| Proposal ID | 008234 |
| Title | Constraints on H0 from Time-Delay Measurements of PG1115+080 |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0082340101 |
| DOI | https://doi.org/10.5270/esa-bse3uos |
| Principal Investigator, PI | Dr GEORGE CHARTAS |
| Abstract | We plan to make use of XMMs 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 |
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| 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 |
| Last Update | 2025-01-27 |
| Keywords | "closest pair a1", "longmonths time scales", "XMM", "080 a1", "time delay", "lensed images pg1115", "xray variable", "lensing effect", "gravitational lens", "diffuse xray component", "time delay measurements", "novel technique", "single xmm" |
| 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 |