Table 2
Contamination of the different samples of passive galaxies as a function of stellar mass and redshift.
| z ≤ 0.5 | z > 0.5 | |||||||||||
| Low-mass | Med-mass | High-mass | Low-mass | Med-mass | High-mass | |||||||
|
|
||||||||||||
| median | % | median | % | median | % | median | % | median | % | median | % | |
|
|
||||||||||||
| Blue (U − B)rest | ||||||||||||
| colors | ||||||||||||
| Morphology | 0.80 | 46.3% | 0.98 | 15.5% | 1.03 | 13.6% | 0.76 | 66.7% | 0.91 | 25% | 0.95 | 12.4% |
| Red-sequence | – | – | – | – | – | – | – | – | – | – | – | – |
| Red UVJ | 0.93 | 22.6% | 1.03 | 2% | 1.01 | 0.9% | 0.91 | 31.5% | 0.88 | 19.2% | 0.95 | 10.8% |
| Red SED | 0.99 | 7.5% | 1.00 | 3% | 0.98 | 1.3% | 0.86 | 4.8% | 0.87 | 3.6% | 0.98 | 2.3% |
| Passive | – | 0.0% | 0.95 | 0.8% | 1.11 | 1.3% | 0.52 | 2.2% | 0.91 | 1.6% | 0.96 | 1.7% |
| Red and passive ETGs | – | 0.0% | – | 0.0% | – | 0.0% | – | 0.0% | 0.96 | 0.7% | 1 | 1.8% |
|
|
||||||||||||
| Nonpassive | ||||||||||||
| UVJ colors | ||||||||||||
| Morphology | 46.6% | 30.4% | 32.7% | 63% | 25.7% | 12.1% | ||||||
| Red-sequence | 23.1% | 28.2% | 29.5% | 23.3% | 24.3% | 12.7% | ||||||
| Red UVJ | – | – | – | – | – | – | ||||||
| Red SED | 8.9% | 16.5% | 18.2% | 5.8% | 5.6% | 4.6% | ||||||
| Quiescent | 1.4% | 13.6% | 22.2% | 3.3% | 3.7% | 3.6% | ||||||
| Red and passive ETGs | 3.9% | 13.2% | 10.8% | 0.0% | 1.1% | 1.5% | ||||||
|
|
||||||||||||
| Nonpassive | ||||||||||||
| IRAC colors | ||||||||||||
| Morphology | 60.1% | 26.6% | 26.0% | 60.4% | 23.3% | 7.6% | ||||||
| Red-sequence | 55.3% | 26.1% | 25.1% | 51.3% | 21.6% | 8.4% | ||||||
| Red UVJ | 55.2% | 13.6% | 9.6% | 49.6% | 18.5% | 7.2% | ||||||
| Red SED | 44.7% | 14.4% | 11% | 41.4% | 10.9% | 2.6% | ||||||
| Quiescent | 29.6% | 8.6% | 14.4% | 43.5% | 9.4% | 2.5% | ||||||
| Red and passive ETGs | 25.2% | 7% | 5.2% | 38.9% | 3.2% | 1.6% | ||||||
|
|
||||||||||||
| High sSFR | ||||||||||||
| Morphology | –0.93 | 74.6% | –1.58 | 33.3% | –1.59 | 23.7% | –0.63 | 85.4% | –1.34 | 53.8% | –1.58 | 30.3% |
| Red-sequence | –1.58 | 65.4% | –1.69 | 31.1% | –1.72 | 18.7% | –1.34 | 61.2% | –1.41 | 51.4% | –1.68 | 30.3% |
| Red UVJ | –1.48 | 65.6% | –1.70 | 18% | –1.80 | 9.9% | –1.3 | 65.8% | –1.41 | 49.3% | –1.58 | 30.1% |
| Red SED | –1.69 | 49.3% | –1.67 | 15.4% | –1.70 | 7.2% | –1.85 | 12.4% | –1.85 | 13.2% | –1.85 | 4.4% |
| Quiescent | – | – | – | – | – | – | – | – | – | – | – | – |
| Red & passive ETGs | –1.80 | 38.1% | –1.88 | 9.5% | –1.91 | 1.6% | – | 0.0% | –1.88 | 9.1% | –1.85 | 5.6% |
| Presence of | ||||||||||||
|
|
||||||||||||
| emission lines | ||||||||||||
| Morphology | –29.2 | 55.4% | –12.3 | 35.9% | –11.6 | 38.6% | –23.1 | 68.2% | –10.3 | 45.6% | –9.1 | 38% |
| Red-sequence | –14.3 | 41.8% | –11 | 33.8% | –10.9 | 36.3% | –13.4 | 39.2% | –10.5 | 43.3% | –9.2 | 38.5% |
| Red UVJ | –14.0 | 42.1% | –10.8 | 26.6% | –10.1 | 28.7% | –16.5 | 46.2% | –10.7 | 41.7% | –9.2 | 37.9% |
| Red SED | –12.2 | 30.4% | –9.2 | 27.8% | –9.5 | 28.9% | –8.6 | 10.75% | –7.9 | 21.6% | –8.3 | 23% |
| Quiescent | –12.0 | 20.7% | –9.4 | 25.9% | –10.4 | 31.4% | –13.4 | 14.1% | –8.3 | 21.2% | –8.4 | 26.6% |
| Red and passive ETGs | – | – | – | – | – | – | – | – | – | – | – | – |
|
|
||||||||||||
| Nonelliptical | ||||||||||||
| morphology | ||||||||||||
| Morphology | – | – | – | – | – | – | – | – | – | – | – | – |
| Red-sequence | 2.1 | 60.8% | 2.1 | 39% | 2.1 | 22.8% | 2.1 | 67.2% | 2.1 | 55.4% | 2.1 | 31.5% |
| Red UVJ | 2.1 | 60.6% | 2.1 | 31% | 2.1 | 15.2% | 2.1 | 67.3% | 2.1 | 52.7% | 2.1 | 29.9% |
| Red SED | 2.1 | 51.9% | 2.1 | 30% | 2.1 | 18.9% | 2.1 | 59.6% | 2.1 | 44.8% | 2.1 | 22.9% |
| Quiescent | 2.1 | 50.2% | 2.1 | 31.4% | 2.1 | 18.6% | 2.1 | 63% | 2.1 | 45.7% | 2.1 | 23.7% |
| Red and passive ETGs | 2.1 | 34.8% | 2.1 | 25.7% | 2.1 | 11.3% | 2.1 | 77.8% | 2.1 | 40.7% | 2.1 | 15.1% |
Notes. The table reports the median values of colors, sSFR, equivalent widths and morphology for the galaxies having blue colors, high specific star formation rates, significant emission lines and late-type morphologies as defined in Sect. 4.1, and the percentage relative to each subsample. The low-mass bin refers to log (M/M⊙) < 10.25, the med-mass bin to 10.25 < log (M/M⊙) < 10.75, and the high-mass bin to log (M/M⊙) > 10.75. As defined in the text, the emission lines reported are the median restframe equivalent widths (in units of [Å]) of Hα for z ≤ 0.5 and of [OII] for z > 0.5; by convention, the emission lines are quoted with negative values.
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