We present two low-resolution (R ∼ 1300) high signal-to-noise ratio spectra (Wr,lim ≈ 50 mÅ) of the quasar CSO 118 (zem = 2.97) taken with the Hobby-Eberly Telescope Marcario Low-Resolution Spectrograph. We detect eight absorbers selected by the C IV λλ1548, 1550 absorption doublet in the redshift range 2.23 ≲ zabs ≲ 2.97, seven of which are zabs ≳ 2.68. In the redshift range covered by the seven zabs ≳ 2.68 systems, one expects to find two absorbers. We discuss possible explanations for such an excess of absorbers in a small velocity range. Only superclustering at high redshift and absorption due to intrinsic gas are feasibly allowed.
All Science Journal Classification (ASJC) codes
- Astronomy and Astrophysics
- Space and Planetary Science