Probing large-scale structure with large samples of X-ray selected AGN
نویسندگان
چکیده
منابع مشابه
Large-scale structures in the distribution of X-ray selected AGN
We are searching for large-scale structures in the distribution of AGN discovered by the ROSAT AllSky Survey. The RASS detected > 60000 X-ray objects, of which ≈ 35% are AGN at z < 0.5. The surface density in the extragalactic sky is ≈ 0.5 AGN/deg, which has not been reached until now by any other survey for this redshift range. We efficiently single out the AGN among all the RASS sources using...
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We have analyzed optical spectra of 473 X-ray and 235 optically selected AGNs, to study their emission line properties. We present results of an analysis of the Hβ linewidths. We find that the linewidth distribution of quasars is shifted towards higher velocities (=4300 km s) compared to the distribution of Sy 1s (=3000 km s). There are no Narrow Line Quasars, i.e. there are no AGNs with ...
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I review 1 recent progress in the study of the large-scale structure of the Universe through the distribution of clusters of galaxies, concentrating on new results using X-ray selected samples. After discussing the importance of understanding the properties of the tracers used to map structure and their relation to the underlying mass, I elaborate on the advantages and disadvantages of clusters...
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We outline main arguments in favor of cosmological X-ray surveys of galaxy clusters. We summarize recent advances in our understanding of cluster physics. After a short review of past surveys, we present the scientific motivations of the XMM Large Scale Structure survey. We further illustrate how such a survey can help constrain the nature of the dark energy as well as cluster scaling law evolu...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2014
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201423863