The clustering of galaxies in the completed SDSS-III Baryon Oscillation
  Spectroscopic Survey: tomographic BAO analysis of DR12 combined sample in
  Fourier space
  We perform a tomographic baryon acoustic oscillations (BAO) analysis using
the monopole, quadrupole and hexadecapole of the redshift-space galaxy power
spectrum measured from the pre-reconstructed combined galaxy sample of the
completed Sloan Digital Sky Survey (SDSS-III) Baryon Oscillation Spectroscopic
Survey (BOSS) Data Release (DR)12 covering the redshift range of $0.20<z<0.75$.
By allowing for overlap between neighbouring redshift slices, we successfully
obtained the isotropic and anisotropic BAO distance measurements within nine
redshift slices to a precision of $1.5\%-3.4\%$ for $D_V/r_d$, $1.8\% -4.2\%$
for $D_A/r_d$ and $3.7\% - 7.5\%$ for $H \ r_d$, depending on effective
redshifts. We provide our BAO measurement of $D_A/r_d$ and $H \ r_d$ with the
full covariance matrix, which can be used for cosmological implications. Our
measurements are consistent with those presented in \citet{Acacia}, in which
the BAO distances are measured at three effective redshifts. We constrain dark
energy parameters using our measurements, and find an improvement of the
Figure-of-Merit of dark energy in general due to the temporal BAO information
resolved. This paper is part of a set that analyses the final galaxy clustering
dataset from BOSS.
