Constraining primordial non-Gaussianity with high-redshift probes
- Scuola Internazionale Superiore di Studi Avanzati, Via Bonomea 265, I-34136 Trieste (Italy)
- INAF-Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova (Italy)
- Dipartimento di Fisica ''G. Galilei'', Università di Padova, Via Marzolo 8, I-35131 Padova (Italy)
- ICREA (Institució Catalana de Recerca i Estudis Avançats) and Instituto de Ciencias del Cosmos, (ICC-UB-IEEC) Universidad de Barcelona, Marti i Franques 1, 08028, Barcelona (Spain)
- INAF-Osservatorio Astronomico di Trieste, Via G.B. Tiepolo 11, I-34131 Trieste (Italy)
We present an analysis of the constraints on the amplitude of primordial non-Gaussianity of local type described by the dimensionless parameter f{sub NL}. These constraints are set by the auto-correlation functions (ACFs) of two large scale structure probes, the radio sources from NRAO VLA Sky Survey (NVSS) and the QSO catalogue of Sloan Digital Sky Survey Release Six (SDSS DR6 QSOs), as well as by their cross-correlation functions (CCFs) with the cosmic microwave background (CMB) temperature map (Integrated Sachs-Wolfe effect). Several systematic effects that may affect the observational estimates of the ACFs and of the CCFs are investigated and conservatively accounted for. Our approach exploits the large-scale scale-dependence of the non-Gaussian halo bias. The derived constraints on (f{sub NL}) coming from the NVSS CCF and from the QSO ACF and CCF are weaker than those previously obtained from the NVSS ACF, but still consistent with them. Finally, we obtain the constraints on f{sub NL} = 53±25 (1 σ) and f{sub NL} = 58±24 (1 σ) from NVSS data and SDSS DR6 QSO data, respectively.
- OSTI ID:
- 22272809
- Journal Information:
- Journal of Cosmology and Astroparticle Physics, Vol. 2010, Issue 08; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1475-7516
- Country of Publication:
- United States
- Language:
- English
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