Name | 005914 |
Title | Multi-Epoch XMM-EPIC Observations of the Active Nucleus in NGC4258 |
URL | https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140101 |
DOI | https://doi.org/10.5270/esa-hw7zthc |
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 |
Temporal Coverage | 2001-05-06T18:50:18Z/2002-05-23T02:04:01Z |
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 | 2003-06-15T00:00:00Z |
Publisher And Registrant | European Space Agency |
Credit Guidelines | European Space Agency, Dr Lincoln J. Greenhill, 2003, 005914, 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-hw7zthc |