Intergalactic extinction and the deceleration parameter | Zendy

Meinel R. | Zendy

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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.

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