| Name | 079573 |
| Title | TRACKING ACCRETION POWER INTO THE LOW LUMINOSITY REGIME |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0795730101 |
| DOI | https://doi.org/10.5270/esa-ezbcisd |
| Author | Dr Patricia Arevalo |
| Description | The accretion flow in AGN changes its structure when the accretion rate drops. High power AGN are softer when brighter while low-luminosity sources do the opposite. The transition point is not well known, largely because of the imprecise determination of the spectral slope, whose dynamic range is very small. What happens to the accretion flow at low rates is also not well understood, either a RIAF or a jet are possible. In this proposal we target three low accretion rate AGN to measure their spectral slope, and confirm or reject spectral curvature, which would point to a RIAF. The targets belong to a flux limited sample covering a wide range in accretion rates. They fill the mid-low L/L Edd range, crucial to follow the evolution of the X-ray emission at the turning point. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2017-10-24T11:15:19Z/2017-10-24T21:48:39Z |
| Version | 17.56_20190403_1200 |
| 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 | 2018-11-14T23:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Patricia Arevalo, 2018, 079573, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ezbcisd |