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  • Print publication year: 2020
  • Online publication date: December 2020

5 - The Early Redshift Surveys from Arizona Observatories


Tifft and Gregory began to collect Coma cluster redshifts at Steward Observatory’s 90-inch telescope in the mid-1970s when Chincarini and Rood were doing similar work at the Kitt Peak 84-inch telescope. Tifft branched into non-cosmological redshift work while Gregory and Thompson began to collaborate. For our redshift survey work, we adopted a new strategy of mapping the galaxy distribution between two rich clusters – Coma and A1367. Another collaborative effort to study the Hercules supercluster was started by Tarenghi that involved Tifft, Chincarini, Rood, and Thompson. The Gregory and Thompson work was completed first and was submitted for publication in 1977 immediately before IAU Symposium No. 79. Chincarini took preliminary Hercules redshift data and published them on his own in Nature. A new team – Kirshner, Oemler, Schechter, and Shectman – discovered the Bootes void in 1981. Meanwhile, the first Center for Astrophysics team (CfA1) published a shallow all-sky redshift survey in 1982, and in 1986 the CfA2 team published their “Slice of the Universe” redshift map.