Search Publications
Missions
Journals
Publication Years
EUV Spectroscopic Observations of Spray Ejecta from an X2 Flare
Mason, H. E.; Pike, C. D.
An X2.3 class flare was reported on 10 April 2001 in AR 9415. A halo coronal mass ejection (CME) was associated with this flare. The Coronal Diagnostic Spectrometer (CDS) on board the Solar and Heliospheric Observatory (SOHO), which was running in its daily synoptic mode, recorded a very high-velocity ejection of plasma associated with this activi…
The Spectral Energy Distribution of the Seyfert Galaxy Ton S180
Zheng, W.; Turner, T. J.; Kraemer, S. B. +14 more
We present spectral results from a multisatellite, broadband campaign on the narrow-line Seyfert 1 galaxy Ton S180 (PHL 912) performed at the end of 1999. We discuss the spectral energy distribution (SED) of the source, combining simultaneous Chandra, ASCA, and Extreme Ultraviolet Explorer data with contemporaneous Far Ultraviolet Spectroscopic Ex…
XMM-Newton observation of a distant X-ray selected cluster of galaxies at z=1.26 with possible cluster interaction
Rosati, Piero; Hashimoto, Yasuhiro; Miyaji, Takamitsu +2 more
We report on the XMM-Newton observation of RX J1053.7+5735, one of the most distant (z = 1.26) X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of possible cluster-cluster interaction. The cluster was discovered during our ROSAT deep pointings in the direction of the Lockman Hole. The XMM-N…
Autocorrelation Analysis of Hipparcos Photometry of Short-Period Be Stars
Percy, John R.; Hosick, JoAnne; Kincaide, Heather +1 more
We have used Hipparcos epoch photometry and a form of autocorrelation analysis to investigate the amplitude and timescale of the short-period variability of 82 Be stars, including 46 Be stars that were analyzed by Hubert & Floquet using Fourier and CLEAN analysis and 36 other Be stars that were suspected of short-period variability. Our method…
The Huygens Doppler Wind Experiment - Titan Winds Derived from Probe Radio Frequency Measurements
Plettemeier, D.; Bird, M. K.; Wohlmuth, R. +10 more
A Doppler Wind Experiment (DWE) will be performed during the Titan atmospheric descent of the ESA Huygens Probe. The direction and strength of Titan's zonal winds will be determined with an accuracy better than 1 m s-1 from the start of mission at an altitude of ∼160 km down to the surface. The Probe's wind-induced horizontal motion wil…
Evidence of a Flux-Rope Model for Corona Mass Ejections Based on Observations of the Limb Prominence Eruption on 2002 January 4
Yurchyshyn, Vasyl B.
We report on a prominence eruption as seen in Kanzelhöhe Solar Observatory Hα images, Solar and Heliospheric Observatory (SOHO) EUV Imaging Telescope (EIT) 195 Å images, and coronal SOHO Large Angle Spectrometric Coronograph C2 images. Our data favor the flux-rope model for coronal mass ejections (CMEs), which suggests that a flux rope is formed l…
Space Telescope Imaging Spectrograph Observations of High-Velocity Interstellar Absorption-Line Profiles in the Carina Nebula
Walborn, Nolan R.; Danks, Anthony C.; Landsman, Wayne B. +1 more
An atlas of ultraviolet interstellar absorption-line profiles toward four stars in the Carina Nebula is presented. The observations have been made with the Space Telescope Imaging Spectrograph on the Hubble Space Telescope, with a resolving power of 114,000. Low-ionization, high-ionization, and excited-state lines from a wide array of chemical spe…
Discovery of an Edge-on Dust Disk around the [WC10] Central Star CPD -56°8032
Barlow, M. J.; De Marco, Orsola; Cohen, M.
We present Hubble Space Telescope ultraviolet and optical Space Telescope Imaging Spectrograph spectroscopy of the [WCL] planetary nebula central star CPD -56°8032, obtained during its latest light-curve minimum. The UV spectrum shows the central star's continuum light distribution to be split into two bright peaks separated by 0.10". We interpret…
Hubble Space Telescope Detection of a Quiescent Low-Mass X-Ray Binary Companion in 47 Tucanae
Heinke, Craig O.; Gilliland, Ronald L.; Edmonds, Peter D. +1 more
We present the results of a search for optical counterparts to the two quiescent low-mass X-ray binaries (X5 and X7) in the globular cluster 47 Tucanae, using high-quality Chandra and Hubble Space Telescope images. A faint blue (V=21.7; U-V=0.9) star within 0.03" of the eclipsing system X5 shows variability on both short and long timescales and is…
The Lyα Forest of a Lyman Break Galaxy: Very Large Telescope Spectra of MS 1512-cB58 at z=2.724
Panagia, N.; Padovani, P.; Savaglio, S.
The high-redshift galaxy MS 1512-cB58 (z=2.724, mV=20.64) has been observed with the very efficient high-resolution UV-Visual Eschelle Spectograph on the Very Large Telescope. Although this is a very challenging observational program for a Southern Hemisphere telescope (the galaxy is located at +36° declination), high-resolution spectra…