ar X iv : a st ro - p h / 01 10 65 9 v 1 3 0 O ct 2 00 1 Probing the OVI forest
نویسندگان
چکیده
Recent FUSE and STIS observations of O vi absorption at low redshift along the sightline to distant quasars have been interpreted as the signature of a warm-hot diffuse component of the intergalactic medium (IGM). In these proceedings we show that the predicted numbers of such absorbers in numerical simulations agree with the observed characteristics, lending support to this idea. We find that collisionally ionized lines tend to be stronger and wider, while photo-ionized absorbers are weaker and narrower. We also find that a comparison of the predicted distribution of line widths to that observed is marginally too low.
منابع مشابه
ar X iv : a st ro - p h / 01 10 21 1 v 1 9 O ct 2 00 1 Quintessence – the Dark Energy in the Universe ?
Quintessence – the energy density of a slowly evolving scalar field – may constitute a dynamical form of the homogeneous dark energy in the universe. We review the basic idea and indicate observational tests which may distinguish quintessence from a cosmological constant.
متن کاملar X iv : a st ro - p h / 06 10 24 6 v 1 9 O ct 2 00 6 Special Features of Galactic Dynamics
متن کامل
ar X iv : a st ro - p h / 02 01 05 0 v 1 4 J an 2 00 2 Probing the evolution of massive galaxies with the K 20 survey ⋆
The motivations and the status of the K20 survey are presented. The first results on the evolution of massive galaxies and the comparison with the predictions of the currently competing scenarios of galaxy formation are also discussed.
متن کاملar X iv : a st ro - p h / 04 10 65 7 v 1 27 O ct 2 00 4 Detection of the linear radical HC 4 N in IRC + 10216
We report the detection of the linear radical HC 4
متن کاملar X iv : a st ro - p h / 01 10 44 7 v 1 1 9 O ct 2 00 1 1 ON INVERTING ASTEROSEISMIC DATA
Some issues of inverting asteroseismic frequency data are discussed, including the use of model calibration and linearized inversion. An illustrative inversion of artificial data for solar-type stars, using least-squares fitting of a small set of basis functions, is presented. A few details of kernel construction are also given.
متن کامل