Astronomy and Astrophysics – Astrophysics – Cosmology and Extragalactic Astrophysics
Scientific paper
2010-05-25
The Astrophysical Journal 722 (2010) L233-L237
Astronomy and Astrophysics
Astrophysics
Cosmology and Extragalactic Astrophysics
16 pages, 6 figures, Version accepted for publication in The Astrophysical Journal Letters
Scientific paper
10.1088/2041-8205/722/2/L233
In this letter we propose a new and model-independent cosmological test for the distance-duality (DD) relation, \eta=D_{L}(z)(1+z)^{-2}/D_{A}(z)=1, where D_{L} and D_{A} are, respectively, the luminosity and angular diameter distances. For $D_L$ we consider two sub-samples of SNe type Ia taken from Constitution data (2009) whereas $D_A$ distances are provided by two samples of galaxy clusters compiled by De Fillipis et al. (2005) and Bonamente et al. (2006) by combining Sunyaev-Zeldovich effect (SZE) and X-ray surface brightness. The SNe Ia redshifts of each sub-sample were carefully chosen to coincide with the ones of the associated galaxy cluster sample (\Delta z<0.005) thereby allowing a direct test of DD relation. Since for very low redshifts, D_{A}(z) \approxeq D_{L}(z), we have tested the DD relation by assuming that $\eta$ is a function of the redshift parametrized by two different expressions: \eta(z) = 1 + \eta_{0}z and \eta(z) = 1 + \eta_{0}z/(1+z), where \eta_0 is a constant parameter quantifying a possible departure from the strict validity of the reciprocity relation (\eta_0=0). In the best scenario (linear parametrization) we obtain \eta_{0} = -0.28^{+ 0.44}_{- 0.44} (2\sigma$, statistical + systematic errors) for de Fillipis et al. sample (eliptical geometry), a result only marginally compatible with the DD relation. However, for Bonamente et al. sample (spherical geometry) the constraint is \eta_{0} = -0.42^{+ 0.34}_{- 0.34} (3\sigma$, statistical + systematic errors) which is clearly incompatible with the duality-distance relation.
Holanda Rodrigo F. L.
Lima Jose A. S.
Ribeiro Marcelo B.
No associations
LandOfFree
Testing the Distance-Duality Relation with Galaxy Clusters and Type Ia Supernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Testing the Distance-Duality Relation with Galaxy Clusters and Type Ia Supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Testing the Distance-Duality Relation with Galaxy Clusters and Type Ia Supernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-296995