Phase-Reference VLBI Observations of the Compact Steep-Spectrum Source 3C 138
نویسندگان
چکیده
منابع مشابه
Astronomy and Astrophysics Superluminal Motion in a Compact Steep Spectrum Radio Source 3c 138
We present the results of 5 GHz VLBI observations of a compact steep spectrum source 3C 138. The data are consistent with the western end being the location of the central activity. The observed offset between different frequencies in the central region of 3C 138 can be accounted for by a frequency dependent shift of the synchrotron self-absorbed core. Our new measurements confirm the existence...
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A small sample of 7 southern Compact Steep Spectrum (CSS) radio sources has been selected as part of the study of a larger flux-limited complete sample of radio sources. High resolution images, using the VLBI network in the southern hemisphere and the high resolution MERLIN array, are presented for all sources in the CSS sample. The overall morphology of each source consists of well-defined dou...
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Context. According to a generally accepted paradigm, small intrinsic sizes of Compact Steep Spectrum (CSS) radio sources are a direct consequence of their youth, but in later stages of their evolution they are believed to become large-scale sources. However, this notion was established mainly for strong CSS sources. Aims. In this series of papers we test this paradigm on 60 weaker objects selec...
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We present LOFAR Low Band observations of the Boötes and 3C 295 fields. Our images made at 34, 46, and 62 MHz reach noise levels of 12, 8, and 5 mJy beam−1, making them the deepest images ever obtained in this frequency range. In total, we detect between 300 and 400 sources in each of these images, covering an area of 17 to 52 deg. From the observations we derive Euclidean-normalized differenti...
متن کاملLOFAR Low-Band antenna observations of the 3C 295 and Botes fields: source counts and ultra-steep spectrum sources
We present LOFAR Low Band observations of the Boötes and 3C 295 fields. Our images made at 34, 46, and 62 MHz reach noise levels of 12, 8, and 5 mJy beam−1, making them the deepest images ever obtained in this frequency range. In total, we detect between 300 and 400 sources in each of these images, covering an area of 17 to 52 deg. From the observations we derive Euclidean-normalized differenti...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Japan
سال: 2006
ISSN: 0004-6264,2053-051X
DOI: 10.1093/pasj/58.6.1033