Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample

Citation:

Strauss MA, Weinberg DH, Lupton RH, Narayanan VK, Annis J, Bernardi M, Blanton M, Burles S, Connolly AJ, Dalcanton J, et al. Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample. The Astronomical Journal. 2002;124 :1810-1824.

Date Published:

September 1, 200

Abstract:

We describe the algorithm that selects the main sample of galaxies forspectroscopy in the Sloan Digital Sky Survey (SDSS) from the photometricdata obtained by the imaging survey. Galaxy photometric properties aremeasured using the Petrosian magnitude system, which measures flux inapertures determined by the shape of the surface brightness profile. Themetric aperture used is essentially independent of cosmological surfacebrightness dimming, foreground extinction, sky brightness, and thegalaxy central surface brightness. The main galaxy sample consists ofgalaxies with r-band Petrosian magnitudes r<=17.77 and r-bandPetrosian half-light surface brightnesses μ50<=24.5 magarcsec-2. These cuts select about 90 galaxy targets persquare degree, with a median redshift of 0.104. We carry out a number oftests to show that (1) our star-galaxy separation criterion is effectiveat eliminating nearly all stellar contamination while removing almost nogenuine galaxies, (2) the fraction of galaxies eliminated by our surface

Notes:

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