Bibcode
Comparat, J.; Chuang, C.-H.; Rodríguez-Torres, S.; Pellejero-Ibanez, M.; Prada, F.; Yepes, G.; Courtois, H. M.; Zhao, G.-B.; Wang, Y.; Sanchez, J.; Maraston, C.; Metcalf, R. Benton; Peiro-Perez, J.; Kitaura, F. S.; Pérez, E.; González Delgado, R. M.
Bibliographical reference
Monthly Notices of the Royal Astronomical Society, Volume 458, Issue 3, p.2940-2952
Advertised on:
5
2016
Citations
6
Refereed citations
4
Description
The Baryon Acoustic Oscillation (BAO) feature in the power spectrum of
galaxies provides a standard ruler to measure the accelerated expansion
of the Universe. To extract all available information about dark energy,
it is necessary to measure a standard ruler in the local, z < 0.2,
universe where dark energy dominates most the energy density of the
Universe. Though the volume available in the local universe is limited,
it is just big enough to measure accurately the long 100 h-1
Mpc wave-mode of the BAO. Using cosmological N-body simulations and
approximate methods based on Lagrangian perturbation theory, we
construct a suite of a thousand light-cones to evaluate the precision at
which one can measure the BAO standard ruler in the local universe. We
find that using the most massive galaxies on the full sky (34 000
deg2), i.e. a K2MASS < 14 magnitude-limited
sample, one can measure the BAO scale up to a precision of 4 per cent
(˜1.2 per cent using reconstruction). We also find that such a
survey would help to detect the dynamics of dark energy. Therefore, we
propose a 3-year long observational project, named the Low Redshift
survey at Calar Alto, to observe spectroscopically about 200 000
galaxies in the northern sky to contribute to the construction of
aforementioned galaxy sample. The suite of light-cones is made available
to the public.