Search Publications
The Properties of the Local Interstellar Medium and the Interaction of the Stellar Winds of epsilon INDI and lambda Andromedae with the Interstellar Environment
Wood, Brian E.; Linsky, Jeffrey L.; Alexander, William R.
We present new observations of the Lyα lines of ɛ Indi (KS V) and λ Andromedae (G8 IV-III + ?). These data were obtained by the Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope. Analysis of the interstellar H I and D I absorption lines reveals that the velocities and temperatures inferred from the H I lines are inconsisten…
The Hubble Space Telescope Quasar Absorption Line Key Project: The Unusual Absorption-Line System in the Spectrum of PG 2302+029---Ejected or Intervening?
Savage, B. D.; Boksenberg, A.; Sargent, W. L. W. +9 more
We report the discovery of a high-ionization broad absorption line system at a redshift of zabs = 0.695 in the spectrum of the zem = 1.052 radio-quiet quasar PG 2302+029. Broad absorption with FWHM from 3000 to 5000 km s-1 is detected from C IV, N V, and O VI in Hubble Space Telescope (HST) Faint Object Spectrograph spectra of the quasar. A narrow…
Multiwavelength Data Suggest a Cyclotron Feature on the Hot Thermal Continuum of Geminga
Bowyer, Stuart; Caraveo, Patrizia A.; Bignami, Giovanni F. +2 more
A new set of ground-based optical, HST, UV, and EUVE data on Geminga are presented. The object, identified with a high proper motion isolated neutron star (INS), is seen to emit thermal radiation with a temperature in the range (2.2--2.8) x 105 K. This is compatible with the global thermal emission from the surface of a standard neutron star of Ge…
The Host Galaxies of IRAS-selected Quasi-stellar Objects
Boksenberg, A.; Macchetto, F. D.; Crane, P. +6 more
We present Hubble Space Telescope (HST) images of three QSOs selected on the basis of their IRAS properties. The data were taken with the Planetary Camera primarily in order to examine the host galaxies. All three QSOs appear embedded in spectacular interactions between two or more luminous galaxies, probably spirals. We discuss the evolutionary c…
X-Ray Emission from the Wind-blown Bubble in the Planetary Nebula BD +30 degrees 3639
Borkowski, Kazimierz J.; Arnaud, Keith; Harrington, J. Patrick
An X-ray spectrum of a wind-blown bubble in the planetary nebula BD +30 deg3639, acquired by the Advanced Satellite for Cosmology and Astrophysics (ASCA), shows the presence of hot (T = 3 x 106 K) gas dominated by the Ne K alpha line complex. There is circumstantial evidence for the enhanced abundances of other H- and He-burning products, although…
Corona(e) of AR Lacertae. II. The Spatial Structure
White, N. E.; Singh, K. P.; Siarkowski, M. +2 more
The X-ray light curves in the 0.4-1.5 keV and 2-7 keV bands of the RS CVn binary AR Lacertae observed on 1993 June 1-3 over one full orbital cycle with the ASCA satellite have been used to map the spatial structure of AR Lac's coronae. We find that both stars are X-ray active, that the corona of the K-type secondary star appears to be hotter than …
Optical Structure in the Abell 1795 Cluster Central Galaxy: Evidence for Stripping and Deflection of Radio Jets
Sarazin, Craig L.; McNamara, Brian R.; Jannuzi, Buell T. +2 more
We have obtained a deep U-band image of the central ~100 kpc of the Abell 1795 cluster central galaxy. This image shows several faint ( mu U ~ 23--24 mag arcsec-2), thin structures, of unknown origin, that extend between 20 and 70 kpc into the galaxy's halo. Some are located along filaments of nebular line emission. Two structures, detected in the…
The Cooling White Dwarf in VW Hydri after Normal Outburst and Superoutburst: HST Evidence of a Sustained Accretion Belt
Szkody, Paula; Sion, Edward M.; Hubeny, Ivan +2 more
Hubble Faint Object Spectrograph (FOS) observations of VW Hyi one day after the end of a normal dwarf nova outburst reveal a heated white dwarf with deep, broad Ly alpha , narrow metallic absorption features, and evidence of a hotter Keplerian-broadened component manifested in quiescence as a broad continuum hump. Our best reduced chi 2 fit to the…
Hubble Space Telescope Observations of the Gravitational Lens System B1422+231
Impey, C. D.; Browne, I. W. A.; Petry, C. E. +2 more
Hubble Space Telescope observations of the gravitational lens system B1422+231 are presented. The spectra of the four components are virtually identical, although there are differences among the Ly alpha emission-line equivalent widths that might be due to microlensing. There are also significant differences between the component flux density rati…
The Apparently Normal Galaxy Hosts for Two Luminous Quasars
Schneider, Donald P.; Bahcall, John N.; Kirhakos, Sofia
HST images (with WFPC2) of PHL 909 (z = 0.171) and PG 0052+251 (z = 0.155) show that these luminous radio-quiet quasars each occur in an apparently normal host galaxy. The host galaxy of PHL 909 is an elliptical galaxy (∼E4), and the host of PG 0052+251 is a spiral (∼Sb). Both host galaxies are several tenths of a magnitude brighter than L*