A dataset provided by the European Space Agency

Name 020177
Title TRANSMISSIOM- TO REFLECTION-DOMINATED SPECTRA TRANSITION IN SEYFERT 2 GALAXIES
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0201770201

DOI 10.5270/esa-ah9v5am
Author Dr MATTEO GUAINAZZI
Description "Reflection-dominated" Seyfert 2 galaxies are usually interpreted in terms of an active nucleus covered by a Compton-thick absorber. However, recently discovered transitions between reflection- and transmission-dominated (Compton-thin) states are more convincingly explained as changes in the activity level of the Active Galactic Nucleus (AGN). In order to quantitatively address this issue, we propose to complete the observations of an optically defined, complete and unbiased sample of "Compton-thick" Seyfert 2 galaxies, to measure on a sound statistical basis the rate of reflection- to transmission-dominated state transitions. This requires the observation of still 3 objects - "priority C" targets for the AO2 - for a total allocation time of 60 ks.
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On the origin of soft X-rays in obscured AGN: answers from high-resolution spectroscopy with XMM-Newton . Guainazzi, Matteo, Bianchi, Stefano, . MNRAS . 374-1290 . 2007 . 2007MNRAS.374.1290G ,
Statistical evaluation of the flux cross-calibration of the XMM-Newton EPIC cameras . Mateos, S., Saxton, R. D., et all. . A&A . 496-879 . 2009 . 2009A&A...496..879M ,
The XMM Cluster Survey: optical analysis methodology and the first data release . Mehrtens, Nicola, Romer, A. Kathy, et all. . MNRAS . 423-1024 . 2012 . 2012MNRAS.423.1024M ,
X-ray obscuration and obscured AGN in the local universe . Guainazzi, M., Matt, G., . A&A . 444-119 . 2005 . 2005A&A...444..119G ,
An XMM-Newton Survey of the Soft X-ray Background. I. The O VII and O VIII Lines Between l = 120 and l = 240 . Henley, David B., Shelton, Robin L., . ApJS . 187-388 . 2010 . 2010ApJS..187..388H ,
An All-Sky Atlas of Radio-X-ray Associations . Flesch, E., . PASA . 27-283 . 2010 . 2010PASA...27..283F ,
Fe Kalpha line profile in AGNs: average shape and redshift dependence . Mao, Wei-Ming, Hu, Chen, et all. . RAA . 10-905 . 2010 . 2010RAA....10..905M ,
The X...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2005-02-20T17:03:32Z/2005-02-21T00:18:48Z
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 2006-07-08T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2006-07-08T00:00:00Z, 020177, 17.56_20190403_1200. https://doi.org/10.5270/esa-ah9v5am