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We discuss physical properties and baryonic content of broad Ly alphaabsorbers (BLAs) at low redshift. These absorption systems, recently discoveredin high-resolution, high-signal to noise quasar absorption line spectra,possibly trace the warm-hot intergalactic medium (WHIM) in the temperaturerange between 10^5 and 10^6 K. To extend previous BLA measurements we haveanalyzed STIS data of the two quasars H 1821+643 and PG 0953+415 and haveidentified 13 BLA candidates along a total (unblocked) redshift path ofdz=0.440. Combining our measurements with previous results for the lines ofsight toward PG 1259+593 and PG 1116+215, the resulting new BLA sample consistsof 20 reliably detected systems as well as 29 additional tentative cases,implying a BLA number density of dN/dz=22-53. We estimate that the contributionof BLAs to the baryon density at z=0 is Omega_b(BLA)>0.0027 h_70^-1 forabsorbers with log (N/b)>11.3. This number indicates that WHIM broad Ly alphaabsorbers contain a substantial fraction of the baryons in the local Universe.(Abridged abstract)Comment: 17 pages, 7 figures; Accepted for publication in A&

Tracing baryons in the warm-hot intergalactic medium with broad Ly α absorption