We are approaching the 50th anniversary of the discovery of quasars. Those old enough to have been cognizant of astronomy in 1962–1963 can remember the sense of excitement connected with this finding. There was talk of a major new constituent of the universe. The excitement of the discovery was palpable even to one of us (the most senior of the editors) who was then a high school teenager.

Quasars in the life of astronomers

We present multicolor broad band (BVRI) photometry for a sample of 11 mixed morphology (E/S0+S) binary galaxies drawn from the Karachentsev Catalogue of Isolated Pairs of Galaxies (KPG). The data is part of an observational programme devoted to the systematic photometric study of one of the most complete and homogeneous pair samples available in the literature. We present B band, B-filtered images, B, V, R and I surface brightness and (B - V), (B - R) and (B - I) color profiles as well as geometric (∈ = 1 - b/a, PA and a 4 /a) profiles for each component pair. In addition, integrated corrected B, V, R and I magnitudes and integrated (B - V), (B - R) and (B - I) colors are also presented. Internal and external data comparisons show consistency within the estimated errors. Most of this subsample have photometric parameters homogeneously derived for the first time. Geometric profiles from our surface photometry along with the broad-band imaging and color information have been used to re-evaluate morphology in all pairs. We find an important number of true mixed pairs with 5/11 (E+S) pairs in the present sample. The remaining objects include 3 disky pairs (composed of SO and S members), 2 early-type pair comprising E and S0 members and I spiral-irregular pair. The measurements will be used in a series of forthcoming papers where we try to identify and isolate the main structural and photometric properties of disk and elliptical galaxies at different stages of interaction.

/pdf/bvri-surface-photometry-of-mixed-morphology-pairs-of-4kt3230s3i.pdf

BVRI surface photometry of mixed morphology pairs of galaxies: II. The second data set

Color Correlations Between Paired Galaxies - the Holmberg Effect

Some Properties of Seyfert-Galaxy Nuclei and the Integrated Parameters of the Galaxies.

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Color Correlations Between Paired Galaxies - the Holmberg Effect

Some Properties of Seyfert-Galaxy Nuclei and the Integrated Parameters of the Galaxies.