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Universe opacity and EBL

SYSNO ASEP	0464773
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Universe opacity and EBL
Author(s)	Vavryčuk, Václav (GFU-E)_{ORCID, RID}
Source Title	Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711 Roč. 465, č. 2 (2017), s. 1532-1542
Number of pages	11 s.
Publication form	Print - P
Language	eng - English
Country	GB - United Kingdom
Keywords	cosmic background radiation ; dust, extinction ; early Universe ; galaxies: high redshift ; galaxies: ISM ; intergalactic medium
Subject RIV	BN - Astronomy, Celestial Mechanics, Astrophysics
OECD category	Astronomy (including astrophysics,space science)
Institutional support	GFU-E - RVO:67985530
UT WOS	000393785500018
DOI	10.1093/mnras/stw2825
Annotation	The observed extragalactic background light (EBL) is affected by light attenuation due to absorption of light by galactic and intergalactic dust in the Universe. Even galactic opacity of 10-20 per cent and minute universe intergalactic opacity of 0.01 mag h Gpc(-1) at the local Universe have a significant impact on the EBL because obscuration of galaxies and density of intergalactic dust increase with redshift as (1 + z)(3). Consequently, intergalactic opacity increases and the Universe becomes considerably opaque at z > 3. Adopting realistic values for galactic and intergalactic opacity, the estimates of the EBL for the expanding dusty universe are close to observations. The luminosity density evolution fits well measurements. The model reproduces a steep increase of the luminosity density at z < 2, its maximum at z = 2-3, and its decrease at higher redshifts. The increase of the luminosity density at low z is not produced by the evolution of the star formation rate but by the fact that the Universe occupied a smaller volume in previous epochs. The decline of the luminosity density at high z originates in the opacity of the Universe. The calculated bolometric EBL ranges from 100 to 200 nW m(-2) sr(-1) and is within the limits of 40 and 200 nW m(-2) sr(-1) of current EBL observations. The model predicts 98 per cent of the EBL coming from radiation of galaxies at z < 3.5. Accounting for light extinction by intergalactic dust implies that the Universe was probably more opaque than dark for z > 3.5.
Workplace	Geophysical Institute
Contact	Hana Krejzlíková, kniha@ig.cas.cz, Tel.: 267 103 028
Year of Publishing	2018

Number of the records: 1