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The extended Baryon Oscillation Spectroscopic Survey: measuring the cross-correlation between the MgII flux transmission field and quasars and galaxies at z=0.59
Hélion du Mas des Bourboux, Kyle S. Dawson, Nicolás G. Busca, Michael Blomqvist, Victoria de Sainte Agathe, Christophe Balland, Julian E. Bautista, Julien Guy, Vikrant Kamble, Adam D. Myers, Ignasi Pérez-Ràfols, Matthew M. Pieri, James Rich, Donald P. Schneider, Anže Slosar
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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 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-α analyses. A feature consistent with that of the BAO is detected at a significance of Δχ² = 7.25. The measured MgII linear transmission bias parameters are b_(MgII(2796)) (z = 0.59) = (-6.82 ±0.54) ×10⁻⁴ and b_(MgII(2804)) (z = 0.59) = (-5.55 ±0.46) ×10⁻⁴, and the MgI bias is b_(MgI(2853)) (z = 0.59) = (-1.48 ±0.24) ×10⁻⁴. Their redshift evolution is characterized by the power-law index: γ_(Mg) = 3.36 ±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.
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