Mathematics – Logic
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...313..171s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 313, Feb. 1, 1987, p. 171-184.
Mathematics
Logic
81
Continuous Spectra, Lyman Alpha Radiation, Quasars, Red Shift, Spectral Energy Distribution, Ultraviolet Spectra, Astronomical Models, Astronomical Spectroscopy, Radiant Flux Density, Spectrum Analysis
Scientific paper
Absolute spectral energy distributions have been obtained for eight very high redshift quasars (zem ≥ 2.7) with the Hale double spectrograph in the observed wavelength range 3200 - 10000 Å (typically 800 - 2500 Å in the rest frame of the quasar). It is found that the true continuum in the region of the "Lyα forest" can be represented by the extrapolation of the continuum defined longward of Lyα emission by fν ≡ ν-α, where 0.28 ≤ α ≤ 0.99. Low-resolution quasar spectra in the ultraviolet (i.e., IUE spectra) can yield apparent continuum levels which are significantly below the true continuum level. Clearly high-resolution spectra of a quasar are needed to determine whether the apparent change in the slope of the continuum shortward of Lyα emission is inherent to the quasar itself or whether it is due to a cosmological distribution of intervening material.
Sargent Wallace L. W.
Steidel Charles C.
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