Proposal ID | 008559 |
Title | An X-ray spectroscopic determination of the Hubble constant |
Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0085590201 |
DOI | https://doi.org/10.5270/esa-3hychlr |
Principal Investigator, PI | Dr Frits Paerels |
Abstract | We propose to observe the Perseus cluster, in order to accurately constrain the spatial distribution of the Fe XXV n=3-1 to n=2-1 fluxes. The n=2-1 resonance line is known to be optically thick to scattering, the n=3-1 lines are not. The ratio map therefore provides a direct measure of the resonance scattering depth, which, when combined with the volume emission measure and the angular size of the cluster, produces an estimate of the absolute distance in a manner entirely analogous to the Sunyaev-Zeldovich effect. Together with the redshift, this gives the Hubble constant directly, just from spatially resolved X-ray spectroscopy. |
Publications |
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Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
Temporal Coverage | 2001-02-10T07:15:05Z/2001-02-10T19:16:02Z |
Version | 17.56_20190403_1200 |
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 | 2002-09-22T00:00:00Z |
Last Update | 2025-01-27 |
Keywords | "spatial distribution", "optically thick", "perseus cluster", "xray spectroscopic", "resolved xray spectroscopy", "fe xxv", "absolute distance", "resonance scattering depth", "ratio map", "hubble constant", "angular size", "volume emission", "sunyaev zeldovich effect", "resonance line" |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Dr Frits Paerels, 2002, 'An X-ray spectroscopic determination of the Hubble constant', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-3hychlr |