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Published August 1, 2017 | Version v1
Poster Open

Probing the Circumgalactic Gas Around high redshift galaxies with VUDS

  • 1. Instituto de Física y Astronomía, Universidad de Valparaíso

Description

We probe the CGM of high redshift galaxies belonging to VIMOS Ultra Deep Survey.  We used deep spectroscopy of different lines-of-sight around foreground galaxies to get useful information on the overall kinematics, chemical abundances, and (in some cases) estimates of the mass flux of cool material entrained in an in-outflow.We have selected a sample of 1244 close (0~150 kpc) galaxy pairs from the Vimos Ultra-Deep Survey (VUDS) to probe the circumgalactic medium (CGM) around galaxies at 2< z <4 .  We selected close galaxy pairs, and identified in the spectra of background bright galaxies the faint imprints left by the circumgalactic gas surrounding the foreground galaxies by using stacking analysis which provide a powerful way to extract faint signal from absorptions lines data sets, and enabling measurements of these weak absorptions.  We are able to trace the average absorptions line strengths (i.e. Lyα, OISiII, CIV, OISiII, CIV, AlII) out to galactocentric radii of ∼150 kpc on stacked spectra, and found that the CGM of galaxies at 2< z <5 are rich in metals even at ∼150 kpc away from the galaxies.

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Mendez-Hernandez17-Poster.pdf

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