Galaxy And Mass Assembly (GAMA): the input catalogue and star–galaxy separation

We describe the spectroscopic target selection for the Galaxy And Mass Assembly (GAMA) survey. The input catalogue is drawn from the Sloan Digital Sky Survey (SDSS) and UKIRT Infrared Deep Sky Survey (UKIDSS). The initial aim is to measure redshifts for galaxies in three 4 ◦ × 12 ◦ regions at 9, 12 and 14.5 h, on the celestial equator, with magnitude selections r< 19.4, z< 18.2 and K AB < 17.6 over all three regions, and r< 19.8 in the 12-h region. The target density is 1080 deg −2 in the 12-h region and 720 deg −2 in the other regions. The average GAMA target density and area are compared with completed and ongoing galaxy redshift surveys. The GAMA survey implements a highly complete star–galaxy separation that jointly uses an intensity-profile separator (� sg = r psf − r model as per the SDSS) and a

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