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Initial localization and kinematic characteristics of the structural components of a coronal mass ejection
Hudson, H. S.; Grechnev, V. V.; Uralov, A. M.
The leading component of a coronal mass ejection (CME), its observed frontal structure (FS), has been detected close to the solar surface in a few near-the-limb events only. Thus far, no manifestations of such a frontal structure have been reported in reasonable proximity to a preeruptive filament located away from the solar limb. Thus the identif…
Proton and electron acceleration by quasi-perpendicular fast magnetosonic shocks in interplanetary space
Simnett, G. M.; Forsyth, R. J.; Sakai, J. -I.
Recent observations from the Ulysses spacecraft (Simnett 2003, Sol. Phys., 213, 387) have measured the energy spectrum of the ambient ions associated with the passage of a fast magnetosonic quasi-perpendicular shock driven by a coronal mass ejection (CME). Near the shock front the energy spectrum of the accelerated ions, which are predominantly pr…
The icy Galilean satellites: ultraviolet phase curve analysis
Domingue, Deborah L.; Hendrix, Amanda R.; King, Kimberly
Ultraviolet disk-integrated solar phase curves of the icy galilean satellites Europa, Ganymede, and Callisto are presented, using combined data sets from the International Ultraviolet Explorer (IUE), Hubble Space Telescope (HST), and the Galileo Ultraviolet Spectrometer. Global, disk-integrated solar phase curves for all three satellites, in addit…
The spectroscopic orbits and other parameters of the symbiotic binary FN Sgr
Pereira, C. B.; Mikołajewska, J.; Ferrer, O. E. +4 more
We present a study of the eclipsing symbiotic binary FN Sgr with a period of 568.3 days determined photometrically and confirmed spectroscopically. The hot component underwent a 2.5 mag eruption covered by most of our spectroscopic observations. In particular, we have determined for the first time spectroscopic orbits based on the radial velocity …
The [O III] Veil: Astropause of η Carinae's Wind?
Smith, Nathan; Bally, John; Morse, Jon A.
We present narrowband images of η Carinae in the light of [O III] λ5007 obtained with the Hubble Space Telescope (HST) Wide Field Planetary Camera 2, as well as a ground-based image in the same emission line with a larger field of view. These images show a thin veil of [O III] emission around η Car and its ejecta, confirming the existence of an ox…
Why Optically Faint AGNs Are Optically Faint: The Spitzer Perspective
Rigby, J. R.; Barmby, P.; Fazio, G. G. +5 more
Optically faint X-ray sources (those with fX/fR>10) constitute about 20% of X-ray sources in deep surveys and are potentially highly obscured and/or at high redshift. Their faint optical fluxes are generally beyond the reach of spectroscopy. For a sample of 20 optically faint sources in CDFS, we compile 0.4-24 µm pho…
OH megamasers, starburst and AGN activity in Markarian 231
Knapen, J. H.; Richards, A. M. S.; Gray, M. D. +5 more
We present Multi-Element Radio-Linked Interferometer Network (MERLIN) observations of OH maser and radio continuum emission within a few hundred pc of the core of the ultraluminous infrared galaxy (ULIRG) Markarian 231. This is the only known OH megamaser galaxy classed as a Seyfert 1. Maser emission is identified with the 1665- and 1667-MHz trans…
Star formation histories in local group dwarf galaxies [review article]
Skillman, Evan D.
I review observations made with the Hubble Space Telescope which have improved our view of both recent (ages ⩽1 Gyr) and ancient (ages ⩾1 Gyr) star formation histories in dwarf galaxies. The method of reconstructing recent star formation histories has been well tested, and now the major challenge is to build a large database of suitable observatio…
Phase diversity restoration of sunspot images. II. Dynamics around a decaying sunspot
Roudier, Th.; Muller, R.; Márquez, I. +2 more
Two time series, taken simultaneously in the G-band and in white-light, and corrected for telescope aberrations and turbulence perturbations using the method of phase diversity, are employed to study the motions of granules and G-band bright points (GBPs) in the moat of an old regular sunspot. Local correlation tracking and feature tracking have b…
Overtones of silicate and aluminate minerals and the 5-8 µm ice bands of deeply embedded objects
Hofmeister, A. M.; Bowey, J. E.
The distinct patterns, relatively low intensities and peak positions of overtone-combination bands of silicates and oxides suggest that the 5-8 µm spectral region can provide clues for the dust composition when near optically thick conditions exist for the 10-µm silicate feature. We present 1000-2500 cm-1 room-temperature la…