2001/05/04 by Rajib Ganguly, R. Ganguly, Jane C. Charlton +2 · 1 citation
Physics and Astronomy · #Absorption (acoustics) #Absorption spectroscopy #Astronomy #Astronomy and Astrophysical Research #Astrophysical Phenomena and Observations #Astrophysics #Galaxies: Formation, Evolution, Phenomena #Galaxy #Optics #Physics #Quasar #Redshift #Spectral line #Spectrograph #astro-ph
paper · pdf · doi:10.1086/320690
12 pages total, 2 tables, 2 figures, accepted for publication in ApJ Letters
arxiv created 2001/05/04 · openalex publication_date 2001/06/01 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/06
We present two low-resolution ( R ~ 1300) high signal-to-noise ratio spectra ( W r , lim ≈ 50 mÅ) of the quasar CSO 118 ( z em = 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 ≲ z abs ≲ 2.97, seven of which are z abs ≳ 2.68. In the redshift range covered by the seven z abs ≳ 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.