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Highly Ionized High-Velocity Clouds toward PKS 2155-304 and Markarian 509
Shull, J. Michael; Giroux, Mark L.; Collins, Joseph A.
To gain insight into four highly ionized high-velocity clouds (HVCs) discovered by Sembach et al., we have analyzed data from the Hubble Space Telescope (HST) and Far Ultraviolet Spectroscopic Explorer (FUSE) for the PKS 2155-304 and Mrk 509 sight lines. We measure strong absorption in O VI and column densities of multiple ionization stages of sil…
The late-time light curve of the type Ia supernova 2000cx
Sollerman, J.; Lundqvist, P.; Spyromilio, J. +10 more
We have conducted a systematic and comprehensive monitoring programme of the type Ia supernova 2000cx at late phases using the VLT and HST. The VLT observations cover phases 360 to 480 days past maximum brightness and include photometry in the BVRIJH bands, together with a single epoch in each of U and K_s. While the optical bands decay by about 1…
Structure and kinematics of candidatedouble-barred galaxies
Moiseev, A. V.; Chavushyan, V. H.; Valdés, J. R.
Results of optical and NIR spectral and photometric observations of a sample of candidate double-barred galaxies are presented. Velocity fields and velocity dispersion maps of stars and ionized gas, continuum and emission-line images were constructed from integral-field spectroscopy observations carried out at the 6 m telescope (BTA) of SAO RAS, w…
Evolution of Solar Supergranulation
Toomre, Juri; De Rosa, Marc L.
The structure and evolution of solar supergranulation is studied using horizontal velocity fields, deduced from applying local correlation tracking (LCT) techniques to full-disk, line-of-sight Doppler velocity data observed by the Michelson Doppler Imager on board the Solar and Heliospheric Observatory spacecraft. Two 45° square regions of photosp…
The sizes and kinematic structure of absorption systems towards the lensed quasar APM08279+5255
Petitjean, P.; Pettini, M.; Lewis, G. F. +4 more
We have obtained spatially resolved spectra of the z_em=3.911 triply imaged QSO APM08279+5255 using the Space Telescope Imaging Spectrograph (STIS) on board the Hubble Space Telescope (HST). We study the line of sight equivalent width (EW) differences and velocity shear of high and low ionization absorbers (including a damped Lyman alpha [DLA] sys…
A Synoptic X-Ray Study of M31 with the Chandra High Resolution Camera
Williams, Benjamin F.; Kong, Albert K. H.; King, A. R. +4 more
We have obtained 17 epochs of Chandra High Resolution Camera (HRC) snapshot images, each covering most of the M31 disk. The data cover a total baseline of ~2.5 yr and contain a mean effective exposure of 17 ks. We have measured the mean fluxes and long-term light curves for 166 objects detected in these data. At least 25% of the sources show signi…
External and Internal Reconnection in Two Filament-Carrying Magnetic Cavity Solar Eruptions
Moore, Ronald L.; Sterling, Alphonse C.
We observe two near-limb solar filament eruptions, one of 2000 February 26 and the other of 2002 January 4. For both we use 195 Å Fe XII images from the Extreme-Ultraviolet Imaging Telescope (EIT) and magnetograms from the Michelson Doppler Imager (MDI), both of which are on the Solar and Heliospheric Observatory (SOHO). For the earlier event we a…
Multipoint investigation of the source region of storm-time chorus
Santolík, O.; Gurnett, D.; Pickett, J.
Available from http://www.copernicus.org/site/EGU/annales/22/7/2555.htm?FrameEngine=false;
Near-Infrared Observations at 1.56 Microns of the 2003 October 29 X10 White-Light Flare
Xu, Yan; Cao, Wenda; Liu, Chang +5 more
We present high-resolution observations of an X10 white-light flare in solar NOAA Active Region 10486 obtained with the Dunn Solar Telescope (DST) at the National Solar Observatory/Sacramento Peak on 2003 October 29. Our investigation focuses on flare dynamics observed in the near-infrared (NIR) continuum at 1.56 µm. This is the first report…
The isolated neutron star X-ray pulsars RX J0420.0-5022 and RX J0806.4-4123 : New X-ray and optical observations
Haberl, F.; Motch, C.; Gänsicke, B. T. +6 more
We report on the analysis of new X-ray data obtained with XMM-Newton and Chandra from two ROSAT-discovered X-ray dim isolated neutron stars (XDINs).