Query : 2007A&A...464..465R

2007A&A...464..465R - Astronomy and Astrophysics, volume 464, 465-470 (2007/3-3)

Redshift-distance relations from type Ia supernova observations. New constraints on grey dust models.


Abstract (from CDS):

Extinction due to intergalactic grey dust has been proposed as an alternative to accelerated expansion to account for the dimming of SnIa fluxes beyond z≃0.5. The ``replenishing'' grey dust model, although fitting the observational data, does not seem to be based on physical assumptions. For this reason, in this paper we propose a new grey dust model whose dust distribution follows the comoving SFR density evolution, a reasonably established phenomenon. This new model is compared with the updated photometric data sample from the High Z Supernova Search Team (HZT). Also, using pairs of supernovae at different redshifts, the possibility of any ``patchy'' distribution proposed to explain the discrepancies between the ``high z'' dust model and the SnIa observations at very high redshift (z≥0.9) is ruled out. Finally, the data are compared with different models with and without dark energy and a best fit to a universe with adimensional parameters Ωm0=0.31 and ΩΛ0=0.69 is obtained, from which an age of the universe of t0≃14.6x109years is derived. This age is compatible with the age of the globular clusters using an equation of state ω=-1 and it obviates the need to resort to any kind of phantom energy.

Abstract Copyright:

Journal keyword(s): cosmological parameters - cosmology: theory - distance scale - galaxy: abundances

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 2045 1
2 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1907 1

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