GALEX-SDSS photometric redshifts: Table description

NOTE: for 'completeness', we provide the results from the two methods used, LePhare and Polyfit. The results obtained with Polyfit are better, so we advise to use them. Note however that, strictly speaking, the photometric redshifts from Polyfit are only valid in the same range than the training set (z< 0.25).

The following table describes each of the columns contained in the database. It is divided in 4 parts:

IDs information: GALEX identifiers, and identifier of the SDSS cross-match object used
Results from LePhare alone (*_best_* columns and next ones)
Results using Polyfit result as input for LePhare (*_polyfit_* columns)
Results using spectroscopic redshifts as input for LePhare (*_spec_* columns)

Column name	Description
objid	unique GALEX identifier
photoextractid	pointer to PhotoExtract
sdssobjid	SDSS object cross-match identifier
z_best	photometric redshift from LePhare
z_best68_low	Lower error at 68%
z_best68_high	Upper error at 68%
chi_best	chi² value for best fit
mod_best	best fitting model number
z_sec	second best redshift estimation
chi_sec	chi² value for second best estimation
mod_sec	best fitting model number for second best estimation
z_qso	photometric redshift using qso template fitting
chi_qso	chi² value for best fit using qso template
mod_qso	best fitting qso model number
mod_star	best fitting star model number
chi_star	chi² value for best fit using star template
k_cor_fuv	fuv kcorrection
k_cor_nuv	nuv kcorrection
k_cor_u	u kcorrection
k_cor_g	g kcorrection
k_cor_r	r kcorrection
k_cor_i	i kcorrection
k_cor_z	z kcorrection
mag_abs_fuv	fuv absolute magnitude
mag_abs_nuv	nuv absolute magnitude
mag_abs_u	u absolute magnitude
mag_abs_g	g absolute magnitude
mag_abs_r	r absolute magnitude
mag_abs_i	i absolute magnitude
mag_abs_z	z absolute magnitude
k_cor_qso_fuv	fuv kcorrection using qso template
k_cor_qso_nuv	nuv kcorrection using qso template
k_cor_qso_u	u kcorrection using qso template
k_cor_qso_g	g kcorrection using qso template
k_cor_qso_r	r kcorrection using qso template
k_cor_qso_i	i kcorrection using qso template
k_cor_qso_z	z kcorrection using qso template
mag_abs_qso_fuv	fuv absolute magnitude using qso template
mag_abs_qso_nuv	nuv absolute magnitude using qso template
mag_abs_qso_u	u absolute magnitude using qso template
mag_abs_qso_g	g absolute magnitude using qso template
mag_abs_qso_r	r absolute magnitude using qso template
mag_abs_qso_i	i absolute magnitude using qso template
mag_abs_qso_z	z absolute magnitude using qso template
z_polyfit	photometric redshift from polyfit
chi_polyfit	chi2 value for best fit
mod_polyfit	best fitting model number (only galaxy templates)
k_cor_polyfit_fuv	fuv kcorrection
k_cor_polyfit_nuv	nuv kcorrection
k_cor_polyfit_u	u kcorrection
k_cor_polyfit_g	g kcorrection
k_cor_polyfit_r	r kcorrection
k_cor_polyfit_i	i kcorrection
k_cor_polyfit_z	z kcorrection
mag_abs_polyfit_fuv	fuv absolute magnitude
mag_abs_polyfit_nuv	nuv absolute magnitude
mag_abs_polyfit_u	u absolute magnitude
mag_abs_polyfit_g	g absolute magnitude
mag_abs_polyfit_r	r absolute magnitude
mag_abs_polyfit_i	i absolute magnitude
mag_abs_polyfit_z	z absolute magnitude
z_best_spec	spectroscopic redshift
chi_spec	chi² value for best fit
mod_spec	best fitting model number
k_cor_spec_fuv	fuv kcorrection
k_cor_spec_nuv	nuv kcorrection
k_cor_spec_u	u kcorrection
k_cor_spec_g	g kcorrection
k_cor_spec_r	r kcorrection
k_cor_spec_i	i kcorrection
k_cor_spec_z	z kcorrection
mag_abs_spec_fuv	fuv absolute magnitude
mag_abs_spec_nuv	nuv absolute magnitude
mag_abs_spec_u	u absolute magnitude
mag_abs_spec_g	g absolute magnitude
mag_abs_spec_r	r absolute magnitude
mag_abs_spec_i	i absolute magnitude
mag_abs_spec_z	z absolute magnitude