| Proposal ID | 030238 |
| 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=0302380201 |
| DOI | https://doi.org/10.5270/esa-sprdm6g |
| Principal Investigator, PI | Dr Ohad Shemmer |
| Abstract | We propose to observe four of the most luminous quasars known, which haveextremely high accretion rates and are at redshift ~2-3, using XMM-Newton EPICPN and MOS with a total integration time of 135 ksec. We will obtain accuratemeasurements of the spectral slope in the quasars ~1.5-20 keV rest-frame bandand look for X-ray variations. Our prime goal is to test whether the X-rayspectral slope is an accretion-rate indicator for all AGN. Steep X-ray spectralslopes may identify our sources as the long sought high-redshift analogs ofnarrow-line Seyfert 1 galaxies. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2005-07-05T07:13:35Z/2005-11-01T06:25:41Z |
| 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 | 2006-12-01T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | "xray spectral slopes", "total integration time", "XMM-Newton", "spectral slope", "xray variations", "accretion rates", "accretion rate", "EPIC", "XMM", "redshift analogs", "xray properties", "xray spectral slope", "accretion rate quasars", "luminous quasars", "narrow line seyfert" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Ohad Shemmer, 2006, '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-sprdm6g |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |