Name | 090435 |
Title | Quantifying X-Ray Spectral Variability in a New Sample of Changing-State AGN |
URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0904350201 |
DOI | https://doi.org/10.57780/esa-uj4ga5t |
Author | European Space Agency |
Description | We propose XMM-Newton observations of four local AGN which have recently been observed to transition between types 1 and 2 (or vice versa). Our targets were identified in a thorough search of the BASS sample of BAT-selected AGN, and have multi-epoch optical spectra covering the past 10-20 years. Each source has an archival X-ray spectrum from either XMM-Newton, Chandra or SWIFT, allowing us to compare their current X-ray spectral properties with those observed before the optical state transition. The proposed observations will provide a unique and timely insight into accretion disc physics, inform our understanding of when and how the Broad Emission Line Region is formed around AGN, and provide a valuable benchmark in studies of changing-state AGN. |
Publication | No observations found associated with the current proposal |
Instrument | EMOS1, EMOS2, EPN, OM, RGS1, RGS2 |
Temporal Coverage | 2022-07-27T14:06:41Z/2022-12-03T11:34:15Z |
Version | 20.09_20221024_1724 |
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 | 2023-12-31T00:00:00Z |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, 2023, Quantifying X-Ray Spectral Variability In A New Sample Of Changing-State Agn, 20.09_20221024_1724, European Space Agency, https://doi.org/10.57780/esa-uj4ga5t |