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

fYear

2004

fDate

24-27 Aug. 2004

Firstpage

393

Lastpage

396

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Radio Science Conference, 2004. Proceedings. 2004 Asia-Pacific

Print_ISBN

0-7803-8404-0

Type

conf

DOI

10.1109/APRASC.2004.1422495

Filename

1422495