SOMs of spectra from the Sloan Digital Sky Survey (SDSS)

SDSS Data Release 12

Galaxies and QSOs

• 1.6 million spectra of galaxies and QSOs

QSOs clustered in redshift bins

• 0.7 million QSO spectra binned in 360 redshift intervals

Stripe 82

• 0.25 million spectra with median S/N > 3
• 23 000 spectra of QSOs
• 6 000 spectra of QSOs and galaxies with subclassifications AGN, BROADLINE, AGN_BROADLINE, QSO

Special selections of stars

• sample 1
• sample 2
• sample 3

SDSS Data Release 7

• about 1 million spectra of stars, galaxies, QSOs and unknowns