A dataset provided by the European Space Agency

Name 014874
Title X-ray weak broad-line quasars: absorption or intrinsic X-ray weakness
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740201
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740301
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740401
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740501
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740601
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740701
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148740801
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148742101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148742201
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148742401
...
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148742501
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0148742601

DOI 10.5270/esa-zrbak7m
Author Mr Guido Risaliti
Description We propose to observe a sample of 20 soft X-ray weak, optically red quasars, discovered by the Hamburg Quasar Survey. The lack of detection in the ROSAT PSPC, despite their relatively bright optical emission make them a peculiar class of quasars, classified as type 1 in the optical but type 2 in the X-rays. Establishing the X-ray properties of these objects is important for (1) the X-ray background synthesis models (they could be the missing "QSO2s"), (2) the unified models (they challenge the traditional torus model) and (3) the long debated problem on the discrepancy between optical and X-ray luminosity functions. XMM provides the unique opportunity to observe a well defined sample of such sources and measure their absorption column density in many cases.
Publication The XMM-Newton serendipitous survey. V. The Second XMM-Newton serendipitous source catalogue . Watson, M. G., Schroder, A. C., et all. . A&A . 493-339 . 2009 . 2009A&A...493..339W ,
The X-ray Energy Dependence of the Relation Between Optical and X-ray Emission in Quasars . Young, M., Elvis, M., . ApJ . 708-1388 . 2010 . 2010ApJ...708.1388Y ,
An Extremely Luminous Panchromatic Outburst from the Nucleus of a Distant Galaxy . Levan, A. J., Tanvir, N. R., et all. . Sci . 333-199 . 2011 . 2011Sci...333..199L ,
Studying the X-ray-UV Variability of Active Galactic Nuclei with data from Swift and XMM archives . Turriziani, Sara, . JPhCS . 280-12005 . 2011 . 2011JPhCS.280a2005T ,
New constraints on the X-ray spectral properties of type 1 active galactic nuclei . Scott, A. E., Stewart, G. C., et all. . MNRAS . 417-992 . 2011 . 2011MNRAS.417..992S ,
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 ,
X-ray Emission from Optically Selected Radio-intermediate and Radio-loud Quasars . Miller, B. P., Brandt, W. N., et all. . ApJ . 726-20 . 2011 . 2011ApJ...726...20M ,
A combined optical and X-ray study of unobscured type 1 active galactic nuclei - I. Optical spectra and spectral energy distribution modelling . Jin, Chichuan, Ward, Martin, et all. . MNRAS . 420...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2002-11-12T07:49:30Z/2003-12-19T00:32:29Z
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 2005-01-20T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2005-01-20T00:00:00Z, 014874, 17.56_20190403_1200. https://doi.org/10.5270/esa-zrbak7m