The Angular Power Spectrum from SDSS Galaxies at 0.2 < z < 0.6

Details The Angular Power Spectrum from SDSS Galaxies at 0.2 < z < 0.6 The Angular Power Spectrum from SDSS Galaxies at 0.2 < z < 0.6

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...20314503s&link_type=abstract

American Astronomical Society Meeting 203, #145.03; Bulletin of the American Astronomical Society, Vol. 36, p.589

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present a preliminary measurement of the luminous red galaxy (LRG) power spectrum between redshifts 0.2 and 0.6 in the Sloan Digital Sky Survey (SDSS). The SDSS has observed these luminous objects out to z=0.6 over 5500 deg2, and a recent recalibration of these data has reduced systematic errors in relative photometry to a level of 1 percent. This precision photometry combined with a prominent 4000A break in the LRG spectrum allows us to estimate photometric redshifts to an accuracy of 0.025 RMS. This allows us to divide the galaxies into distinct redshift slices from which we measure the angular power spectrum as a function of redshift.
Baryons affect the shape of the power spectrum roll-off on the largest (>100 Mpc) scales, and imprint ``wiggles" on smaller scales corresponding to acoustic oscillations. These features appear at specific physical scales; tracking their angular size as a function of redshift provides a direct measure of the recent evolution of the Universe. We examine the constraints provided by the LRG power spectrum in the latest SDSS data.

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