A dataset provided by the European Space Agency

Name 030146
Title The X-ray properties of quasar-2s selected from Spitzer.s First Look Survey


DOI https://doi.org/10.5270/esa-jrj6uml
Author Dr Mark Lacy
Description We have identified several dust-obscured quasars in the Spitzer First Look Survey region using a selection based on mid-infrared color. Our selection allows us to directly compare the number density of obscured quasars with those of unobscured quasars from the Sloan survey in the same region of sky, enabling an accurate comparison of the number densities of unobscured, type-1, and obscured, type-2, quasars at a given luminosity for the first time. We request XMM observations in order to estimate the obscuring column of gas towards the nuclei of these objects, and hence establish what fraction of these objects are Compton thick. The results will be important both for understanding the quasar-2 population, and for estimating the fraction of quasars missed in X-ray surveys.
Publication No observations found associated with the current proposal
Instrument EMOS1, EMOS2, EPN, OM, RGS1, RGS2
Temporal Coverage 2006-03-21T20:54:27Z/2006-05-09T00:48:53Z
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 2007-06-01T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2007-06-01T00:00:00Z, 030146, 17.56_20190403_1200. https://doi.org/10.5270/esa-jrj6uml