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Can someone provide a table of redshifts and distances for at least 30 galaxies within 1 billion light-years?

I'm testing a local flow model and need a clean, heterogeneous sample of galaxies with both redshift and independently measured distances (not Hubble-law estimates). I'm wary of just pulling from a single catalog due to systematic errors. Can you point me to the most robust compiled resource and highlight the key caveats regarding different distance measurement methods?

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By Shreya K Answered 2 years ago

For a robust sample, I would recommend starting with the Cosmicflows compilations by Tully et al. They meticulously homogenize distances from several methods (TF, FP, SBF, Cepheids, SNe Ia). Alternatively, you can build your own sample from the NASA/IPAC Extragalactic Database (NED), which aggregates values from the literature. The major caveat is to avoid mixing methods carelessly. For instance, Tully-Fisher distances for spirals and Fundamental Plane distances for ellipticals have different zero-point systematics. I have seen projects get skewed results by not accounting for this. Always note the method for each galaxy and consider applying a cross-calibrated correction.

 

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