A dataset provided by the European Space Agency

Name 005914
Title Multi-Epoch XMM-EPIC Observations of the Active Nucleus in NGC4258
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140201
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140401
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0059140901

DOI 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
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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, 2003-06-15T00:00:00Z, 005914, 17.56_20190403_1200. https://doi.org/10.5270/esa-hw7zthc