|Title||Multi-Epoch XMM-EPIC Observations of the Active Nucleus in NGC4258|
|Author||Dr Lincoln J. Greenhill|
|Description||We will search for hard (>2 keV) X-ray spectral variability in the NGC4258 active nucleus with eight, 10-ksec XMM-EPIC observations spaced over the two years covered by AO-1. NGC4258 is noteworthy for its remarkable nuclear megamaser. VLBI imaging of the maser has provided the first direct images of an AGN on sub-parsec scales and has yielded uniquely precise estimates for a number of important and normally inaccessible quantities, such as the AGN central mass and the accretion disk orientation. We will use variability in the X-ray spectrum to explore the three-dimensional geometry of the NGC4258 accretion disk, to determine whether the central engine is obscured by a thin, warped disk as opposed to a thick torus, and to provide tighter constraints on the Fe k line|
|Publication||No observations found associated with the current proposal|
|Instrument||EMOS1, EMOS2, EPN, OM, RGS1, RGS2|
|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.
|Publisher And Registrant||European Space Agency|
|Credit Guidelines||European Space Agency, 2003-06-15T00:00:00Z, 005914, 17.56_20190403_1200. https://doi.org/10.5270/esa-hw7zthc|