First-year Sloan Digital Sky Survey-II supernova results: consistency and constraints with other intermediate-redshift data sets

Abstract

We present an analysis of the luminosity distances of Type Ia Supernovae (SNe) from the Sloan Digital Sky Survey-II (SDSS-II) SN Survey in conjunction with other intermediateredshift (z < 0.4) cosmological measurements including redshift-space distortions from the Two-Degree Field Galaxy Redshift Survey (2dFGRS), the integrated Sachs-Wolfe (ISW) effect seen by the SDSS and the latest baryon acoustic oscillation (BAO) distance scale from both the SDSS and 2dFGRS. We have analysed the SDSS-II SN data alone using a variety of 'model-independent' methods and find evidence for an accelerating Universe at a >97 per cent level from this single data set. We find good agreement between the SN and