Search Publications
Deuterium Abundance toward WD 0621-376: Results from the FUSE Mission
Sembach, K. R.; Moos, H. W.; Chayer, P. +5 more
Far Ultraviolet Spectroscopic Explorer observations are presented for WD 0621-376, a DA white dwarf star in the local interstellar medium (LISM) at a distance of about 78 pc. The data have a signal-to-noise ratio of ~20-40 per 20 km s-1 resolution element and cover the wavelength range 905-1187 Å. LISM absorption is detected in the line…
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…
X-Ray Light Curves of Gamma-Ray Bursts Detected with the All-Sky Monitor on RXTE
Hurley, K.; Smith, D. A.; Levine, A. +6 more
We present X-ray light curves (1.5-12 keV) for 15 gamma-ray bursts (GRBs) detected by the All-Sky Monitor (ASM) on the Rossi X-Ray Timing Explorer. We compare these soft X-ray light curves with count rate histories obtained by the high-energy (>12 keV) experiments BATSE, Konus-Wind, the BeppoSAX Gamma-Ray Burst Monitor, and the burst monitor on…
Speckle Observations of Composite Spectrum Stars with PISCO in 1993-1998
Festou, M. C.; Arnold, L.; Scardia, M. +8 more
We present speckle interferometry observations of 47 composite spectrum stars obtained between 1993 and 1998 at the Pic du Midi Observatory with the PISCO speckle camera. 76% of over 150 independent 10 minute sequences of observations led to a companion detection. Binary component angular separations ranged from 0.05" to 1.2". We also obtained a s…
A New Database of Observed Spectral Energy Distributions of Nearby Starburst Galaxies from the Ultraviolet to the Far-Infrared
Gordon, Karl D.; Calzetti, Daniela; Clayton, Geoffrey C. +3 more
We present a database of UV-to-FIR data of 83 nearby starburst galaxies. The galaxies are selected based upon the availability of IUE data. We have recalibrated the IUE UV spectra for these galaxies by incorporating the most recent improvements. For 45 of these galaxies we use observations by Storchi-Bergmann et al. and McQuade et al. for the spec…
An Empirical Ultraviolet Template for Iron Emission in Quasars as Derived from I Zwicky 1
Vestergaard, M.; Wilkes, B. J.
We present an empirical template spectrum suitable for fitting and subtracting/studying the Fe II and Fe III emission lines in the rest frame ultraviolet spectra of quasars and active galactic nuclei, the first empirical ultraviolet iron template to cover the full range of 1250-3090 Å. Iron emission is often a severe contaminant in optical-ultravi…
The Distribution of Thermal Pressures in the Interstellar Medium from a Survey of C I Fine-Structure Excitation
Tripp, Todd M.; Jenkins, Edward B.
We used the Space Telescope Imaging Spectrograph (STIS) with its smallest entrance aperture (0.03" wide slit) and highest resolution echelle gratings (E140H and E230H) to record the interstellar absorption features for 10 different multiplets of neutral carbon at a resolving power of λ/Δλ=200,000 in the UV spectra of 21 early-type stars. Our objec…
CHIANTI-An Atomic Database for Emission Lines. IV. Extension to X-Ray Wavelengths
Young, P. R.; Del Zanna, G.; Dere, K. P. +1 more
CHIANTI provides a database of atomic energy levels, wavelengths, radiative transition probabilities, and electron excitation data for a large number of ions of astrophysical interest. It also includes a suite of Interactive Data Language programs to calculate optically thin synthetic spectra and to perform spectral analysis and plasma diagnostics…
NICMOS Observations of High-Redshift Radio Galaxies: Witnessing the Formation of Bright Elliptical Galaxies?
Pentericci, L.; Fosbury, R.; Röttgering, H. J. A. +3 more
We present the results of a near-infrared imaging program of a sample of 19 radio galaxies with redshift between 1.7 and 3.2, using the NICMOS Camera 2 on the Hubble Space Telescope (HST). The galaxies were observed in H band, which, for 18 of the 19 targets, samples the rest-frame optical emission longward of the 4000 Å break. For many sources th…
The MACHO Project: Microlensing Detection Efficiency
Alcock, C.; Allsman, R. A.; Alves, D. R. +21 more
The MACHO project is a search for dark matter in the form of massive compact halo objects (MACHOs). The project has photometrically monitored over forty million stars in the Large Magellanic Cloud (LMC), Small Magellanic Cloud (SMC), and Galactic bulge in search of rare gravitational microlensing events caused by these otherwise invisible objects.…