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Intergalactic extinction and the deceleration parameter
Author(s) -
Meinel R.
Publication year - 1981
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.19813020402
Subject(s) - intergalactic travel , extinction (optical mineralogy) , astrophysics , physics , intergalactic dust , redshift , galaxy , intergalactic medium , optics
The deceleration parameter q 0 is calculated from the relation between apparent magnitudes m of the brightest galaxies in clusters and their redshifts z considering an intergalactic extinction. The calculation is valid for a Friedman universe, homogeneously filled with dust grains, assuming the extinction to be 0.5 mag at z = 1 and a λ −1 ‐law of extinction (according to Oleak and Schmidt 1976). Using the m , z ‐values of Kristian, Sandage, and Westphal (1978) a formal value of q 0 ≈ 2.1 is obtained instead of q 0 ≈ 1.6 without consideration of intergalactic extinction.