A dataset provided by the European Space Agency

Name 010507
Title The nature of high Lx-Lopt sources
URL

http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0105070101
http://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0105070201

DOI 10.5270/esa-01narjg
Author Prof Keith Mason
Description GT- While the majority of X-ray sources from serendipitous surveys have been identified, a significant fraction (10-20%) have no optical counterpart down to magnitudes, R~20. These objects have eluded identification to date; possible candidates are diskless quasars, isolated neutron stars, optically-poor clusters, or even a new category of high Lx-Lopt sources not yet discovered. We propose observations of two bright X-ray sources from WGACAT with high optical to X-ray flux ratios (>80, this limit is higher than that for any known class of object). The XMM images will give accurate X-ray positions for these sources which, together with the OM data, provide firm evidence for their identification or for follow-up work, if necessary.
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 ,
The x-ray luminous galaxy cluster population at 0.9 < z ≲ 1.6 as revealed by the XMM-Newton Distant Cluster Project . Fassbender, R., Bohringer, H., et all. . NJPh . 13-125014 . 2011 . 2011NJPh...13l5014F ,
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 ,
A combined optical and X-ray study of unobscured type 1 active galactic nuclei - I. Optical spectra and spectral energy distribution modelling . Jin, Chich...
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2002-07-02T18:38:15Z/2002-07-05T11:21:11Z
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 2003-09-04T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2003-09-04T00:00:00Z, 010507, 17.56_20190403_1200. https://doi.org/10.5270/esa-01narjg