| Name | 006194 |
| Title | Investigating the origin of hard X-ray spectra in broad-line AGN |
| URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0061940101 |
| DOI | https://doi.org/10.5270/esa-ycahljd |
| Author | European Space Agency |
| Description | We have found a population of hard spectrum X-ray AGN which have broad lines. These may be bright examples of the hard sources that dominate the source counts in the 2-10virgulkeV band, and therefore produce most of the X-ray emission in the Universe. These sources are an exciting and surprising discovery because the hard X-ray AGN were expected to have narrow lines. We propose to observe a sample of these AGN with XMM to find out why their X-ray emission is hard. EPIC spectra will enable us to distinguish between absorption of an otherwise standard soft spectral shape, and intrinsically hard emission, perhaps produced by advection dominated accretion. If they are not absorbed, popular models for the origin of the X-ray background will need to be rewritten. |
| Publication | No observations found associated with the current proposal |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2001-01-03T09:52:13Z/2002-04-11T17:43:28Z |
| 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 | 2003-06-07T00:00:00Z |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, 2003, Investigating The Origin Of Hard X-Ray Spectra In Broad-Line Agn, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-ycahljd |