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Titolo:
Simulating reionization in numerical cosmology
Autore:
Sokasian, A; Abel, T; Hernquist, LE;
Indirizzi:
Harvard Univ, Dept Astron, Cambridge, MA 02138 USA Harvard Univ CambridgeMA USA 02138 Dept Astron, Cambridge, MA 02138 USA
Titolo Testata:
NEW ASTRONOMY
fascicolo: 6, volume: 6, anno: 2001,
pagine: 359 - 379
SICI:
1384-1092(200109)6:6<359:SRINC>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
HIGH-REDSHIFT QUASARS; LYMAN-ALPHA FOREST; RADIATIVE-TRANSFER; INTERGALACTIC MEDIUM; LUMINOSITY FUNCTION; IONIZING-RADIATION; CLUMPY UNIVERSE; ABSORPTION; HELIUM; RESOLUTION;
Keywords:
radiative transfer; cosmology; theory; intergalactic medium;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
48
Recensione:
Indirizzi per estratti:
Indirizzo: Sokasian, A Harvard Univ, Dept Astron, Cambridge, MA 02138 USA Harvard Univ Cambridge MA USA 02138 , Cambridge, MA 02138 USA
Citazione:
A. Sokasian et al., "Simulating reionization in numerical cosmology", NEW ASTRON, 6(6), 2001, pp. 359-379

Abstract

The incorporation of radiative transfer effects into cosmological hydrodynamical simulations is essential for understanding how the intergalactic medium (IGM) makes the transition from a neutral medium to one that is almost fully ionized. Here, we present an approximate numerical method designed tostudy in a statistical sense, how a cosmological density field is ionized by a set of discrete point sources. A diffuse background radiation field isalso computed self-consistently in our procedure. The method requires relatively few time steps and can be employed with simulations having high resolution. We describe the details of the algorithm and provide a description of how the method can be applied to the output from a pre-existing cosmological simulation to study the systematic reionization of a particular ionic species. As a first application, we compute the reionization of He II by quasars in the range 3 less than or similar to z less than or similar to 6. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 01/04/20 alle ore 20:59:43