A large-scale bulk flow of galaxy clusters
We report first results from the Streaming Motions of Abell Clusters (SMAC) project, an all-sky Fundamental Plane survey of 699 early-type galaxies in 56 clusters between ∼3000 and ∼14,000 km s-1. For this sample, with a median distance of ∼8000 km s-1, we find a bulk flow of amplitude 630 ± 200 km...
| Main Authors: | , , , , |
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| Format: | Journal article |
| Language: | English |
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Institute of Physics Publishing
1999
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| _version_ | 1797053221548589056 |
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| author | Hudson, M Smith, R Lucey, JR Schlegel, D Davies, R |
| author_facet | Hudson, M Smith, R Lucey, JR Schlegel, D Davies, R |
| author_sort | Hudson, M |
| collection | OXFORD |
| description | We report first results from the Streaming Motions of Abell Clusters (SMAC) project, an all-sky Fundamental Plane survey of 699 early-type galaxies in 56 clusters between ∼3000 and ∼14,000 km s-1. For this sample, with a median distance of ∼8000 km s-1, we find a bulk flow of amplitude 630 ± 200 km s-1 toward l = 260 ± 15°, b = -1 ± 12° with respect to the cosmic microwave background. The flow is robust against the effects of individual clusters and data subsets, the choice of Galactic extinction maps, Malmquist bias, and stellar population effects. The direction of the SMAC flow is ∼90° away from the flow found by Lauer and Postman, but it is in good agreement with the gravity dipole predicted from the distribution of X-ray-luminous clusters. Our detection of a high-amplitude coherent flow on such a large scale argues for excess mass density fluctuation power at wavelengths λ ≳ 60 h-1 Mpc, relative to the predictions of currently popular cosmological models. |
| first_indexed | 2024-03-06T18:40:55Z |
| format | Journal article |
| id | oxford-uuid:0cd4b2f2-4604-4c88-b722-de58c2b2f5b2 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T18:40:55Z |
| publishDate | 1999 |
| publisher | Institute of Physics Publishing |
| record_format | dspace |
| spelling | oxford-uuid:0cd4b2f2-4604-4c88-b722-de58c2b2f5b22022-03-26T09:37:09ZA large-scale bulk flow of galaxy clustersJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:0cd4b2f2-4604-4c88-b722-de58c2b2f5b2EnglishSymplectic Elements at OxfordInstitute of Physics Publishing1999Hudson, MSmith, RLucey, JRSchlegel, DDavies, RWe report first results from the Streaming Motions of Abell Clusters (SMAC) project, an all-sky Fundamental Plane survey of 699 early-type galaxies in 56 clusters between ∼3000 and ∼14,000 km s-1. For this sample, with a median distance of ∼8000 km s-1, we find a bulk flow of amplitude 630 ± 200 km s-1 toward l = 260 ± 15°, b = -1 ± 12° with respect to the cosmic microwave background. The flow is robust against the effects of individual clusters and data subsets, the choice of Galactic extinction maps, Malmquist bias, and stellar population effects. The direction of the SMAC flow is ∼90° away from the flow found by Lauer and Postman, but it is in good agreement with the gravity dipole predicted from the distribution of X-ray-luminous clusters. Our detection of a high-amplitude coherent flow on such a large scale argues for excess mass density fluctuation power at wavelengths λ ≳ 60 h-1 Mpc, relative to the predictions of currently popular cosmological models. |
| spellingShingle | Hudson, M Smith, R Lucey, JR Schlegel, D Davies, R A large-scale bulk flow of galaxy clusters |
| title | A large-scale bulk flow of galaxy clusters |
| title_full | A large-scale bulk flow of galaxy clusters |
| title_fullStr | A large-scale bulk flow of galaxy clusters |
| title_full_unstemmed | A large-scale bulk flow of galaxy clusters |
| title_short | A large-scale bulk flow of galaxy clusters |
| title_sort | large scale bulk flow of galaxy clusters |
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