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Table: ls_dr7.bricks_dr7
(The bold columns are indexed columns)
Column NameDescriptionDatatype
bricknameName of brick, encoding the brick sky position, e.g. 1126p222 near RA=112.6, Dec=+22.2VARCHAR(n)
decDeclination at epoch J2000DOUBLE
ebvGalactic extinction (E(B-V)) reddening from SFD98, used to compute DECAM_MW_TRANSMISSION and WISE_MW_TRANSMISSIONREAL
elatEcliptic LatitudeDOUBLE
elonEcliptic LongitudeDOUBLE
ext_gExtinction in g-bandREAL
ext_rExtinction in r-bandREAL
ext_w1Extinction in W1REAL
ext_w2Extinction in W1REAL
ext_w3Extinction in W1REAL
ext_w4Extinction in W1REAL
ext_zExtinction in z-bandREAL
galdepth_gAs for PSFDEPTH_G but for a galaxy (0.45 arcsec exp, round) detection sensitivityREAL
galdepth_rAs for PSFDEPTH_R but for a galaxy (0.45 arcsec exp, round) detection sensitivityREAL
galdepth_zAs for PSFDEPTH_Z but for a galaxy (0.45 arcsec exp, round) detection sensitivityREAL
glatGalactic LatitudeDOUBLE
glonGalactic LongitudeDOUBLE
htm9HTM index (order 9 => ~10 arcmin size)INTEGER
ncompTotal number of BRICK_UNIQUE objects in this brick of COMP typesSMALLINT
ndevTotal number of BRICK_UNIQUE objects in this brick of DEV typesSMALLINT
nest4096HEALPIX index (Nsides 4096, Nest scheme => ~52 arcsec sizeINTEGER
nexpTotal number of BRICK_UNIQUE objects in this brick of EXP typesSMALLINT
nexp_gMedian number of exposures in the unique are (i.e. BRICK_PRIMARY area) of the brick in the g-bandSMALLINT
nexp_rMedian number of exposures in the unique are (i.e. BRICK_PRIMARY area) of the brick in the r-bandSMALLINT
nexp_zMedian number of exposures in the unique are (i.e. BRICK_PRIMARY area) of the brick in the z-bandSMALLINT
nexphist_g_1Histogram of number of pixels in the unique brick area with 0,1,2,3,4 or 5 exposures in gINTEGER
nexphist_g_2INTEGER
nexphist_g_3INTEGER
nexphist_g_4INTEGER
nexphist_g_5INTEGER
nexphist_g_6INTEGER
nexphist_r_1Histogram of number of pixels in the unique brick area with 0,1,2,3,4 or 5 exposures in rINTEGER
nexphist_r_2INTEGER
nexphist_r_3INTEGER
nexphist_r_4INTEGER
nexphist_r_5INTEGER
nexphist_r_6INTEGER
nexphist_z_1Histogram of number of pixels in the unique brick area with 0,1,2,3,4 or 5 exposures in zINTEGER
nexphist_z_2INTEGER
nexphist_z_3INTEGER
nexphist_z_4INTEGER
nexphist_z_5INTEGER
nexphist_z_6INTEGER
nobjsTotal number of BRICK_UNIQUE objects in this brick of all typesSMALLINT
npsfTotal number of BRICK_UNIQUE objects in this brick of PSF typesSMALLINT
nrexTotal number of BRICK_UNIQUE objects in this brick, of type REXSMALLINT
nsimpTotal number of BRICK_UNIQUE objects in this brick of SIMP typesSMALLINT
psfdepth_gFor a (5sigma) point source detection limit in (g), (5/sqrt(mathrm{PSFDEPTH_G})) gives flux in nanomaggies and (-2.5[log_{10}(5 / sqrt(mathrm{PSFDEPTH_G})) - 9]) gives corresponding magnitudeREAL
psfdepth_rFor a (5sigma) point source detection limit in (g), (5/sqrt(mathrm{PSFDEPTH_R})) gives flux in nanomaggies and (-2.5[log_{10}(5 / sqrt(mathrm{PSFDEPTH_R})) - 9]) gives corresponding magnitudeREAL
psfdepth_zFor a (5sigma) point source detection limit in (g), (5/sqrt(mathrm{PSFDEPTH_Z})) gives flux in nanomaggies and (-2.5[log_{10}(5 / sqrt(mathrm{PSFDEPTH_Z})) - 9]) gives corresponding magnitudeREAL
psfsize_gWeighted average PSF FWHM in the (g) bandREAL
psfsize_rWeighted average PSF FWHM in the (r) bandREAL
psfsize_zWeighted average PSF FWHM in the (z) bandREAL
raRight ascension at epoch J2000DOUBLE
ring256HEALPIX index (Nsides 256, Ring scheme => ~14 arcmin size)INTEGER
trans_gMedian Milky Way dust transparency in g-band, based on ebv. See also DECAM_MW_TRANSMISSIONREAL
trans_rMedian Milky Way dust transparency in r-band, based on ebv. See also DECAM_MW_TRANSMISSIONREAL
trans_wise_1Median Milky Way dust transparency in WISE bands, based on ebv. See also, e.g., MW_TRANSMISSION_W1REAL
trans_wise_2Median Milky Way dust transparency in WISE bands, based on ebv. See also, e.g., MW_TRANSMISSION_W1REAL
trans_wise_3Median Milky Way dust transparency in WISE bands, based on ebv. See also, e.g., MW_TRANSMISSION_W1REAL
trans_wise_4Median Milky Way dust transparency in WISE bands, based on ebv. See also, e.g., MW_TRANSMISSION_W1REAL
trans_zMedian Milky Way dust transparency in z-band, based on ebv. See also DECAM_MW_TRANSMISSIONREAL
wise_nobs_1Number of images that contributed to WISE calculations in each filter (not profile-weighted)SMALLINT
wise_nobs_2Number of images that contributed to WISE calculations in each filter (not profile-weighted)SMALLINT
wise_nobs_3Number of images that contributed to WISE calculations in each filter (not profile-weighted)SMALLINT
wise_nobs_4Number of images that contributed to WISE calculations in each filter (not profile-weighted)SMALLINT