منابع مشابه
Far-Ultraviolet Spectra of AGN: First Results from FUSE
Composite spectra derived from HST observations of moderate redshift (z ∼ 1) quasars show that the peak of the spectral energy distribution is at ∼1000 Å, and that the ionizing continuum falls off smoothly to shorter wavelengths as fν ∼ ν −1.8. HUT and FUSE observations of nearby AGN (e.g., 3C 273) show similar results. FUSE spectra reveal a wealth of detail in the 912–1200 Å spectral range, in...
متن کاملDeuterium toward the White Dwarf Wd0621−376: Results from the Far Ultraviolet Spectroscopic Explorer (fuse) Mission
Far Ultraviolet Spectroscopic Explorer observations are presented for WD0621−376, a DA white dwarf star in the local interstellar medium (LISM) at a distance of about 78 pc. The data have a signal-tonoise ratio of ∼20–40 per 20 km s resolution element and cover the wavelength range 905–1187 Å. LISM absorption is detected in the lines of D I, C II, C II*, C III, N I, N II, N III, O I, Ar I, and ...
متن کاملDeuterium toward Wd 1634-573: Results from the Far Ultraviolet Spectroscopic Explorer (fuse) Mission
We use Far Ultraviolet Spectrocopic Explorer (FUSE) observations to study interstel-lar absorption along the line of sight to the white dwarf WD 1634-573 (d = 37.1±2.6 pc).
متن کاملDeuterium Abundance toward Wd2211−495 : Results from the Far Ultraviolet Spectroscopic Explorer (fuse) Mission
We present a deuterium abundance analysis of the line of sight toward the white dwarf WD2211−495 observed with the Far Ultraviolet Spectroscopic Explorer (FUSE). Numerous interstellar lines are detected on the continuum of the stellar spectrum. A thorough analysis was performed through the simultaneous fit of interstellar absorption lines detected in the four FUSE channels of multiple observati...
متن کاملConstraints on the Lyman continuum radiation from galaxies : first results with FUSE on Mrk 54 ?
We present Far Ultraviolet Spectroscopic Explorer observations of the star-forming galaxy Mrk 54 at z = 0.0448. The Lyman continuum radiation is not detected above the H i absorption edge in our Galaxy. An upper limit is evaluated by comparison with the background measured in regions of the detector adjacent to the observed spectrum. A spectral window of 16 Å, reasonably free of additional H i ...
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ژورنال
عنوان ژورنال: Highlights of Astronomy
سال: 2002
ISSN: 1539-2996
DOI: 10.1017/s1539299600014313