Spectral Index Studies of Extragalactic Radio Sources
نویسندگان
چکیده
منابع مشابه
Young Extragalactic Radio Sources
Gigahertz Peaked Spectrum (GPS) sources and Compact Symmetric Objects (CSO) are selected in very different ways, but have a significant overlap in properties. Ever since their discovery it has been speculated that they are young objects, but only recently, strong evidence has been provided indicating that GPS sources and CSOs are indeed the young counterparts of large, extended sources. They ar...
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We present an analysis of the spectral properties of the extragalactic radio sources in the nearly complete Very Small Array (VSA) sample at 33 GHz. Data from different surveys are used to study source spectra between 1.4 and 33 GHz. We find that, in general, spectra cannot be well described by a single power law in the range of frequencies considered. In particular, most of the VSA sources tha...
متن کاملDetermination of optical positions for 23 extragalactic radio sources
AB S TRACT The optical counterparts of 23 extragalactic radio sources, of which 13 are in the southern hemisphere, have been observed by three telescopes equipped with CCDs. By reference to the Astrographic/Tycho (ACT) Reference, Carlsberg Meridian (CMC), Positions and Proper Motions (PPM), Hipparcos (HIP) and Lick Northern Proper Motion (NPM) catalogues, the positions of the 23 objects have be...
متن کاملKinematics of Extragalactic Radio Sources A Model for Symmetric Jets
Symmetric extragalactic radio sources exhibit a baffling array of features that are very poorly understood. What is the origin of the remarkable symmetry between the two lobes? Why is the emission in the radio frequency (RF) range? Why are the jets so well collimated, implying long term memory of the core? Why do the core regions emit blue and ultraviolet light? What is the origin of transient ...
متن کاملThe ATCA Intraday Variability Survey of Extragalactic Radio Sources
We present the results of an Australia Telescope Compact Array (ATCA) survey for intra-day variability (IDV) of the total and polarized flux densities of 118 compact, flat spectrum, extragalactic radio sources from the Parkes 2.7 GHz Survey. A total of 22 total flux density IDV sources were discovered and 15 sources were found to show IDV of their polarized flux density. We discuss the statisti...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1977
ISSN: 0074-1809
DOI: 10.1017/s0074180900016089