A dataset provided by the European Space Agency

Proposal ID 008234
Title Constraints on H0 from Time-Delay Measurements of PG1115+080
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https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0082340101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0082340201
DOI https://doi.org/10.5270/esa-bse3uos
Principal Investigator, PI Dr GEORGE CHARTAS
Abstract We plan to make use of XMM.s unique capabilities and employ a novel technique tomeasure the gravitational lens time-delay between the lensed images PG1115+080A1 and A2 to an accuracy of about 1percent. PG1115+080 is known to be highlyX-ray variable on short(hours) and long(months) time-scales and the time-delaybetween the closest pair A1 and A2 is expected to be about 5 hours. We thereforeexpect to measure the time-delay within a single XMM observation. We also expectto spatially resolve the diffuse X-ray component of a nearby group of galaxiesthat contributes to the lensing effect. A determination of either the time-delayor the properties of the nearby group of PG1115+080 will significantly reducethe uncertainty in present estimates of H0 based on the gravitational lens
Publications
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2001-11-25T19:09:41Z/2001-11-26T15:30:16Z
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 2002-12-14T00:00:00Z
Keywords "lensing effect", "diffuse xray component", "080 a1", "lensed images pg1115", "closest pair a1", "XMM", "time delay measurements", "single xmm", "time delay", "gravitational lens", "longmonths time scales", "novel technique", "xray variable"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Dr GEORGE CHARTAS, 2002, 'Constraints on H0 from Time-Delay Measurements of PG1115+080', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-bse3uos