| Proposal ID | 040207 |
| Title | A Search for Unusual X-ray Properties in High-z, High Accretion-Rate Quasars |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0402070101 |
| DOI | https://doi.org/10.5270/esa-p518i5d |
| Principal Investigator, PI | Dr Ohad Shemmer |
| Abstract | We propose to extend our XMM-Newton observations of extremely luminous, highaccretion rate, radio-quiet quasars at z~2-3, by observing five additionalsources of this class with a total exposure time of 175 ks. Combined with ourXMM-Newton AO4 observations of two such sources, we will obtain accuratemeasurements of the spectral slope in the ~1.5-20 keV rest-frame band and lookfor X-ray variations in a sample of seven extreme quasars. Our prime goal is totest whether the X-ray spectral slope is an accretion-rate indicator for allAGN. Steep X-ray spectral slopes may identify our sources as the long soughthigh-z analogs of Narrow-Line Seyfert 1 galaxies. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2006-11-12T00:15:39Z/2007-01-09T07:39:54Z |
| Version | 21.51_20241115_1113 |
| 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 | 2008-02-03T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "xray spectral slopes", "XMM-Newton", "spectral slope", "z analogs", "total exposure time", "additional sources", "radio quiet quasars", "xray variations", "accretion rate", "XMM", "xmm newton", "xray properties", "xray spectral slope", "accretion rate quasars", "xmm newton ao4", "narrow line seyfert" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Ohad Shemmer, 2008, 'A Search for Unusual X-ray Properties in High-z, High Accretion-Rate Quasars', 21.51_20241115_1113, European Space Agency, https://doi.org/10.5270/esa-p518i5d |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |