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Assessing cosmic acceleration with the Alcock–Paczyński effect in the SDSS-IV quasar catalogue.
- Source :
-
Monthly Notices of the Royal Astronomical Society: Letters . Nov2020, Vol. 499 Issue 1, pL36-L40. 5p. - Publication Year :
- 2020
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Abstract
- The geometry of the Universe may be probed using the Alcock–Paczyński (AP) effect, in which the observed redshift size of a spherical distribution of sources relative to its angular size varies according to the assumed cosmological model. Past applications of this effect have been limited, however, by a paucity of suitable sources and mitigating astrophysical factors, such as internal redshift-space distortions and poorly known source evolution. In this Letter , we introduce a new test based on the AP effect that avoids the use of spatially bound systems, relying instead on sub-samples of quasars at redshifts z  ≲ 1.5 in the Sloan Digital Sky Survey IV, with a possible extension to higher redshifts and improved precision when this catalogue is expanded by upcoming surveys. We here use this method to probe the redshift-dependent expansion rate in three pertinent Friedmann–Lemaître–Robertson–Walker cosmologies: Λ cold dark matter (ΛCDM), which predicts a transition from deceleration to acceleration at z  ∼ 0.7; Einstein–de Sitter, in which the Universe is always decelerating; and the R h = ct universe, which expands at a constant rate. ΛCDM is consistent with these data, but R h = ct is favoured overall. [ABSTRACT FROM AUTHOR]
- Subjects :
- *DARK matter
*ASTRONOMICAL surveys
*QUASARS
*CATALOGS
*REDSHIFT
*ACTIVE galaxies
Subjects
Details
- Language :
- English
- ISSN :
- 17453925
- Volume :
- 499
- Issue :
- 1
- Database :
- Academic Search Index
- Journal :
- Monthly Notices of the Royal Astronomical Society: Letters
- Publication Type :
- Academic Journal
- Accession number :
- 147110620
- Full Text :
- https://doi.org/10.1093/mnrasl/slaa153