Search Publications
GRB 010921: Localization and Observations by the High Energy Transient Explorer Satellite
Sakamoto, T.; Yamauchi, M.; Cline, T. +36 more
On 2001 September 21 at 05:15:50.56 UT, the French Gamma Telescope (FREGATE) on the High Energy Transient Explorer (HETE) detected a bright gamma-ray burst (GRB). The burst was also seen by the X-detector on the Wide-field X-ray Monitor (WXM) instrument and was therefore well localized in the X-direction however, the burst was outside the fully co…
Far Ultraviolet Spectroscopic Explorer Observations of the Seyfert 1.5 Galaxy NGC 5548 in a Low State
Zheng, W.; Kriss, G. A.; Hutchings, J. B. +4 more
We present far-ultraviolet spectra of the Seyfert 1.5 galaxy NGC 5548 obtained in 2000 June with the Far Ultraviolet Spectroscopic Explorer (FUSE). Our data span the observed wavelength range 915-1185 Å at a resolution of ~20 km s-1. The spectrum shows a weak continuum and emission from O VI λλ1032, 1038, C III λ977, and He II λ1085. Th…
Core and Large-Scale Structure of the 2000 November 24 X-Class Flare and Coronal Mass Ejection
Yang, Guo; Wang, Haimin; Yurchyshyn, Vasyl +2 more
In this paper, we present three important aspects of the X1.8 flare and the associated coronal mass ejection (CME) that occurred on 2000 November 24: (1) The source of the flare is clearly associated with a magnetic channel structure, as was noted in a study by Zirin & Wang , which is due to a combination of flux emergence inside the leading e…
The Photoionization of a Star-forming Core in the Trifid Nebula
Cernicharo, J.; Cesarsky, D.; Heras, A. +3 more
We have carried out a comprehensive multiwavelength study of the bright-rimmed globule TC2 in the Trifid Nebula, using the IRAM 30 m telescope, the VLA centimeter array, and the Infrared Space Observatory (ISO). TC2 is one of the very few globules to exhibit signs of active ongoing star formation while being photoevaporated by the Lyman continuum …
Hubble Space Telescope/STIS Spectroscopy of the White Dwarfs in the Short-Period Dwarf Novae LL Andromedae and EF Pegasi
Szkody, Paula; Howell, Steve B.; Sion, Edward M. +1 more
We present new Hubble Space Telescope Space Telescope Imaging Spectrograph observations of the short-period dwarf novae LL And and EF Peg during deep quiescence. We fit stellar models to the UV spectra and use optical and IR observations to determine the physical parameters of the white dwarfs in the systems, the distances to the binaries, and the…
Australia Telescope Compact Array Radio Imaging of the Proplyd-like Objects in the Giant H II Region NGC 3603
Corcoran, M. F.; Koribalski, B. S.; Stevens, I. R. +2 more
Three cometary-shaped objects in the giant H II region NGC 3603, originally found and identified as proto-planetary disks (proplyds) by Brandner and coworkers using the Hubble Space Telescope and the Very Large Telescope in the optical and near-infrared, have been detected with the Australia Telescope Compact Array5 in the radio continuum at 3 and…
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…
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…
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…