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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 from500,589 quasar spectra obtained in the Baryonic Oscillation SpectroscopicSurvey (BOSS) and the extended BOSS (eBOSS). The position of 246,697 quasartracers and 1,346,776 galaxy tracers are extracted from the Sloan Digital SkySurvey (SDSS) I, II, BOSS and eBOSS catalogs. In addition to measuring thecosmological BAO scale and the biased matter density correlation, this studyallows tests and improvements to cosmological Lyman-$\alpha$ analyses. Afeature consistent with that of the BAO is detected at a significance of$\Delta \chi^{2} = 7.25$. The measured MgII linear transmission bias parametersare $b_{\mathrm{MgII(2796)}} (z = 0.59) = (-6.82 \pm 0.54) \, \times 10^{-4}$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-lawindex: $\gamma_{\mathrm{Mg}} = 3.36 \pm 0.46$. These measurements open a newwindow towards using BAO from flux transmission at $z < 1$ in the final eBOSSsample and in the upcoming sample from the Dark Energy SpectroscopicInstrument.

astrophysical journal/the astrophysical journal

The extended Baryon Oscillation Spectroscopic Survey: measuring the  cross-correlation between the MgII flux transmission field and quasars and  galaxies at $z=0.59$