A dataset provided by the European Space Agency

Proposal ID 010507
Title The nature of high Lx/Lopt sources
Download Data Associated to the proposal

https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0105070101
https://nxsa.esac.esa.int/nxsa-sl/servlet/data-action-aio?obsno=0105070201
DOI https://doi.org/10.5270/esa-01narjg
Principal Investigator, PI Prof Keith Mason
Abstract GT- While the majority of X-ray sources from serendipitous surveys have beenidentified, a significant fraction (10-20%) have no optical counterpart down tomagnitudes, Rvirgul20. These objects have eluded identification to date; possiblecandidates are diskless quasars, isolated neutron stars, optically-poorclusters, or even a new category of high Lx/Lopt sources not yet discovered. Wepropose observations of two bright X-ray sources from WGACAT with high opticalto X-ray flux ratios (>80, this limit is higher than that for any known classof object). The XMM images will give accurate X-ray positions for these sourceswhich, together with the OM data, provide firm evidence for theiridentification or for follow-up work, if necessary.
Publications
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 Agencys (ESA) X-ray Multi-Mirror Mission (XMM-Newton) was launched by an Ariane 504 on December 10th 1999. XMM-Newton is ESAs 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 Earths 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
Keywords "lopt sources", "optical counterpart", "xray sources", "bright xray sources", "XMM", "om data", "eluded identification", "isolated neutron stars", "firm evidence", "xmm images", "xray flux ratios", "xray positions", "diskless quasars"
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, Prof Keith Mason, 2003, 'The nature of high Lx/Lopt sources', 17.56_20190403_1200, European Space Agency, https://doi.org/10.5270/esa-01narjg