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We present an analysis of the Ly α  forest towards 3C 273 from the Space Telescope Imaging Spectrograph at  ∼ 7 km s  −1   resolution, along with reprocessed data from the  Far Ultraviolet Spectroscopic Explorer . The high ultraviolet flux of 3C 273 allows us to probe the weak, low‐  z   absorbers. The main sample consists of 21 H  i  absorbers that we could discriminate to a sensitivity of . The redshift density for absorbers with  is  ∼ 1.5σ  below the mean for other lines of sight; for , it is consistent with numerical model predictions. The Doppler parameter distribution is consistent with other low‐  z   samples. We find no evidence for a break in the column density power‐law distribution to . A broad Ly α  absorber is within  Δ v ≤ 50  km s  −1   and 1.3 local‐frame Mpc of two  ∼ 0.5 L *  galaxies, with an O  vi  absorber  ∼ 700 km s  −1   away, similarly close to three galaxies and indicating overdense environments. We detect clustering on the  Δ v  &lt; 1000  km s  −1   scale at  3.4σ  significance for , consistent with the level predicted from hydrodynamical simulations, and indication for a Ly α  forest void at  0.09 &lt;  z  &lt; 0.12 . We find at least two components for the   z = 0.0053  Virgo absorber, but the total  column is not significantly changed.

The low‐redshift Lyα forest towards 3C 273 ★