Double galaxy investigations. I – Observations

Abstract

Redshift information from 240 A/mm spectrograms is presented for 370 double arcsec galaxy systems from the Karachentsev (1972) catalog, including all pairs in that catalog with separation less than 80 arcsec. An extensive error discussion utilizing internal and external (21 cm) comparisons provides calibration of systematic error and determines the uncertainty for a typical high weight optical redshift to be plus or minus 65 km/sec. Internal differential redshifts within single spectra using common lines achieve accuracies of 18-30 km/sec, depending upon separation, and are available for about 200 pairs. Extensive information on emission and other properties is also provided.

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