[ITAL]Far Ultraviolet Spectroscopic Explorer[/ITAL] Observations of the Galactic and Intergalactic Medium toward H1821+643

摘要: We have obtained moderate-resolution spectra of the bright QSO H1821+643 (z = 0.297) in wavelength interval 990-1185 A with Far Ultraviolet Spectroscopic Explorer (FUSE). Strong, complex O VI λ1032 and Fe II λ1145 absorption arising gas above several spiral arms outer warp our Galaxy is detected. identified by a high negative-velocity (-215 km s-1) component VI, which corresponds to limiting velocity vLSR ~ -190 ± 20 s-1 for Milky Way along this line sight, assuming corotation disk halo flat rotation curve Galaxy. report detection four absorbers intergalactic medium, through detections Lyβ at z 0.02438 0.1213, Lyδ, Ly, Lyζ system 0.2249, C III λ977 0.1705, 0.12137. The FUSE data show that Lyman 0.225 are composed two components separated ~70 s-1. Finally, we observed associated from λ832, IV λ787, possibly S V λ786 redshift 0.297). Ne VIII λλ770, 780 not detected system. When combined previous λ1032, conclude multiphase absorber, discuss origin context.