2007A&A...467..421D


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST04:34:16

2007A&A...467..421D - Astronomy and Astrophysics, volume 467, 421-426 (2007/5-4)

Age constraints on the cosmic equation of state.

DANTAS M.A., ALCANIZ J.S., JAIN D. and DEV A.

Abstract (from CDS):

Dark energy is the invisible fuel that seems to drive the current acceleration of the Universe. Its presence, which is inferred from an impressive convergence of high-quality observational results along with some sucessful theoretical predictions, is also supported by the current estimates of the age of the Universe from dating of local and high-z objects. In this work we study observational constraints on the dark energy equation of state (w) from lookback time measurements of high-z galaxies, as recently published by the Gemini Deep Deep Survey (GDDS). To build up our lookback time sample from these observations we use 8 high-z galaxies in the redshift interval 1.3≤z≤2.2 and assume the total expanding age of the Universe to be t0obs=13.6+0.4–0.3Gyr, as obtained from current cosmic microwave background data. We show that these age measurements are compatible with values of w close to -1, although there is still space for quintessence (w>-1) and phantom (w←1) behaviors. To break possible degeneracies in the Ωm-w plane, we also discuss the bounds on this parametric space when GDDS lookback time measurements are combined with the most recent SNe Ia, CMB, and LSS data.

Abstract Copyright:

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

Simbad objects: 3

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Number of rows : 3

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 QSO J0831+5245 QSO 08 31 41.7095363198 +52 45 17.620340544   19.2   14.5 13.9 ~ 501 1
2 WSTB 53W69 rG 17 20 02.54 +49 44 51.0           ~ 38 0
3 WSTB 53W91 rG 17 22 32.73 +50 06 01.9           ~ 78 0

    Equat.    Gal    SGal    Ecl

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