The 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO Power Spectrum
We report on measurements of the cosmological constant, Lambda, and the redshift space distortion parameter beta=Omega_m^0.6/b, based on an analysis of the QSO power spectrum parallel and perpendicular to the observer's line of sight, from the final catalogue of the 2dF QSO Redshift Survey. We...
| Main Authors: | , , , , , , , |
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| פורמט: | Journal article |
| יצא לאור: |
2003
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| _version_ | 1826270919447805952 |
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| author | Outram, P Shanks, T Boyle, B Croom, S Hoyle, F Loaring, N Miller, L Smith, R |
| author_facet | Outram, P Shanks, T Boyle, B Croom, S Hoyle, F Loaring, N Miller, L Smith, R |
| author_sort | Outram, P |
| collection | OXFORD |
| description | We report on measurements of the cosmological constant, Lambda, and the redshift space distortion parameter beta=Omega_m^0.6/b, based on an analysis of the QSO power spectrum parallel and perpendicular to the observer's line of sight, from the final catalogue of the 2dF QSO Redshift Survey. We derive a joint Lambda - beta constraint from the geometric and redshift-space distortions in the power spectrum. By combining this result with a second constraint based on mass clustering evolution, we break this degeneracy and obtain strong constraints on both parameters. Assuming a flat cosmology and a Lambda cosmology r(z) function to convert from redshift into comoving distance, we find best fit values of Omega_Lambda=0.71^{+0.09}_{-0.17} and beta(z~1.4)=0.45^{+0.09}_{-0.11}. Assuming instead an EdS cosmology r(z) we find that the best fit model obtained, with Omega_Lambda=0.64^{+0.11}_{-0.16} and beta(z~1.4)=0.40^{+0.09}_{-0.09}, is consistent with the Lambda r(z) results, and inconsistent with a Lambda=0 flat cosmology at over 95 per cent confidence. |
| first_indexed | 2024-03-06T21:48:25Z |
| format | Journal article |
| id | oxford-uuid:4a68c7d4-9be4-45ff-b839-ddbd3e76ee83 |
| institution | University of Oxford |
| last_indexed | 2024-03-06T21:48:25Z |
| publishDate | 2003 |
| record_format | dspace |
| spelling | oxford-uuid:4a68c7d4-9be4-45ff-b839-ddbd3e76ee832022-03-26T15:37:20ZThe 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO Power SpectrumJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:4a68c7d4-9be4-45ff-b839-ddbd3e76ee83Symplectic Elements at Oxford2003Outram, PShanks, TBoyle, BCroom, SHoyle, FLoaring, NMiller, LSmith, RWe report on measurements of the cosmological constant, Lambda, and the redshift space distortion parameter beta=Omega_m^0.6/b, based on an analysis of the QSO power spectrum parallel and perpendicular to the observer's line of sight, from the final catalogue of the 2dF QSO Redshift Survey. We derive a joint Lambda - beta constraint from the geometric and redshift-space distortions in the power spectrum. By combining this result with a second constraint based on mass clustering evolution, we break this degeneracy and obtain strong constraints on both parameters. Assuming a flat cosmology and a Lambda cosmology r(z) function to convert from redshift into comoving distance, we find best fit values of Omega_Lambda=0.71^{+0.09}_{-0.17} and beta(z~1.4)=0.45^{+0.09}_{-0.11}. Assuming instead an EdS cosmology r(z) we find that the best fit model obtained, with Omega_Lambda=0.64^{+0.11}_{-0.16} and beta(z~1.4)=0.40^{+0.09}_{-0.09}, is consistent with the Lambda r(z) results, and inconsistent with a Lambda=0 flat cosmology at over 95 per cent confidence. |
| spellingShingle | Outram, P Shanks, T Boyle, B Croom, S Hoyle, F Loaring, N Miller, L Smith, R The 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO Power Spectrum |
| title | The 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO
Power Spectrum |
| title_full | The 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO
Power Spectrum |
| title_fullStr | The 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO
Power Spectrum |
| title_full_unstemmed | The 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO
Power Spectrum |
| title_short | The 2dF QSO Redshift Survey - XIII. A Measurement of Lambda from the QSO
Power Spectrum |
| title_sort | 2df qso redshift survey xiii a measurement of lambda from the qso power spectrum |
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