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