Variable quasi-stellar objects. I - Photometry and completeness of faint blue objects in the Sandage-Luyten survey field 8h48m, +18 deg

Details Variable quasi-stellar objects. I - Photometry and completeness of faint blue objects in the Sandage-Luyten survey field 8h48m, +18 deg Variable quasi-stellar objects. I - Photometry and completeness of faint blue objects in the Sandage-Luyten survey field 8h48m, +18 deg

May 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...222...40u&link_type=abstract

Astrophysical Journal, Part 1, vol. 222, May 15, 1978, p. 40-53.

Mathematics

Probability

54

Astronomical Catalogs, Astronomical Photometry, Cosmology, Quasars, Error Analysis, Hubble Diagram, Luminous Intensity, Photographic Plates, Probability Distribution Functions, Statistical Analysis

Scientific paper

Palomar Schmidt plates were used to study the optical variability of 820 LB objects which are brighter than approximately the 19th magnitude and which are found in the Sandage-Luyten survey field 8h48m, +18 deg. About 70% of the objects selected for both blueness and variability were found to be QSO, and the count gradient between the 17th and 18th magnitude is about 6.7. Forty-nine additional blue objects were detected with the help of the original three-color survey plate, and incremental correction factors to the initially calculated surface densities of LB QSO were derived. Positions, magnitudes, estimated colors, and finding charts are provided for the 49 sources. The faint limit on the Hubble diagrams is extended by over 1.5 mag to approximately the 19th magnitude, and the dispersion in the Hubble diagram is so large that a major intrinsic heterogeneity among QSO seems possible.

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