We present the first attempt at measuring the baryonic acoustic oscillations ( BAO ) in the large scale cross-correlation between the magnesium-II doublet ( MgII ) flux transmission field and the position of quasar and galaxy tracers .
The MgII flux transmission continuous field at 0.3 < z < 1.6 is measured from \num 500589 quasar spectra obtained in the Baryonic Oscillation Spectroscopic Survey ( BOSS ) and the extended BOSS ( eBOSS ) .
The position of \num 246697 quasar tracers and \num 1346776 galaxy tracers are extracted from the Sloan Digital Sky Survey ( SDSS ) I , II , BOSS and eBOSS catalogs .
In addition to measuring the cosmological BAO scale and the biased matter density correlation , this study allows tests and improvements to cosmological Lyman- \alpha analyses .
A feature consistent with that of the BAO is detected at a significance of \Delta \chi ^ { 2 } = 7.25 .
The measured MgII linear transmission bias parameters are b _ { \mathrm { MgII ( 2796 ) } } ( z = 0.59 ) = ( -6.82 \pm 0.54 ) \times 10 ^ { -4 } and b _ { \mathrm { MgII ( 2804 ) } } ( z = 0.59 ) = ( -5.55 \pm 0.46 ) \times 10 ^ { -4 } , and the MgI bias is b _ { \mathrm { MgI ( 2853 ) } } ( z = 0.59 ) = ( -1.48 \pm 0.24 ) \times 10 ^ { -4 } .
Their redshift evolution is characterized by the power-law index : \gamma _ { \mathrm { Mg } } = 3.36 \pm 0.46 .
These measurements open a new window towards using BAO from flux transmission at z < 1 in the final eBOSS sample and in the upcoming sample from the Dark Energy Spectroscopic Instrument .