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Tracing the cosmic velocity field at z ~ 0.1 from galaxy luminosities in the SDSS DR7
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Tracing the cosmic velocity field at z ~ 0.1 from galaxy luminosities in the SDSS DR7
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Tracing the cosmic velocity field at z ~ 0.1 from galaxy luminosities in the SDSS DR7
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Paper
Tracing the cosmic velocity field at z ~ 0.1 from galaxy luminosities in the SDSS DR7
2014
Overview
Spatial modulations in the distribution of observed luminosities (computed using redshifts) of ~ 5 \\(\\times\\) 10\\(^5\\) galaxies from the SDSS Data Release 7, probe the cosmic peculiar velocity field out to z ~ 0.1. Allowing for luminosity evolution, the r-band luminosity function, determined via a spline-based estimator, is well represented by a Schechter form with M\\(^{\\star}\\)(z) - 5log\\(_{10}\\)h = -20.52 - 1.6(z - 0.1) \\(\\pm\\) 0.05 and \\(\\alpha^{\\star}\\) = -1.1 \\(\\pm\\) 0.03. Bulk flows and higher velocity moments in two redshift bins, 0.02 < z < 0.07 and 0.07 < z < 0.22, agree with the predictions of the \\(\\Lambda\\)CDM model, as obtained from mock galaxy catalogs designed to match the observations. Assuming a \\(\\Lambda\\)CDM model, we estimate \\(\\sigma_{8}\\) \\(\\approx\\) 1.1 \\(\\pm\\) 0.4 for the amplitude of the linear matter power spectrum, where the low accuracy is due to the limited number of galaxies. While the low-z bin is robust against coherent photometric uncertainties, the bias of results from the second bin is consistent with the ~ 1% magnitude tilt reported by the SDSS collaboration. The systematics are expected to have a significantly lower impact in future datasets with larger sky coverage and better photometric calibration.
Publisher
Cornell University Library, arXiv.org
Subject
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