| Name | 090220 |
| Title | Comparison of X-ray and Optical/UV Eddington Ratio Estimates in Quasars |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0902200301 |
| DOI | https://doi.org/10.57780/esa-fcsoiil |
| Author | European Space Agency |
| Description | We request 190 ks on a uniform sample of 12 optically-selected, low-z, radio-quiet SDSS quasars. The range of L/LEdd complement the virgul60 well-studied, but potentially biased (in terms of L/LEdd) ..reverberation mapped. (RM) quasars. With both SDSS and HST spectroscopy, we are able to estimate L/Ledd from 3 optical/UV-based estimators. X-ray data from Chandra enables a 4th L/LEdd estimator (alpha_ox) for the full sample of 25 objects. The 12 proposed targets lack sufficient Chandra counts to investigate the robustness of the hard X-ray spectral index, Gamma, as an indicator of L/LEdd. Our observations will enable intercomparison of 5 optical/UV and X-ray estimators of L/LEdd for a well-defined sample of quasars. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2022-11-27T14:27:32Z/2022-11-27T19:55:52Z |
| Version | 20.09_20221024_1724 |
| Mission Description | The European Space Agency's (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESA's 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 Earth's 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 | 2023-12-30T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2023, Comparison Of X-Ray And Optical/Uv Eddington Ratio Estimates In Quasars, 20.09_20221024_1724, European Space Agency, https://doi.org/10.57780/esa-fcsoiil |