Table 3.
Definitions and selection criteria for all activity classes based on the refined classification scheme (DONHa diagnostic).
| Class name | Definition | Criterion |
|---|---|---|
| Pure starburst | Dominant photoionization source | max_pi ≥ 90% to be starburst |
| young massive stars. | ||
| Pure AGN | Dominant photoionization source | max_pi ≥ 90% to be AGN |
| active nucleus. | ||
| Pure passive | Dominant photoionization source | max_pi ≥ 90% to be passive |
| hot evolved stellar populations. | ||
| Starburst-AGN | Star formation and an active nucleus. | max_pi < 90% to be starburst, while the second |
| Dominant of the two is star formation. | higher predicted probability is AGN. | |
| AGN-starburst | Star formation and an active nucleus. | max_pi < 90% to be AGN, while the second |
| Dominant of the two is an active nucleus. | higher predicted probability is starburst. | |
| Starburst-passive | Star formation and hot evolved stars. | max_pi < 90% to be starburst, while the second |
| Dominant of the two is star formation. | higher predicted probability is passive. | |
| Passive-starburst | Star formation and hot evolved stars. | max_pi < 90% to be passive, while the second |
| Dominant of the two is hot evolved stars. | higher predicted probability is starburst. | |
| AGN-passive | Hot evolved stars and an active nucleus. | max_pi < 90% to be AGN, while the second |
| Dominant of the two is active nucleus. | higher predicted probability is passive. | |
| Passive-AGN | Hot evolved stars and active nucleus. | max_pi < 90% to be passive, while the second |
| Dominant of the two is hot evolved stars. | higher predicted probability is AGN. | |
| Inconclusive | All three classes have similar probabilities | See Sect. 5.2 for a discussion. |
Notes. The max_pi refers to the probability of the highest-ranking class assigned to a galaxy by our classifier. In the case of mixed-activity classes, the first class in each label represents the primary class (with the highest predicted probability), while the second class represents the secondary class (with the second-highest predicted probability).
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