Max Tegmark's cosmology library: uzc

Figure 1: The CfA/SSRS UZC galaxy redshift survey

Please click here to download a 600K compressed version of the paper, including the figures above in color (unpack it with "gunzip"). Click here if you are interested in other research of mine. If you're interested, I'll be happy to put a text file here with the measured band powers and window functions - just send me an email if that would be useful to you.

The power spectrum of the CfA/SSRS UZC galaxy redshift survey


Nikhil Padmanabhan, Max Tegmark, Andrew Hamilton,


The combined CfA2/SSRS redshift catalog has recently been improved in a number of ways and made public. We compute the redshift-space power spectrum of this catalog using the regions at -2.5< delta < 50 north (8h < alpha < 17h) and south (20h < alpha < 3h, b < -13) of the Galactic plane, where it is 98% complete down to Zwicky magnitude 15.5 and contains 13,681 galaxies. Our analysis uses Heavens-Taylor mode expansion, Karhunen-Loeve data compression and the Fisher matrix technique to compute quadratic band power estimates. This allows an exact calculation of window functions, including the integral constraint, as well as the production of a power spectrum with uncorrelated error bars. Our results with this larger data set agree well those of previous studies. We analyze 101 Mpc/h and 130 Mpc/h volume-limited subsets as well as the full magnitude-limited sample, and our results are well fit by, e.g., Lambda-CDM models with sigma8 = 1.2, 1.4 and 1.4, respectively. We estimate the effect of extinction using the Schlegel, Finkbeiner and Davis dust map.

Reference info:

astro-ph/9911421, submitted to ApJ

Online references:

This paper makes heavy use of methods describe in more detail in Tegmark 1997 and Tegmark, Hamilton, Strauss, Vogeley & Szalay 1998.

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This page was last modified November 24, 1999.