Open Access
Table 2.
Main spectral indices and physical properties of XBGs and red galaxies.
| Diagnostic | XBGs | Red galaxies |
|---|---|---|
| EW(Hα) | 450 ± 80 Å | 420 ± 20 Å |
| EW(Hβ) | 70 ± 8 Å | 69 ± 6 Å |
| EW([OIII]5007) | 450 ± 50 Å | 480 ± 30 Å |
| EW(HeII1640) | 3.8 ± 0.7 Å | < 2.5 Å |
| EW(CIII]1908) | 4.8 ± 1.2 Å | 8.6 ± 0.7 Å |
| Hα/Hβ | 3.0 ± 0.3 | 3.5 ± 0.2 |
| R2 | −0.07 ± 0.05 | 0.06 ± 0.03 |
| R3 | 0.77 ± 0.04 | 0.80 ± 0.03 |
| R23 | 0.94 ± 0.03 | 0.98 ± 0.03 |
| O3 | 1.3 ± 0.2 | > 2.1 |
| O32 | 0.97 ± 0.04 | 0.87 ± 0.02 |
| Ne3O2 | −0.01 ± 0.04 | −0.28 ± 0.02 |
| 1.07 ± 0.02 | 1.27 ± 0.01 | |
| Physical parameter | XBGs | Red galaxies |
| log(U) | −2.11 ± 0.03 | −2.20 ± 0.02 |
| Zneb/Z⊙ (strong line) | 0.105 ± 0.006 | 0.157 ± 0.004 |
| Zneb/Z⊙ (direct) | 0.09 ± 0.01 | – |
| log M*/M⊙ (average) | 8.0 (σ = 0.8) | 8.6 (σ = 0.6) |
Notes. Table highlighting the main spectral properties (first column) inferred from the stacked spectra of XBGs (second column) and red galaxies (third column).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.