Impact of galactic and intergalactic dust on the stellar EBL

0459582 - GFÚ 2017 RIV NL eng J - Journal Article
Vavryčuk, Václav
Impact of galactic and intergalactic dust on the stellar EBL.
Astrophysics and Space Science. Roč. 361, č. 6 (2016), 198/1-198/8. ISSN 0004-640X. E-ISSN 1572-946X
Institutional support: RVO:67985530
Keywords : cosmic background radiation * interstellar dust * light extinction * universe opacity
Subject RIV: BN - Astronomy, Celestial Mechanics, Astrophysics
Impact factor: 1.622, year: 2016

Current theories assume that the low intensity of
the stellar extragalactic background light (stellar EBL) is
caused by finite age of the Universe because the finite-age
factor limits the number of photons that have been pumped
into the space by galaxies and thus the sky is dark in the
night. We oppose this opinion and show that two main factors
are responsible for the extremely low intensity of the
observed stellar EBL. The first factor is a low mean surface
brightness of galaxies, which causes a low luminosity
density in the local Universe. The second factor is light extinction
due to absorption by galactic and intergalactic dust.
Dust produces a partial opacity of galaxies and of the Universe.
The galactic opacity reduces the intensity of light
from more distant background galaxies obscured by foreground
galaxies.
Permanent Link: http://hdl.handle.net/11104/0259764