Parsec-scale morphology and spectral-index distribution in faint high-frequency peakers
نویسندگان
چکیده
منابع مشابه
The radio source OQ208: parsec-scale morphology and spectral properties
We present results from global VLBI (Very Long Baseline Interferometry) observations at 5 GHz of the radio source OQ208. The milliarcsecond (mas) morphology of the radio emission is described by an asymmetric compact double structure with a flux density ratio between the two components of about 10:1, and a projected total size of ∼ 7 mas (i.e. ∼ 7 pc). Both components are resolved by the presen...
متن کاملHigh Frequency Peakers
There is quite a clear anticorrelation between the intrinsic peak frequency and the overall radio source size in Compact Steep Spectrum (CSS) and GHz Peaked Spectrum (GPS) radio sources as shown by O’Dea (1998). This feature is interpreted in terms of synchrotron self-absorption (although free-free absorption may play a role as well) of the radiation emitted by a small radio source which is gro...
متن کاملOptical identifications of High Frequency Peakers⋆
Abstract. We present CCD observations of 13 objects from a complete sample of 55 bright High Frequency Peaker (HFP) radio sources, and provide optical identification for 12 of them. Images in R and V filters have been used to derive some additional information concerning the host of the radio source. Three hosts are likely to be galaxies, one resulted slightly extended, while the remaining 8 ar...
متن کاملVLBA images of High Frequency Peakers
We propose a morphological classification based on the parsec scale structure of fifty-one High Frequency Peakers (HFPs) from the “bright” HFP sample. VLBA images at two adjacent frequencies (chosen among 8.4, 15.3, 22.2 and 43.2 GHz) have been used to investigate the morphological properties of the HFPs in the optically thin part of their spectrum. We confirm that there is quite a clear distin...
متن کاملAND ASTROPHYSICS High Frequency Peakers : I . The Bright Sample
Here we present a sample of sources with convex radio spectra peaking at frequencies above a few GHz. We call these radio sources High Frequency Peakers (HFPs). This sample extends to higher turnover frequencies than the samples of Compact Steep Spectrum (CSS) and GHz Peaked Spectrum (GPS) radio sources. HFPs are rare due to the strong bias against them caused by their turnover occurring at fre...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2012
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2012.21226.x