Hubble Space Telescope far-ultraviolet imaging of the jet in 3C273: a common emission component from optical to X-rays
Perlman, Eric S.; Sparks, William B.; Meisenheimer, Klaus +2 more
We present far-ultraviolet (far-UV) observations at ~150 nm of the jet of quasar 3C273 obtained with the Advanced Camera for Surveys (ACS) Solar Blind Channel onboard the Hubble Space Telescope. While the jet morphology is very similar to that in the optical and near-UV, the spectral energy distributions of the jet's subregions show an upturn in ν…
Nonlinear Interaction of Minor Heavy Ions with Kinetic Alfvén Waves and Their Anisotropic Energization in Coronal Holes
Wu, D. J.; Yang, L.
Some recent observations of the solar corona suggest that minor heavy ions undergo an anisotropic and mass-charge dependent energization in the extended corona. In this paper we investigate the nonlinear interaction of minor heavy ions with kinetic Alfvén waves (KAWs) in the extended corona where plasma is low-β, in particular the ion energization…
Dynamical Evolution of Globular Cluster Systems Formed in Galaxy Mergers: Deep Hubble Space Telescope Advanced Camera for Surveys Imaging of Old and Intermediate-Age Globular Clusters in NGC 3610
Gilmore, Diane; Whitmore, Bradley C.; Schweizer, François +1 more
The Advanced Camera for Surveys on board the Hubble Space Telescope has been used to obtain deep, high-resolution images of the giant elliptical galaxy NGC 3610, a well-established remnant of a dissipative galaxy merger. These observations supersede previous, shallower observations that revealed the presence of a population of metal-rich globular …
X-Ray Spectral Study of the Extended Emission, `the Cap', Located 11.6kpc above the Disk of M82
Koyama, Katsuji; Mitsuda, Kazuhisa; Fujimoto, Ryuichi +11 more
The extended X-ray emission from `the Cap' region, located 11' (11.6kpc) above the disk of the starburst galaxy M82, has been observed with Suzaku and XMM-Newton. Owing to the good energy resolution and the large collecting area of the XIS on Suzaku, combined with similar properties of the EPIC instrument on XMM-Newton, we have clearly detected K-…
XMM-Newton observations of the eastern jet of SS 433
Burwitz, V.; Pratt, G. W.; Kawai, N. +2 more
Context: The radio supernova remnant W50 hosts at its center the peculiar galactic X-ray binary SS 433. It shows a central spherical structure with two "ears" which are supposed to be formed by the interaction of the precessing jets of SS 433 with the supernova shell.
Aims: A study of the spectral and spatial structure of the X-ray emission ca…
Very deep X-ray observations of the anomalous X-ray pulsar 4U0142+614
Campana, S.; Stella, L.; Parmar, A. N. +8 more
We report on two new XMM-Newton observations of the anomalous X-ray pulsar (AXP) 4U0142+614 performed in 2004 March and July, collecting the most accurate spectrum for this source. Furthermore, we analyse two short archival observations performed in 2002 February and 2003 January in order to study the long-term behaviour of this AXP. 4U0142+614 ap…
Cluster observations of a field aligned current at the dawn flank of a bursty bulk flow
Pitout, F.; Klecker, B.; Hasegawa, H. +9 more
This article describes observations of a bursty bulk flow (BBF) in the outer central plasma sheet. The observations are made with the Cluster satellites, located approximately 19 RE downtail, close to the midnight sector in the Southern Hemisphere. 40-60 s after Cluster first detected the BBF, there was a large bipolar perturbation in t…
How Hot is the Wind from TW Hydrae?
Herczeg, Gregory J.; Johns-Krull, Christopher M.
It has recently been suggested that the winds from classical T Tauri stars in general, and the wind from TW Hya in particular, reaches temperatures of 300,000 K while maintaining a mass-loss rate of ~10-11 Msolar yr-1 or larger. If confirmed, this would place strong new requirements on wind launching and heating mo…
Titan airglow spectra from Cassini Ultraviolet Imaging Spectrograph (UVIS): EUV analysis
Stewart, Ian; Gustin, Jacques; Ajello, Joseph M. +7 more
We present the first UV airglow observations of Titan's atmosphere by the Ultraviolet Imaging Spectrograph (UVIS) on Cassini. Using one spectral channel in the EUV from 561-1182 Å and one in the FUV from 1115-1913 Å, UVIS observed the disk on 13 December, 2004 at low solar activity. The EUV spectrum consists of three band systems of N2 …