منابع مشابه
Radio AGN surveys
Radio surveys play a crucial role in the study of AGN. Searches for AGN at radio wavelengths have several major advantages over other wavelength regimes, including: (i) the radio emission is often extremely powerful, and can be detected out to the highest redshifts (e.g. SDSSp J083643.85+005453.3 at z = 5.82, Fan et al. 2001), (ii) the most powerful radio sources at the highest redshifts pinpoi...
متن کاملRadio Halos in future surveys in the radio continuum
Aims. Giant radio halos are mega-parsec scale synchrotron sources detected in a significant fraction of massive and merging galaxy clusters. Radio halos provide one of the most important pieces of evidence of non-thermal components in large-scale structure. Their statistical properties can be used to discriminate among various models for their origin. Therefore, theoretical predictions of the o...
متن کاملCosmology with Redshift Surveys of Radio Sources
We use the K − z relation for radio galaxies to illustrate why it has proved difficult to obtain definitive cosmological results from studies based entirely on catalogues of the brightest radio sources, e.g. 3C. To improve on this situation we have been undertaking redshift surveys of complete samples drawn from the fainter 6C and 7C radio catalogues. We describe these surveys, and illustrate t...
متن کاملDeep Field Surveys - a Radio View
I present an introductory review text, focusing on recent deep field studies using radio telescopes, including high-resolution, widefield VLBI observations. The nature of the faint radio source population is discussed, taking into account complimentary data and results that are now available via the sub-mm, IR, optical and X-ray wavebands. New developments regarding the increased sensitivity of...
متن کاملImproving efficiency in radio surveys for gravitational lenses
Many lens surveys have hitherto used observations of large samples of background sources to select the small minority which are multiply imaged by lensing galaxies along the line of sight. Recently surveys such as SLACS and OLS have improved the efficiency of surveys by pre-selecting double-redshift systems from SDSS. We explore other ways to improve survey efficiency by optimum use of astromet...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1998
ISSN: 0074-1809
DOI: 10.1017/s0074180900128177