Observations of the Ly-α Forest
| Autor: | Marek Demianski, A. Doroshkevich |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
education.field_of_study Absorption spectroscopy Hydrogen Population Relative velocity chemistry.chemical_element Astronomy and Astrophysics Astrophysics 01 natural sciences Stability (probability) Redshift symbols.namesake chemistry Space and Planetary Science 0103 physical sciences symbols 010306 general physics education 010303 astronomy & astrophysics Doppler effect Line (formation) |
| Zdroj: | Astronomy Reports. 62:859-867 |
| ISSN: | 1562-6881 1063-7729 |
| DOI: | 10.1134/s1063772918120193 |
| Popis: | We analyze four high resolution rich samples of Ly-α and metal lines (two at z ≥ 2 and two at z ≤ 0.2). We describe evolution of the observed Doppler parameters and absorbers separation and propose a model of the forest. We argue that all absorption lines are formed in gaseous caustics created in stable DM subclouds. The absorption lines are described by two local characteristics, the Doppler parameter and the column density of neutral hydrogen. We show that evolution of the Doppler parameter is very slow and its mean value increases by a factor ≤1.5 at redshifts 0 ≤ z ≤ 3. We show that absorbers separation increases as |
| Databáze: | OpenAIRE |
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