| Proposal ID | 015213 |
| Title | Weighing the largest mass concentrations in the Great Attractor region |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0152130101 |
| DOI | https://doi.org/10.5270/esa-f8zjtg4 |
| Principal Investigator, PI | Dr Harald Ebeling |
| Abstract | We propose XMM observations of 10 galaxy clusters at $z<0.075$, located within a $40times 40$ deg$^2$ region around the approximate location of the Great Attractor (GA), to explain the observed large-scale flow toward and beyond the GA. All targets were found in the course of the CIZA X-ray cluster survey, 9 of them are new discoveries. Our total sample of 12, which also includes A3627 andTriangulum Australis, represents a complete census of the most X-ray luminous and thus likely most massive clusters in this region. The proposed observations will allow us to measure accurate cluster masses, which in turn will permit a reconstruction of the local gravitational field that is independent of and complementary to the one based on the density of IRAS-selected field galaxies. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2003-02-10T12:57:32Z/2003-09-06T05:13:13Z |
| Version | 21.51_20241115_1113 |
| Mission Description | The European Space Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs second cornerstone of the Horizon 2000 Science Programme. It carries 3 high throughput X-ray telescopes with an unprecedented effective area, and an optical monitor, the first flown on a X-ray observatory. The large collecting area and ability to make long uninterrupted exposures provide highly sensitive observations. Since Earths atmosphere blocks out all X-rays, only a telescope in space can detect and study celestial X-ray sources. The XMM-Newton mission is helping scientists to solve a number of cosmic mysteries, ranging from the enigmatic black holes to the origins of the Universe itself. Observing time on XMM-Newton is being made available to the scientific community, applying for observational periods on a competitive basis. |
| Creator Contact | https://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk |
| Date Published | 2004-10-09T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "massive cluster", "approximate location", "XMM", "xray luminous", "complete census", "triangulum australis", "attractor region", "scale flow", "largest mass concentrations", "field galaxy", "075 $", "includes a3627", "deg $^", " located", "galaxy cluster", "local gravitational field", "total sample", "cluster masses", "attractor ga" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Harald Ebeling, 2004, 'Weighing the largest mass concentrations in the Great Attractor region', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-f8zjtg4 |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |