Abell galaxy cluster magnitudes and the Hubble diagram

Details Abell galaxy cluster magnitudes and the Hubble diagram Abell galaxy cluster magnitudes and the Hubble diagram

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974aj.....79.1356c&link_type=abstract

Astronomical Journal, vol. 79, Dec. 1974, p. 1356-1364.

Astronomy and Astrophysics

Astronomy

80

Astronomical Models, Galactic Clusters, Hubble Diagram, Red Shift, Astronomical Photometry, Electrophotometry, Error Analysis, Radiant Flux Density, Tables (Data)

Scientific paper

Corrections to the magnitudes estimated by Abell for the tenth-brightest members of rich clusters are necessary because of (1) a Bautz-Morgan effect, (2) the richness of the cluster, and (3) scale error. The corrections for the Bautz-Morgan effect and richness are derived via the Hubble diagram. Richness is found to affect Abell's magnitudes significantly, although the Bautz-Morgan effect is nearly negligible at the level of the tenth-brightest cluster members. The scale correction is found by comparison of Abell's magnitudes with those by Sandage and Hardy (1973) for first-brightest cluster members. A catalog of redshifts and corrected magnitudes for 111 Abell clusters is included. The slope of the Hubble line using completely corrected Abell magnitudes is 5.09 plus or minus 0.15.

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