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III/157 An Ultraviolet Atlas of Quasar and Blazar Spectra (Kinney+, 1991)
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An Ultraviolet atlas of Quasar and Blazar Spectra
Kinney A.L., Bohlin R.C., Blades J.C., York D.G.
<Astrophys. J. Suppl. Ser. 75, 645 (1991)>
=1991ApJS...75..645K
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ADC_Keywords: Atlases; Galaxies, Seyfert; QSOs; Spectra, ultraviolet
Abstract:
This atlas contains the ultraviolet spectra of 70 quasars, blazars,
and Seyfert 1 galaxies that were produced by combining over 100 low
resolution spectra from the International Ultraviolet Explorer (IUE)
data archive. The spectra have been extracted with an optimal
algorithm (see Kinney et al. 1991) and co-added to produce spectra
with the best possible signal-to-noise ratio.
Introduction:
The spectra file currently present in this directory are the digital
versions of the spectra that were extracted and co-added for the
Ultraviolet Atlas of Quasar and Blazar Spectra, 1991 (reference above)
The files contain the optimally extracted data which are described in
"Weighted Slit Extraction of Low Dispersion IUE spectra. The optimal
extraction is described in A. L. Kinney, R. C. Bohlin, and J. D. Neill
1991PASP..103..694K
Each co-added spectrum consists of the wavelength, quality flag, gross
flux, background flux, gross flux divided by time, absolutely
calibrated net flux, exposure time, and sigma. Details from the
headers which formerly prefixed each spectrum are in headers.dat. A
third file (objects.dat) is also available, which contains information
from Table 1 in the published paper: IAU and alternate designations,
redshift (z), V magnitude, object type, E(B-V), galactic longitude and
latitude, and number of spectra.
The file formats are mostly self explanatory. THE S-AP NOMENCLATURE
INDICATES THE SPECTRA THAT ARE NORMALIZED IN FLUX TO THE L-AP SET
(USUALLY ONE SPECTRUM, see paper for a more detailed explanation) AND
DOES *NOT* MEAN THAT THE SPECTRA WERE OBTAINED IN THE SMALL ENTRANCE
APERTURE. The camera numbers of co-added spectra are listed. Each
co-added spectrum has 8 columns of ASCII numbers with the titles.