# Imprints of the first billion years: Lyman limit systems at $z \sim 5$

23 Oct 2018 Crighton Neil H. M. 4 and 5 Prochaska J. Xavier 4 and 5 Murphy Michael T. 4 and 5 O'Meara John M. 4 and 5 Worseck Gabor 4 and 5 Smith Britton D.

Lyman Limit systems (LLSs) trace the low-density circumgalactic medium and the most dense regions of the intergalactic medium, so their number density and evolution at high redshift, just after reionisation, are important to constrain. We present a survey for LLSs at high redshifts, $z_{\rm LLS} =3.5$--5.4, in the homogeneous dataset of 153 optical quasar spectra at $z \sim 5$ from the Giant Gemini GMOS survey... (read more)

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# Categories

• ASTROPHYSICS OF GALAXIES
• COSMOLOGY AND NONGALACTIC ASTROPHYSICS