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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