Berg, Trystyn A. M.Trystyn A. M.BergEllison, Sara L.Sara L.EllisonSANCHEZ RAMIREZ, RUBENRUBENSANCHEZ RAMIREZLópez, SebastiánSebastiánLópezD'ODORICO, ValentinaValentinaD'ODORICOBecker, George D.George D.BeckerChristensen, LiseLiseChristensenCUPANI, GuidoGuidoCUPANIDenney, Kelly D.Kelly D.DenneyWorseck, GáborGáborWorseck2021-01-292021-01-2920190035-8711http://hdl.handle.net/20.500.12386/30110Sub-damped Lyman α systems (subDLAs; H I column densities of 19.0 ≤ logN(H I) < 20.3) are rarely included in the cosmic H I census performed at redshifts z<SUB>abs</SUB> ≳ 1.5, yet are expected to contribute significantly to the overall H I mass budget of the Universe. In this paper, we present a blindly selected sample of 155 subDLAs found along 100 quasar sightlines (with a redshift path-length ∆X = 475) in the XQ-100 legacy survey to investigate the contribution of subDLAs to the H I mass density of the Universe. The impact of X-Shooter's spectral resolution on Ly α absorber identification is evaluated, and found to be sufficient for reliably finding absorbers down to a column density of logN(H I) ≥ 18.9. We compared the implications of searching for subDLAs solely using H I absorption versus the use of metal lines to confirm the identification, and found that metal-selection techniques would have missed 75 subDLAs. Using a bootstrap Monte Carlo simulation, we computed the column density distribution function (f(N, X)) and the cosmological H I mass density (Ω _{H I) of subDLAs and compared with our previous work based on the XQ-100 damped Lyman α systems. We do not find any significant redshift evolution in f(N, X) or Ω _{H I for subDLAs. However, subDLAs contribute 10-20 per cent of the total Ω _{H I measured at redshifts 2 < z < 5, and thus have a small but significant contribution to the H I budget of the Universe.STAMPAenArticle10.1093/mnras/stz20122-s2.0-85082594154000485158400101http://arxiv.org/abs/1907.07703v1https://academic.oup.com/mnras/article/488/3/4356/55388222019MNRAS.488.4356BFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_8 Formation and evolution of galaxies