The NEP ROSAT Survey
نویسندگان
چکیده
منابع مشابه
A Cluster Deficit in the ROSAT NEP Survey
We have used data from the deepest region of the ROSAT All−Sky Survey, the North Ecliptic Pole (NEP) region, to produce a complete and unbiased X−ray selected sample of distant clusters to understand the nature of cluster evolution and determine implications for large scale structure models. In this contribution results are presented from a comparison between the number of the observed clusters...
متن کاملThe soft X - ray Cluster - AGN spatial cross - correlation function in the ROSAT - NEP survey
Context. X-ray surveys facilitate investigations of the environment of AGNs. Deep Chandra observations revealed that the AGNs source surface density rises near clusters of galaxies. The natural extension of these works is the measurement of spatial clustering of AGNs around clusters and the investigation of relative biasing between active galactic nuclei and galaxies near clusters. Aims. The ma...
متن کاملRXJ 1821.6+6827: a Cool Cluster at z=0.81 from the ROSAT NEP Survey
We present an analysis of the properties of the cluster of galaxies RXJ1821.6+6827, or NEP5281, at a redshift z=0.816±0.001. RXJ1821.6+6827 was discovered during the optical identification of the X-ray sources in the North Ecliptic Pole (NEP) region of the ROSAT All-Sky Survey and it is the highest redshift cluster of galaxies of the NEP survey. We have measured spectroscopic redshifts for twen...
متن کاملThe ROSAT Deep Survey
An unusual double-lobed extended X-ray source (RX J105343+5735) is detected in the ROSAT ultra-deep HRI image of the Lockman Hole. The angular size of the source is 1.7× 0.7 arcmin and its X-ray flux is 2 × 10 erg cm s. R-band imaging from the Keck telescope revealed a marginal excess of galaxies brighter than R=24.5, but Keck LRIS spectroscopy of 24 objects around the X-ray centroid did not yi...
متن کاملA milestone to SPICA extragalactic surveys: The AKARI NEP survey
Large area surveys in the infrared wavelengths have revealed a significant evolution of the star formation activity of the universe in the past. The extragalactic survey we have conduced with AKARI towards the north ecliptic pole (NEP) is unique, in terms of a comprehensive wavelength coverage from 2 to 24 micron using all 9 photometric bands of the Infrared Camera (IRC). We demonstrate that th...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1998
ISSN: 0074-1809
DOI: 10.1017/s0074180900116079