Open Access
Table A.1
Data model of the DESI VAC.
| Name | Format | Unit | Description |
|---|---|---|---|
| TARGETID | int64 | - | Unique DESI target ID |
| SURVEY | bytes7 | - | Survey name |
| PROGRAM | bytes7 | - | Program name |
| HEALPIX | int32 | - | Healpix number |
| SPECTYPE | bytes7 | - | Redrock spectral classification |
| RA | float64 | deg | Right ascension from target catalog |
| DEC | float64 | deg | Declination from target catalog |
| RELEASE | int16 | - | Legacy Surveys (LS) Release |
| Z | float64 | - | Redshift |
| CHI2 | float64 | - | reduced chi2 defining the quality of the fit: |
for a more reliable estimations the cut of ![$\[\mathrm{chi}_\mathrm{r}^{2} \lesssim 17\]$](/articles/aa/full_html/2024/11/aa51761-24/aa51761-24-eq28.png){kind=small} is recommended |
|||
| LOGM | float64 | log(solMass) | logarithm of the stellar mass |
| LOGM_ERR | float64 | log(solMass) | error on logarithm of the stellar mass |
| LOGSFR | float64 | log(solMass/yr) | logarithm of the star formation rate averaged over 10Myr |
| LOGSFR_ERR | float64 | log(solMass/yr) | error on logarithm of star formation rate averaged over 10Myr |
| AGNLUM | float64 | W | total luminosity of the AGN in W |
| AGNFRAC | float64 | - | fraction of the total IR emission coming from the AGN, where 0 means no AGN contribution, 1 means 100% AGN contribution |
| AGNPSY | float64 | deg | viewing angle, with ~30° and ~70°, for type 1 and type 2 AGN, respectively |
| LNU_(U/G/R/I/Z) | float64 | W/Hz | rest-frame luminosity in a given band, rest-frame magnitudes can by derived using −2.5 × log10(Lnu) + 34.1 |
| NUVR, RK,UV,VJ,GR | float64 | AB mag | rest-frame colors in given bands |
| LNU_(U/G/R/I/Z)_ERR | float64 | W/Hz | error of the rest-frame luminosity in a given band |
| (NUVR,RK,UV,VJ,GR)_ERR | float64 | AB mag | error of the rest-frame colors in given bands |
| AGE | float64 | Myr | age of the main stellar population |
| AGEERR | float64 | Myr | error of the age of the main stellar population |
| AGEM | float64 | Myr | mass-weighted age of the main stellar population |
| AGEMERR | float64 | Myr | error of the mass-weighted age of the main stellar population |
| TAU | float64 | Myr | τ of the main stellar population |
| TAUERR | float64 | Myr | τ of the main stellar population |
| FRACYSSP | float64 | - | mass fraction of young stellar population |
| FRACYSSPERR | float64 | - | error of the mass fraction of young stellar population |
| FLAG_MASSPDF | float64 | - | flag expressed by Mbest/Mbayes to reject stellar mass estimates with broad PDF and/or complex likelihood distribution, e.g., 1/5 ≲ Mbest/Mbayes ≲ 5 |
| FLAG_SFRPDF | float64 | - | flag expressed by SFRbest/SFRbayes to reject SFR estimates with broad PDF and/or complex likelihood distribution, e.g., 1/5 SFRbest/SFRbayes ≲ 5 |
| FLAGOPTICAL | int64 | - | flag to select sources observed with high S/N (S/N ≥ 10) in optical bands (grz); FLAGOPTICAL = 3(2/1/0): source is observed in 3(2/1/0) band(s) with S/N ≥ 10 |
| FLAGINFRARED | int64 | - | flag to select sources observed with high S/N (S/N ≥ 3) in WISE bands (W1, W2, W3, W4); FLAGINFRARED = 4(3/2/1/0): source is observed in 4(3/2/1/0) band(s) with S/N ≥ 3 |
| FLUX_(G/R/Z/W1-4) | float32 | nanomaggy | flux in a given band; for the reddening corrected flux use: DERED_FLUX = FLUX_BAND/MW_TRANSMISSION_BAND; for magnitude : MAG_BAND = −2.5 × log10(DERED_FLUX) + 22.5 |
| FLUX_IVAR_(G/R/Z/W1 − 4) | float32 | nanomaggy−2 | inverse variance of the flux in a given band |
| MW_TRANSMISSION_(G/R/Z/W1-4) | float32 | - | Milky Way foreground dust transmission factor [0-1] in a given band. |
| S/N_(G/R/Z/W1-4) | float32 | - | S/N in a given band calculated as: FLUX × sqrt(FLUX_IVAR) |
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