| Proposal ID | 090435 |
| Title | Quantifying X-Ray Spectral Variability in a New Sample of Changing-State AGN |
| Download Data Associated to the proposal | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0904350201 |
| DOI | https://doi.org/10.57780/esa-uj4ga5t |
| Principal Investigator, PI | Dr Matthew Temple |
| Abstract | We propose XMM-Newton observations of four local AGN which have recently beenobserved to transition between types 1 and 2 (or vice versa). Our targets wereidentified in a thorough search of the BASS sample of BAT-selected AGN, and havemulti-epoch optical spectra covering the past 10-20 years. Each source has anarchival X-ray spectrum from either XMM-Newton, Chandra or SWIFT, allowing us tocompare their current X-ray spectral properties with those observed before theoptical state transition. The proposed observations will provide a unique andtimely insight into accretion disc physics, inform our understanding of when andhow the Broad Emission Line Region is formed around AGN, and provide a valuablebenchmark in studies of changing-state AGN. |
| Publications | No publications found for current proposal! |
| Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
| Temporal Coverage | 2022-07-27T14:06:41Z/2022-12-03T11:34:15Z |
| 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 | 2023-12-31T00:00:00Z |
| Last Update | 2026-07-09 |
| Keywords | XMM-Newton, OM, RGS, EPIC, X-ray, Multi-Mirror, SAS |
| Publisher And Registrant | European Space Agency |
| Credit Guidelines | European Space Agency, Dr Matthew Temple, 2023, 'Quantifying X-Ray Spectral Variability in a New Sample of Changing-State AGN', 21.51_20241115_1113, European Space Agency, https://doi.org/10.57780/esa-uj4ga5t |
| Rights | Data hosted in the ESA Space Science Archives are distributed under the CC BY-NC 3.0 IGO license. |