منابع مشابه
Deep 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...
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A 20-hour VLBI observation with the NRAO VLBA and GBT in the NOAO Boötes field reaches an rms noise of 9 microJy per beam at 1.4 GHz. Three sources were detected at 10-milliarcsecond resolution within the GBT primary beam of FWHM 8.6, including the 20milliJy calibrator and two sub-milliJy sources. By tapering the visibility data, portions of the VLBA primary beam of FWHM 29 were imaged at poore...
متن کاملTransient Emissions from Radio-Active Stars: Implications for Wide-field Radio Surveys
Variability is a common characteristic of magnetically active stars. Flaring variability is usually interpreted as the observable consequence of transient magnetic reconnection processes happening in the stellar outer atmosphere. Stellar flares have been observed now across 11 decades in wavelength/frequency/energy; such a large span implies that a range of physical processes takes place during...
متن کاملRadio 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...
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We discuss the constraints set on galaxy evolution by a variety of data from deep extragalactic surveys performed in the mid-IR and far-IR with the Infrared Space Observatory and with millimetric telescopes at longer wavelengths. These observations indicate extremely high rates of evolution for IR galaxies, exceeding those measured for galaxies at other wavelengths and comparable or larger than...
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ژورنال
عنوان ژورنال: EAS Publications Series
سال: 2005
ISSN: 1633-4760,1638-1963
DOI: 10.1051/eas:2005147