# 2007A&A...464..465R

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 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.

ROBAINA A.R. and CEPA J.

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.

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

Full paper

 Number of rows : 2
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 NAME Chandra Deep Field-South reg 03 32 28.0 -27 48 30           ~ 1943 1
2 NAME Hubble Deep Field reg 12 36 49.5 +62 12 58           ~ 1873 1

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2022.05.21-15:38:45