Colour–magnitude selection criteria for the DESI LRG targets (Zhou et al. 2023a). Magnitudes are corrected for Galactic extinction. The z-band fibre magnitude, zfibre, corresponds to the expected flux within a DESI fibre.
| Footprint . | Criterion . | Description . |
|---|---|---|
| zfibre < 21.7 | Faint limit | |
| DECaLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.3) AND ((g − r) > −1.55*(r − W1) + 3.13)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.26)*1.8) AND (r − W1 > W1 − 16.36)] OR (r − W1 > 3.29) | Luminosity cut | |
| zfibre < 21.71 | Faint limit | |
| BASS + MzLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.34) AND ((g − r) > −1.55*(r − W1) + 3.23)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.24)*1.83) AND (r − W1 > W1 − 16.33)] OR (r − W1 > 3.39) | Luminosity cut |
| Footprint . | Criterion . | Description . |
|---|---|---|
| zfibre < 21.7 | Faint limit | |
| DECaLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.3) AND ((g − r) > −1.55*(r − W1) + 3.13)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.26)*1.8) AND (r − W1 > W1 − 16.36)] OR (r − W1 > 3.29) | Luminosity cut | |
| zfibre < 21.71 | Faint limit | |
| BASS + MzLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.34) AND ((g − r) > −1.55*(r − W1) + 3.23)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.24)*1.83) AND (r − W1 > W1 − 16.33)] OR (r − W1 > 3.39) | Luminosity cut |
Colour–magnitude selection criteria for the DESI LRG targets (Zhou et al. 2023a). Magnitudes are corrected for Galactic extinction. The z-band fibre magnitude, zfibre, corresponds to the expected flux within a DESI fibre.
| Footprint . | Criterion . | Description . |
|---|---|---|
| zfibre < 21.7 | Faint limit | |
| DECaLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.3) AND ((g − r) > −1.55*(r − W1) + 3.13)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.26)*1.8) AND (r − W1 > W1 − 16.36)] OR (r − W1 > 3.29) | Luminosity cut | |
| zfibre < 21.71 | Faint limit | |
| BASS + MzLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.34) AND ((g − r) > −1.55*(r − W1) + 3.23)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.24)*1.83) AND (r − W1 > W1 − 16.33)] OR (r − W1 > 3.39) | Luminosity cut |
| Footprint . | Criterion . | Description . |
|---|---|---|
| zfibre < 21.7 | Faint limit | |
| DECaLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.3) AND ((g − r) > −1.55*(r − W1) + 3.13)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.26)*1.8) AND (r − W1 > W1 − 16.36)] OR (r − W1 > 3.29) | Luminosity cut | |
| zfibre < 21.71 | Faint limit | |
| BASS + MzLS | z − W1 > 0.8 × (r − z) − 0.6 | Stellar rejection |
| [(g − r > 1.34) AND ((g − r) > −1.55*(r − W1) + 3.23)] OR (r − W1 > 1.8) | Remove low-z galaxies | |
| [(r − W1 > (W1 − 17.24)*1.83) AND (r − W1 > W1 − 16.33)] OR (r − W1 > 3.39) | Luminosity cut |
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