Sub-milliarcsecond radio structure of three quasars

Su, Bu-MeiYunnan Observatory, Chinese Academy of Sciences, 650011, Kunming, China (författare)

A translation of Acta Astrophys. Sin. Vol. 20, No. 4 349-354, 2000
The quasars, 0420-014, 0748+126 and 2251+158 (3C 454.3), have been observed at 1.3 cm with a global VLBI network. We have obtained the hybrid maps of the quasars at sub-milliarcsecond resolution. The brightness distribution is revealed in their nuclear regions. The observed data are fitted with a small number of Gaussian components. 2251+158 shows a core-jet structure, and its nuclear region is elongated in the direction PA= -130o. The jet is curved. Its observations at the epoch 1992.9 show it to be in the course of a large burst, accompanied by several smaller ones. The strongest component has a flux of ~ 4.11 Jy (67% of the total detected flux), mostly from an area of 0.16 x 0.01 mas. Doppler boosting is probably responsible for raising the brightness temperature up to 2.6 x 1012 K.

Li, Yong-ShengYunnan Observatory, Chinese Academy of Sciences, 650011, Kunming, China (författare)
Bååth, Lars B.Högskolan i Halmstad,Maskinteknisk produktframtagning (MTEK)(Swepub:hh)baath (författare)
Gao, Yi-FeiYunnan Observatory, Chinese Academy of Sciences, 650011, Kunming, China (författare)
Yunnan Observatory, Chinese Academy of Sciences, 650011, Kunming, ChinaMaskinteknisk produktframtagning (MTEK) (creator_code:org_t)

Ingår i:Chinese Astronomy and Astrophysics: Elsevier25:1, s. 23-280275-10621879-128X

Av författaren/redakt...: Su, Bu-Mei; Li, Yong-Sheng; Bååth, Lars B.; Gao, Yi-Fei

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