zpix-SURVEY-PROGRAM-imaging.fits
- Summary:
Legacy Survey imaging photometry columns from the healpix-based redshift catalogs, one file per SURVEY and PROGRAM.
- Naming Convention:
zcatalog/v2/SURVEY/zpix-SURVEY-PROGRAM-imaging.fits, whereSURVEYis e.g.mainorsv1andPROGRAMis e.g.brightordark.- Regex:
zpix-(cmx|main|sv1|sv2|sv3|special)-(backup|bright|dark|other)-imaging\.fits- File Type:
FITS, ~200 MB
Contents
Number |
EXTNAME |
Type |
Contents |
|---|---|---|---|
PRIMARY |
IMAGE |
Empty |
|
ZCATALOG_IMAGING |
BINTABLE |
Legacy Survey imaging photometry columns |
FITS Header Units
HDU0
EXTNAME = PRIMARY
Required Header Keywords
Required Header Keywords Table
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
CHECKSUM |
9aaGCVYE9aaECUYE |
str |
HDU checksum |
DATASUM |
0 |
str |
data unit checksum |
ZCATVER |
v2 |
str |
Version of zcatalog files |
Empty HDU.
HDU1
EXTNAME = ZCATALOG_IMAGING
Legacy Survey (LS) imaging photometry columns for each entry in the corresponding zpix-SURVEY-PROGRAM.fits file. Rows are in the same order and correspond 1-to-1 with the ZCATALOG HDU.
Required Header Keywords
Required Header Keywords Table
KEY |
Example Value |
Type |
Comment |
|---|---|---|---|
NAXIS1 |
228 |
int |
width of table in bytes |
NAXIS2 |
139728 |
int |
number of rows in table |
SURVEY [1] |
main |
str |
DESI sub-survey (e.g. sv1, sv3, main) |
PROGRAM [1] |
dark |
str |
DESI program (e.g. dark, bright) |
CHECKSUM |
QA6lQ26iQ96iQ96i |
str |
HDU checksum |
DATASUM |
4284326946 |
str |
data unit checksum |
ZCATVER |
v2 |
str |
Version of zcatalog files |
Required Data Table Columns
Name |
Type |
Units |
Description |
|---|---|---|---|
TARGETID |
int64 |
Unique DESI target ID |
|
HEALPIX |
int32 |
HEALPixel containing this location at NSIDE=64 in the NESTED scheme |
|
PMRA |
float32 |
mas yr^-1 |
Reference catalog proper motion in the RA direction |
PMDEC |
float32 |
mas yr^-1 |
Reference catalog proper motion in the Dec direction |
REF_EPOCH |
float32 |
yr |
Reference catalog reference epoch (e.g., 2015.5 for Gaia DR2) |
RELEASE |
int16 |
||
BRICKNAME |
char[8] |
Brick name from tractor input |
|
BRICKID |
int32 |
Brick ID from tractor input |
|
BRICK_OBJID |
int32 |
OBJID (unique to brick, but not to file) |
|
MORPHTYPE |
char[4] |
Morphological Model type |
|
EBV |
float32 |
mag |
Galactic extinction E(B-V) reddening from SFD98 |
FLUX_G |
float32 |
nanomaggy |
LS flux from tractor input (g) |
FLUX_R |
float32 |
nanomaggy |
LS flux from tractor input (r) |
FLUX_Z |
float32 |
nanomaggy |
LS flux from tractor input (z) |
FLUX_W1 |
float32 |
nanomaggy |
WISE flux in W1 |
FLUX_W2 |
float32 |
nanomaggy |
WISE flux in W2 |
FLUX_IVAR_G |
float32 |
nanomaggy^-2 |
Inverse Variance of FLUX_G |
FLUX_IVAR_R |
float32 |
nanomaggy^-2 |
Inverse Variance of FLUX_R |
FLUX_IVAR_Z |
float32 |
nanomaggy^-2 |
Inverse Variance of FLUX_Z |
FLUX_IVAR_W1 |
float32 |
nanomaggy^-2 |
Inverse Variance of FLUX_W1 |
FLUX_IVAR_W2 |
float32 |
nanomaggy^-2 |
Inverse Variance of FLUX_W2 |
FIBERFLUX_G |
float32 |
nanomaggy |
Predicted g-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing |
FIBERFLUX_R |
float32 |
nanomaggy |
Predicted r-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing |
FIBERFLUX_Z |
float32 |
nanomaggy |
Predicted z-band flux within a fiber of diameter 1.5 arcsec from this object in 1 arcsec Gaussian seeing |
FIBERTOTFLUX_G |
float32 |
nanomaggy |
Predicted g-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing |
FIBERTOTFLUX_R |
float32 |
nanomaggy |
Predicted r-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing |
FIBERTOTFLUX_Z |
float32 |
nanomaggy |
Predicted z-band flux within a fiber of diameter 1.5 arcsec from all sources at this location in 1 arcsec Gaussian seeing |
MASKBITS |
int16 |
Bitwise mask indicating that an object touches a pixel in the |
|
SERSIC |
float32 |
Power-law index for the Sersic profile model ( |
|
SHAPE_R |
float32 |
arcsec |
Half-light radius of galaxy model for galaxy type |
SHAPE_E1 |
float32 |
Ellipticity component 1 of galaxy model for galaxy type |
|
SHAPE_E2 |
float32 |
Ellipticity component 2 of galaxy model for galaxy type |
|
REF_ID |
int64 |
Tyc1*1,000,000+Tyc2*10+Tyc3 for Tycho-2; “sourceid” for Gaia DR2 |
|
REF_CAT |
char[2] |
Reference catalog source for this star: “T2” for Tycho-2, “G2” for Gaia DR2, “L3” for the SGA, empty otherwise |
|
GAIA_PHOT_G_MEAN_MAG |
float32 |
mag |
Gaia G band magnitude |
GAIA_PHOT_BP_MEAN_MAG |
float32 |
mag |
Gaia BP band magnitude |
GAIA_PHOT_RP_MEAN_MAG |
float32 |
mag |
Gaia RP band magnitude |
PARALLAX |
float32 |
mas |
Reference catalog parallax |
PHOTSYS |
char[1] |
‘N’ for the MzLS/BASS photometric system, ‘S’ for DECaLS |