Open Access
Table 1.
Selection of the HectoMAP Subsample.
| SDSS r-band magnitude limit | 23 |
|---|---|
| Nspec, tot | 95 403 |
| Color selection (cs) | g − r > 1, for r < 20.5 |
| g − r > 1 and r − i > 0.5, | |
| for 20.5 < r < 21.3 | |
| Nspec, cs | 74 365 |
| Nspec, cs, M★ | 72 110 |
| Nspec, cs, M★, Dn4000 | 69 563 (a) |
| Nspec, cs, M★, Dn4000 > 1.5 | 51 274 |
| z selection for mass-limited sample | (0.2, 0.6) (b) |
| Nmass − limited sample | 39 468 |
| grizy fits | 28 128 (c) |
| With Re < 0.5×seeing | 26 912 |
Notes.
(a)
Criteria for reliable Dn4000 measurements are in Sect. 2.1.
b
We remove galaxies with 0.4 < z < 0.42 because of night sky line contamination (Damjanov et al. 2025).
c
HSC-SSP coverage of the HectoMAP field is ∼80% for the i and y bands, and 100% for the g, r, and z bands (Sect. 3.1).
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