Probing Large-scale UV Background Inhomogeneity Associated with Quasars using Metal Absorption

We study large-scale UV background inhomogeneity in three-dimensions associated with the observed quasar populations at high redshift. We do this by measuring metal absorption through quasar absorption spectrum stacking as a function distance to closest quasar in SDSS-IV/eBOSS on 10s of comoving megaparsec scales. We study both intergalactic medium absorbers and mixed circumgalactic medium absorbers and probe absorption in O VI, C IV, and Si IV, and Si III. Overall stronger high ionization species absorption is seen closer to quasars at $2.4

Keywords:

• Absorption spectroscopy
• Flux
• Astrophysics
• Stacking
• Quasar
• Ionization
• Redshift
• Absorption (pharmacology)
• Homogeneity (statistics)
• Physics

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