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Measuring the clustering of photometric quasars through blind mitigation of systematics

Published online by Cambridge University Press:  01 July 2015

Boris Leistedt ,
Hiranya V. Peiris  and
Nina Roth
Boris Leistedt
Affiliation:
Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K.boris.leistedt.11@ucl.ac.uk, h.peiris@ucl.ac.uk, n.roth@ucl.ac.uk
Hiranya V. Peiris
Affiliation:
Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K.boris.leistedt.11@ucl.ac.uk, h.peiris@ucl.ac.uk, n.roth@ucl.ac.uk
Nina Roth
Affiliation:
Department of Physics and Astronomy, University College London, London WC1E 6BT, U.K.boris.leistedt.11@ucl.ac.uk, h.peiris@ucl.ac.uk, n.roth@ucl.ac.uk
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Abstract

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We present accurate measurements of the large-scale clustering of photometric quasars from the Sloan Digital Sky Survey. These results, detailed in Leistedt & Peiris (2014), rely on a novel technique to identify and treat systematics when measuring angular power spectra, using null-tests and analytical marginalisation. This approach can be used to maximise the extraction of information from current and future galaxy or quasar surveys. For example, it enables to robustly constrain primordial non-Gaussianity (PNG), which modifies the bias of galaxies and quasars on large scales – the most sensitive to observational systematics. The constraints on PNG obtained with the quasar power spectra are detailed in Leistedt, Peiris & Roth (2014); these are the most stringent constraints to date obtained with a single tracer of the large-scale structure.

Keywords

quasars: generalcosmology: large-scale structure of universeearly universe
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S306: Statistical Challenges in 21st Century Cosmology , May 2014 , pp. 243 - 246
Copyright
Copyright © International Astronomical Union 2015 

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