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Constraints on Primordial Non-Gaussianity from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>800</mml:mn><mml:mtext> </mml:mtext><mml:mn>000</mml:mn></mml:mrow></mml:math>Photometric Quasars
We derive robust constraints on primordial non-Gaussianity (PNG) using the clustering of 800,000 photometric quasars from the Sloan Digital Sky Survey in the redshift range $0.5<z<3.5$. These measurements rely on the novel technique of {\it extended mode projection} to control the impact of spatially-varying systematics in a robust fashion, making …