We report on the detection of Ne viii in an intervening multiphase absorption line system at z = 0.32566 in the FUSE spectrum of the quasar 3C 263 (zem = 0.646). The Ne viii λ770 Å detection has a 3.9 σ significance. At the same velocity we also find absorption lines from C iv, O iii, O iv and N iv. The line parameter measurements yield log [N(Ne viii) cm] = 13.98 −0.13 and b = 49.8± 5.5 km s ....

We report the Giant Metrewave Radio Telescope detection of HI 21cm absorption from the z ∼ 3.39 damped Lyman-α absorber (DLA) towards PKS 0201+113, the highest redshift at which 21cm absorption has been detected in a DLA. The absorption is spread over ∼ 115 km s−1 and has two components, at z = 3.387144(17) and z = 3.386141(45). The stronger component has a redshift and velocity width in agreem...

We present VLT-UVES echelle spectroscopy of the HI and C IV absorption in the spatiallyextended Lyα emission around two high-redshift radio galaxies 0200+015 (z=2.23) and 0943242 (z=2.92). The absorbers in 0943-242 exhibit little additional structure compared with previous lowresolution spectroscopy and the main absorber is still consistent with HI column density of ∼ 10 cm . This is consistent...

The optical absorption of a many (continuum) polaron gas is derived in the framework of a variational approach at zero temperature and weak or intermediate electron-phonon coupling strength. We derive a compact formula for the optical conductivity of the many-polaron system taking into account many-body effects in the electron or hole system. Within the method presented here, these effects are ...

Hydrodynamic simulations of growth of cosmic structure suggest that 30-50% of the total baryons at z = 0 may be in a warm-hot intergalactic medium (WHIM) with temperatures ∼ 10 − 10K. The O VI λλ1032, 1038 absorption line doublet in the FUV portion of QSO spectra provides an important probe of this gas. Utilizing recent hydrodynamic simulations, it is found that there should be ∼ 5 O VI absorpt...

We present and discuss European VLBI Network UHF band spectral line observations, made to localise the redshifted 21cm HI absorption known to occur in the subgalactic sized compact steep spectrum galaxies 3C 49 and 3C 268.3. We have detected H  absorption towards the western radio lobe of 3C 49 and the northern lobe of 3C 268.3. However, we cannot rule out the presence of similar amounts of H ...

The present generation of radio telescopes, combined with powerful new spectrometers, is opening a new age of redshifted radio absorption-line studies. Outfitting of arrays of antennas, such as the European VLBI Network and the upgraded VLA, with flexibly tuned receivers, will measure sizes and kinematics of intervening galaxies as a function of cosmic time. Shortly after the discovery that qua...

We present images and spectroscopy of objects close to the sightline of Q2302+029 in order to search for galaxies responsible for the remarkable z = 0.7 high-ionization absorption line system found by Jannuzi et al. (1996). This system shows ‘normal’ narrow O VI, N V, and C IV lines superimposed on broader (3,000−5,000 km s−1 wide), unsaturated absorption troughs some 56,000 km s−1 away from th...

many studies employing various methods have been carried out into the number densities of excited atoms in electrical discharges with inert gases [1,2,3], but the ranges of the discharge current and gas pressure is very limited in them all. in this work, the population densities of 3s, 3s' of neon have been investigated using the atomic absorption method. since the discharge current and ga...

We present a complete catalogue of 27 O VI absorbers at low redshift (0.12 < z < 0.5) from a blind survey of 16 QSO echelle spectra in the HST/STIS data archive. These absorbers are identified based only upon matching line profiles and the expected doublet ratio between the λλ 1031, 1037 transitions. Subsequent searches are carried out to identify their associated transitions. Here we present a...