We report the constraints of H _ { 0 } obtained from Wilkinson Microwave Anisotropy Probe ( WMAP ) combined with the latest baryonic acoustic oscillations ( BAO ) measurements .
We use the BAO measurements from the 6dF Galaxy Survey ( 6dFGS ) , the SDSS DR7 main galaxies sample ( MGS ) , the BOSS DR12 galaxies and the eBOSS DR14 quasars .
Adding the recent BAO measurements to the cosmic microwave background ( CMB ) data from WMAP , we constrain cosmological parameters \Omega _ { m } = 0.298 \pm 0.005 , H _ { 0 } = 68.36 ^ { +0.53 } _ { -0.52 } km s ^ { -1 } Mpc ^ { -1 } , \sigma _ { 8 } = 0.8170 ^ { +0.0159 } _ { -0.0175 } in a spatially flat \Lambda cold dark matter ( \Lambda CDM ) model , and \Omega _ { m } = 0.302 \pm 0.008 , H _ { 0 } = 67.63 \pm 1.30 km s ^ { -1 } Mpc ^ { -1 } , \sigma _ { 8 } = 0.7988 ^ { +0.0345 } _ { -0.0338 } in a spatially flat w CDM model , respectively .
The combined constraint on w from CMB and BAO in a spatially flat w CDM model is w = -0.96 \pm 0.07 .
Our measured H _ { 0 } results prefer a value lower than 70 km s ^ { -1 } Mpc ^ { -1 } , consistent with the recent data on CMB constraints from Planck ( 2018 ) , but in 3.1 \sim 3.5 \sigma tension with local measurements of Riess et al .
( 2018 ) in \Lambda CDM and w CDM framework , respectively .
Compared with the WMAP alone analysis , the WMPA+BAO analysis reduces the error bar by 75.4 % in \Lambda CDM model and 95.3 % in w CDM model .