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III/157    An Ultraviolet Atlas of Quasar and Blazar Spectra   (Kinney+, 1991)

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
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. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file headers.txt 80 403 Information from original headers objects.dat 60 70 Details on objects included sp/* 80 70 Co-added spectra
See also: VI/110 : Final Merged Log of IUE Observations (NASA-ESA, 2000) Byte-by-byte Description of file: objects.dat
Bytes Format Units Label Explanations
1- 2 I02 --- Seq Sequence number 5- 12 A8 --- QSO IAU designation 14- 22 A9 --- Name Alternate designation 24- 28 F5.3 km/s z ? Redshift z 29 A1 --- n_z [a:] Redshift from Veron+Veron 31- 35 F5.2 mag Vmag V magnitude 37- 39 A3 --- Type Type QSO (quasar) SY1 (Seyfert type I) or BLZ (blazar) 41- 44 F4.2 mag E(B-V) Color excess 45- 51 F7.2 deg GLON Galactic longitude 52- 57 F6.2 deg GLAT Galactic latitude 59- 60 I2 --- Ns Number of spectra used for the Atlas.
Byte-by-byte Description of file: sp/*
Bytes Format Units Label Explanations
1- 8 A8 --- QSO Identification 10- 15 F6.1 0.1nm lambda Wavelength 17- 22 F6.0 --- Qual Quality flag 23- 31 F9.0 --- gFlux Gross flux 34- 40 F7.0 --- bFlux Background flux 45- 50 F6.2 --- net/s Gross-background divided by time 51- 60 E10.3 10mW/m2/nm Flux Absolute calibrated net flux 62- 70 F9.2 s ExpTime Exposure time 74- 80 F7.4 --- sigma *(Example: 2.1 = 210 percent)
Note on sigma: The SIGMA is the RMS scatter among the co-added spectra at each wavelength. In qso70.dat, a zero has been added to byte 80 to permit reading this file with the same format as that for the other files. This zero should be ignored.
History: * February 1992: the Spectra were kindly provided by Anne L. Kinney * 22-Apr-1992: the file objects.dat was added by the CDS. * 01-Sep-1995: description standardized (Nancy G. Roman) The file headers.txt is best read as a straight ASCII file. Acknowlegements: The undersigned (Nancy G. Roman) thanks Ralph Bohlin for providing this version of the catalog and substantial advice. She also thanks Arthur Davidson for providing the information on 1700+643.
(End) Nancy G. Roman [ADC/SSDOO] 01-Sep-1995
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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