| Proposal ID | 040502 |
| Title | Unabsorbed type 2 Seyfert galaxies: a challenge for Unified Models |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0405020601 |
| DOI | https://doi.org/10.5270/esa-1j3imjr |
| Principal Investigator, PI | Dr Stefano Bianchi |
| Abstract | We propose to observe with XMM-Newton a sample of bona-fide Seyfert 2 galaxieswith no X-ray absorption. The selected sources are a conservative subsampletaken from the Panessa & Bassani (2002) sample, including only Seyfert 2s whereno column density in excess of the Galactic one has ever been observed in theX-rays, within sensitive limits. The primary goal of this proposal is to findobjects unabsorbed in the X-rays and without broad optical lines, which wouldrepresent a serious challenge to simple AGN Unification Models. The key to findgenuine unabsorbed Seyfert 2s, excluding variability issues, is to performsimultaneous X-ray and optical spectroscopy. We therefore intend to coordinateground-based optical observations with the XMM-Newton observations. |
| Publications |
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| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2006-10-06T14:47:22Z/2006-11-23T08:28:28Z |
| Version | 17.56_20190403_1200 |
| 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 | 2008-01-04T00:00:00Z |
| Last Update | 2026-03-04 |
| Keywords | "sensitive limits", "xmm newton", "XMM", "objects unabsorbed", "unabsorbed type", "seyfert galaxy", "column density", "conservative subsample", "bona fide", "XMM-Newton", "xray absorption", "bassani 2002 sample", "unified models", "broad optical lines", "coordinate ground", "optical spectroscopy", "seyfert 2s" |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Stefano Bianchi, 2008, 'Unabsorbed type 2 Seyfert galaxies: a challenge for Unified Models', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-1j3imjr |