منابع مشابه
Deep Extragalactic X-ray Surveys
Deep surveys of the cosmic X-ray background are reviewed in the context of observational progress enabled by the Chandra X-ray Observatory and the X-ray Multi-Mirror Mission-Newton. The sources found by deep surveys are described along with their redshift and luminosity distributions, and the effectiveness of such surveys at selecting active galactic nuclei (AGN) is assessed. Some key results f...
متن کاملSurveys of Extragalactic Sources with Planck
Although the primary goal of ESA’s Planck mission is to produce high resolution maps of the temperature and polarization anisotropies of the Cosmic Microwave Background (CMB), its high-sensitivity all-sky surveys of extragalactic sources at 9 frequencies in the range 30–860 GHz will constitute a major aspect of its science products. In particular, Planck surveys will provide key information on ...
متن کاملGravitational lensing statistics with extragalactic surveys
We present constraints on the cosmological constant λ0 and the density parameter Ω0 from joint constraints from the analyses of gravitational lensing statistics of the Jodrell Bank-VLA Astrometric Survey (JVAS), optical gravitational lens surveys from the literature and CMB anisotropies. This is the first time that quantitative joint constraints involving lensing statistics and CMB anisotropies...
متن کاملHI Surveys with FAST and ASKAP
Surveys of galaxies in the 21-cm line of neutral hydrogen are important parts of the science case for the Five-hundred-metre Aperture Spherical Telescope (FAST) and the Australian SKA Pathfinder (ASKAP). The FAST strawman design with 19 beams and low system temperature allows a “survey speed” comparable to that of ASKAP. The combination of the two telescopes will allow a shallow all-sky survey ...
متن کاملResolution and confusion in ASKAP HI Surveys
In order to resolve a galaxy detected in an HI survey from its neighbours, and in order to allow accurate optical/IR identification, good resolution is required. However, in order to detect a galaxy in the first place, there needs to be a reasonable match between the array resolution and the angular diameter of the galaxy. Too much resolution will make the galaxy undetectable. By considering si...
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ژورنال
عنوان ژورنال: The Astronomy and Astrophysics Review
سال: 2015
ISSN: 0935-4956,1432-0754
DOI: 10.1007/s00159-015-0085-3