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 km/s and ~14000 km/s. For this sample, with a median distance of ~8000 km/s, we find a bulk flow of amplitude...
| Main Authors: | , , , , |
|---|---|
| Format: | Journal article |
| Published: |
1999
|
| _version_ | 1797082026934796288 |
|---|---|
| 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 km/s and ~14000 km/s. For this sample, with a median distance of ~8000 km/s, we find a bulk flow of amplitude 630+/-200 km/s, towards 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 degrees away from the flow found by Lauer and Postman, but 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 >~ 60 h^-1 Mpc, relative to the predictions of currently-popular cosmological models. |
| first_indexed | 2024-03-07T01:22:22Z |
| format | Journal article |
| id | oxford-uuid:90c9ddb7-ac36-4a99-aec3-57be72785bd5 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T01:22:22Z |
| publishDate | 1999 |
| record_format | dspace |
| spelling | oxford-uuid:90c9ddb7-ac36-4a99-aec3-57be72785bd52022-03-26T23:14:09ZA Large-Scale Bulk Flow of Galaxy ClustersJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:90c9ddb7-ac36-4a99-aec3-57be72785bd5Symplectic Elements at Oxford1999Hudson, 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 km/s and ~14000 km/s. For this sample, with a median distance of ~8000 km/s, we find a bulk flow of amplitude 630+/-200 km/s, towards 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 degrees away from the flow found by Lauer and Postman, but 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 >~ 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 |
| work_keys_str_mv | AT hudsonm alargescalebulkflowofgalaxyclusters AT smithr alargescalebulkflowofgalaxyclusters AT luceyjr alargescalebulkflowofgalaxyclusters AT schlegeld alargescalebulkflowofgalaxyclusters AT daviesr alargescalebulkflowofgalaxyclusters AT hudsonm largescalebulkflowofgalaxyclusters AT smithr largescalebulkflowofgalaxyclusters AT luceyjr largescalebulkflowofgalaxyclusters AT schlegeld largescalebulkflowofgalaxyclusters AT daviesr largescalebulkflowofgalaxyclusters |