Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21720402g&link_type=abstract
American Astronomical Society, AAS Meeting #217, #204.02; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Recent publications claim that there is no convincing evidence for measurements of the baryonic acoustic (BAO) feature in galaxy samples using either monopole or radial information. Different claims seem contradicting: data is either not consistent with the BAO model or data is consistent with both the BAO model and featureless models without BAO. We investigate this point with a set of 216 mock realistic galaxy catalogs extracted from MICEL7680, one of the largest volume dark matter simulation run to date. Mocks cover similar volume, densities and bias as the real galaxies and provide 216 realizations of the Lambda Cold Dark Matter (LCDM) BAO model. We find that only 20\% of the mocks show a statistically significant (3 sigma) preference for the true (input) LCDM BAO model as compared to a featureless (non-physical) model without BAO. This indicates that the volume of current galaxy samples is not yet large enough to differentiate between these two different classes of models. Does this mean that we can not measure the BAO position in the mocks? Using a simple (non optimal) algorithm we show that in 50\% (100\%) of the mocks we can find the BAO position within 5\% (20\%) of the true value. These two findings are not in contradiction. The former is about model selection, the later is about parameter fitting within a given model. We conclude that current monopole and radial BAO measurements can indeed be used as standard ruler, as long as one assumes the LCDM class of models, or models which produce similar 2-point correlations (and errors) to the ones in LCDM.
Cabre Anna
Gaztanaga Enrique
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