Intergalactic Medium
نویسندگان
چکیده
منابع مشابه
Galaxies and Intergalactic Matter at Redshift Z ∼ 3: Overview
We present the first results from a survey of the relative spatial distributions of galaxies, intergalactic neutral hydrogen, and intergalactic metals at high redshift. We obtained high-resolution spectra of 8 bright QSOs at 3.1 < z < 4.1 and spectroscopic redshifts for 431 Lyman-break galaxies (LBGs) at slightly lower redshifts. Comparing the locations of galaxies to the absorption lines in th...
متن کاملLyα Absorption Systems and the Intergalactic Medium
The last few years have seen a dramatic improvement in our understanding of the origin of Lyman α absorption systems. Hydrodynamic numerical simulations of cold dark matter dominated universes have shown that the many properties of the Lyman α absorption systems can be explained by a photoionized, space-filling, intergalactic medium. Lyman α lines offer promising probes of the photoionizing bac...
متن کاملFuture instrumentation for the study of the Warm - Hot Intergalactic Medium
We briefly review capabilities and requirements for future instrumentation in UVand X-ray astronomy that can contribute to advancing our understanding of the diffuse, highly ionised intergalactic medium.
متن کاملObservational Tests of Intergalactic Enrichment Models
We summarize recent results assessing the carbon and silicon abundances of the intergalactic medium (IGM) using the ‘pixel optical depth’ technique. We briefly discuss the implications of these results for models of intergalactic enrichment, focusing on distinguishing ‘early’ z ≫ 4 enrichment by the first generations of stars and objects from ‘late’ enrichment by 2 ∼ z ∼ 5 Lybreak galaxies. We ...
متن کاملX-ray Observations of the Warm- Hot Intergalactic Medium
We present Chandra observations that provide the most direct evidence to date for the pervasive, moderate density, shock-heated intergalactic medium predicted by leading cosmological scenarios. We also comment briefly on future observations with Constellation-X.
متن کاملLower Metal Enrichment of Virialized Gas in Minihalos
We differentiate between the metal enrichment of the gas in virialized minihalos and that of the intergalactic medium at high redshift, pertinent to cosmological reionization, with the initial expectation that gas in the high density regions within formed dark matter halos may be more robust thus resistant to mixing with lower density intergalactic medium. Using detailed hydrodynamic simulation...
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