Title :
Probing the center of activity in a CSS superluminal source 3C138
Author :
Shen, Z.-Q. ; Cai, H.-B. ; Chen, X. ; Shang, L.-L. ; Jiang, D.-R. ; Chen, Y.-J. ; Kameno, S. ; Hirabayashi, H. ; Liu, X.
Author_Institution :
Shanghai Astronomical Obs., China
Abstract :
We present the results from the first simultaneous multi-frequency (2.3, 5.0, 8.4 and 15 GHz) very long baseline interferometry (VLBI) observations of a compact steep spectrum (CSS) source 3C138, which is a powerful quasar. For the first time, the spectral distribution of the components within its central core region was obtained. This enables us to clearly identify the component at the western end as the location of the nuclear activity. The new measurements further clarify the superluminal motions of its inner jet components.
Keywords :
astronomical spectra; astrophysical jets; quasars; radioastronomical techniques; radiowave interferometry; 2.3 to 15 GHz; VLBI; central core region; compact steep spectrum source; inner jet components; nuclear activity; quasar; simultaneous multi-frequency interferometry observations; spectral distribution; superluminal motions; superluminal source 3C138; very long baseline interferometry; Cascading style sheets; Cotton; Extraterrestrial measurements; Frequency; Interferometry; Nuclear measurements; Observatories; Polarization; RF signals; Sampling methods;
Conference_Titel :
Radio Science Conference, 2004. Proceedings. 2004 Asia-Pacific
Print_ISBN :
0-7803-8404-0
DOI :
10.1109/APRASC.2004.1422495
