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---------------------------------- SDSS data ---------------------------------
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SDSS galaxies from the contiguous northern footprint regions which have a completeness of >90%. The data set contains 497536 galaxies with ugriz magnitudes, stellar masses and SSFRs.

Details can be found here https://ui.adsabs.harvard.edu/abs/2022arXiv220800540D/abstract

------------------------------ Reading the files -----------------------------

Datasets can be read from the file in Python by doing, e.g.

# read in ra, dec, z and absolute r-band magnitude
import pandas as pd
f = pd.read_hdf('sdss_safe0_northonly_fgotmin_0p9.hdf5', key='Data')
ra = f["ra"]
dec = f["dec"]
z_obs = f["z_obs"]
M_r = f["M_r"]

-------------------------------- Random file --------------------------------

The random file contains 67x the number of galaxies.

-------------------------------- Footprint --------------------------------

The effective area of the contiguous northern footprint regions with completeness of >90% is 6511 sq deg

---------------------- Description of galaxy properties ----------------------

The following datasets are stored:

indx
ID of the galaxy

ra
right ascension (degrees)

dec
declination (degrees)

z
measured redshift, including fibre collisions

k_corr_u
u-band k-correction at reference redshift z = 0.1

k_corr_g
g-band k-correction at reference redshift z = 0.1

k_corr_r
r-band k-correction at reference redshift z = 0.1

k_corr_i
i-band k-correction at reference redshift z = 0.1

k_corr_z
z-band k-correction at reference redshift z = 0.1

M_u
rest-frame u-band absolute magnitude, k-corrected to z = 0.1, without the e-correction

M_g
rest-frame g-band absolute magnitude, k-corrected to z = 0.1, without the e-correction

M_r
rest-frame r-band absolute magnitude, k-corrected to z = 0.1, without the e-correction

M_i
rest-frame i-band absolute magnitude, k-corrected to z = 0.1, without the e-correction

M_z
rest-frame z-band absolute magnitude, k-corrected to z = 0.1, without the e-correction

m_u
apparent u-band magnitude

m_g
apparent g-band magnitude

m_r
apparent r-band magnitude

m_i
apparent i-band magnitude

m_z
apparent z-band magnitude

g_r
rest-frame g-r colour k-corrected to z = 0.1

g_r_obs
observer-frame g-r colour.

mass_MPA
MPA stellar mass (log(Msun/h^2))

mass_granada_best
granada best-fit stellar mass (log(Msun/h^2))

mass_granada_median
granada median stellar mass (log(Msun/h^2))

ssfr_MPA
MPA specific star formation rate (log(1/Gyr))

ssfr_granada_best
granada best-fit stellar mass (log10 (1/Gyr))

ssfr_granada_median
granada median stellar mass(log10 (1/Gyr))

idnn
for a fibre-collided galaxy, ID of the nearest neighbour, used to assign its redshift. -1 if the galaxy has its own spectroscopic redshift

fgotten
fibre-collision completeness in the region containing the galaxy