A dataset provided by the European Space Agency

Name 020066
Title SEARCHING FOR 'CHANGING LOOK. SEYFERT GALAXIES
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0200660101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0200660201
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0200660301
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0200660401

DOI 10.5270/esa-c33dh8g
Author Prof GIORGIO MATT
Description With the aim of discovering more sources which change their appearance from Compton--thin (if Seyfert 2s) or unabsorbed (if Seyfert 1s) to reflection--dominated, we propose to observe, for 10 ks each, four objects which have been proposed to be the optical counterparts of X--ray sources in the Grossan LMA HEAO1 catalog. The four candidate counterparts have been later on observed with imaging X-ray instruments, and found on those occasions to be much fainter. The XMM- Newton observations, if catching the sources at much brighter fluxes than during the previous hard X--ray imaging observations, would confirm their transient nature.
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A Broadband X-Ray Study of a Sample of AGNs with [O III] Measured Inclinations . Zhao, X., Marchesi, S., et all. . ApJ . 894-71 . 2020 . 2020ApJ...894...71Z ,
A Comparison of X-Ray Photon Indices among the Narrow- and Broad-line Seyfert 1 Galaxies . Ojha, Vineet, Chand, Hum, et all. . ApJ . 896-95 . 2020 . 2020ApJ...896...95O ,
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A Hard Look at Local, Optically Selected, Obscured Seyfert Galaxies . Kammoun, E. S., Miller, J. M., et all. . ApJ . 901-161 . 2020 . 2020ApJ...901..161K ,
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2004-06-02T14:52:45Z/2004-09-21T01:23:33Z
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 2005-10-20T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2005-10-20T00:00:00Z, 020066, 17.56_20190403_1200. https://doi.org/10.5270/esa-c33dh8g