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

Abstract

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 500,589 quasar spectra obtained in the Baryonic Oscillation Spectroscopic Survey (BOSS) and the extended BOSS (eBOSS). The position of 246,697 quasar tracers and 1,346,776 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.

arXiv comment16 pages, 9 figures, matches the published version by ApJ

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