Schemes based on these correlate reasonably well with one another

Schemes based on these correlate reasonably well with one another

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Schemes based on these correlate reasonably well with one another. Zwicky distinguished compact, medium-compact, and open clusters, with or without strong central concentrations. The Rood and Sastry (RS) classification is based on the projected distribution of the brightest 10 members (being appropriately cautious about possible interlopers). They recognize these types: cD - single dominant cD galaxy ( A2029 , A2199 ) C - single core of galaxies B - dominant binary, like Coma F - flattened ( IRAS 09104+4109 ) L - linear array of galaxies ( Perseus ) I - irregular distribution (
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Unformatted text preview: Hercules ) These appear to have affinities in a tuning-fork pattern: with concentration generally increasing leftward. However, some poor clusters do have cD galaxies, perhaps the result of runaway merging. The Bautz-Morgan classification is based on brightness contrast between first- and second-ranked galaxies (i.e. the slope of the luminosity function at the bright end): I central cD galaxy (A2199) II intermediate E/cD (Coma) III no dominant galaxy (Virgo, Hercules) Intermediate stages I-II,II-II are recognized....
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This note was uploaded on 11/10/2011 for the course AST AST1002 taught by Professor Emilyhoward during the Fall '10 term at Broward College.

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