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Home All issues Volume 677 (September 2023) A&A, 677 (2023) A143 Full HTML
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Table 1.

Best-fit values for the Fall relation using the groups’ richness as density estimate.

Cut Sub-sample Nb. galaxies α β 95% CI
(1) (2) (3) (4) (5) (6)
Mass model None Field 85 0.50 2.80 2.73, 2.86
Large 75 2.68 2.62, 2.74
Mass Field 67 0.83 2.96 2.89, 3.04
Large 36 2.84 2.73, 2.95
Redshift Field 33 0.52 2.76 2.67, 2.86
Large 66 2.68 2.61, 2.75
Both Field 27 0.80 2.92 2.81, 3.02
Large 30 2.81 2.71, 2.92
Flat model None Field 85 0.55 2.73 2.65, 2.80
Large 75 2.55 2.48, 2.62
Mass Field 67 0.94 2.92 2.83, 2.99
Large 36 2.74 2.62, 2.87
Redshift Field 33 0.57 2.66 2.54, 2.78
Large 66 2.52 2.44, 2.60
Both Field 27 0.91 2.86 2.74, 2.99
Large 30 2.74 2.60, 2.88

Notes. (1) Selection cut applied, (2) sub-sample (i.e., galaxies in the field or in rich groups), (3) number of galaxies in the sub-sample, (4) best-fit slope, (5) best-fit zero point, and (6) jackknife resampling-derived 95% confidence intervals for the best-fit zero point. The same slope was used for both sub-samples. It was derived by fitting first with a free slope the entire sample with the considered selection cuts applied. The stellar mass cut selects galaxies according to M⋆ < 1010 M⊙ and the redshift cut according to 0.5 < z < 0.9. Boldface values represent the main scientific results of the analysis. Other values are provided to separate the effects of stellar mass, redshift, and environment.

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