2005BaltA..14..413K -
Baltic Astronomy, 14, 413-416 (2005/October-0)
"TEMPORARY GPS/HFP" radio sources.
KOVALEV Y.Y.
Abstract (from CDS):
For investigation of the nature of GPS/HFP (`gigahertz peaked-spectrum/ high-frequency peakers', possible young developing radio sources) it is important to construct robust, representative flux-density-limited samples. To look for spectra of the GPS/HFP type, we have used our RATAN-600 instantaneous broad-band 1-22 GHz spectra measurements of about 2000 compact extragalactic radio sources done in 1997-2003. We have found that some objects from published GPS/HFP samples change their spectra in time becoming non-GPS/HFP sources. We call such objects ``temporary GPS/HFP'' and suggest to use them cautiously. GPS/HFP-like type of spectrum can often be produced by an AGN during early stages of strong radio flares, and usually such a spectrum evolves to a flat one. A GPS-type spectrum could also be observed during a quiescent state of a relativistic jet when emission of an extended, slowly variable component of the source dominates. Some new GPS candidates are also found.
Abstract Copyright:
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Journal keyword(s):
galaxies: active, compact - radio continuum: galaxies
Simbad objects:
19
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