Statistics
Scientific paper
Dec 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975pasp...87..853s&link_type=abstract
Astronomical Society of the Pacific, Publications, vol. 87, Dec. 1975, p. 853-857.
Statistics
20
Astronomical Photometry, Galactic Clusters, Interstellar Extinction, Interstellar Matter, Galaxies, Radio Galaxies, Spectral Line Width
Scientific paper
The ratio of total extinction to reddening of interstellar matter has been determined by a method applied to galaxies in the highly obscured 3C 129 and 3C 129.1 group. The difference between the observed magnitude of the first-ranked group member and the magnitude calculated from the redshift-apparent magnitude diagram (at the known redshift of the group) is the total extinction to within the dispersion in magnitude that applies to the first-ranked cluster member. Comparison of the observed color with the known intrinsic color of giant E galaxies gives the color excess and, therefore, the ratio of total extinction to reddening. Photometry of the 3C 129 group gives a ratio of 3.72 plus or minus 0.32; correction for the finite bandwidth of the BV system gives a ratio (O-star base) of 3.35 plus or minus 0.29. Comparison with the ratio determined from the color-difference method gives a limit for the fraction of neutral-to-selective extinction which is a null result to within the statistics. Hence, no neutral extinction has been detected at the one-sigma level of the experiment. Use of the method on many additional groups of galaxies is expected to reduce the error of this limit substantially.
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