English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present images of quasi-simultaneous VLBI observations of theGHz-Peaked-Spectrum radio source OQ 208 with the Very Long Baseline Array at1.4, 1.7, 2.3, 5.0, 8.4, 15.4 GHz and the European VLBI Network at 6.7 GHz. Thelow frequency (1.4, 1.7 and 2.3 GHz) observations reveal a weak and extendedsteep-spectrum component at about 30 mas away in the position angle of $-110^\circ$ which may be a remnant emission. The radio structure of OQ 208consists of two mini-lobes at 5.0, 6.7, 8.4 and 15.4 GHz. Our spectral analysisfurther confirms that the southwest lobe undergoes free-free absorption andfinds that the free-free absorption is stronger in the inner region. By fittingthe 8.4 GHz images from 1994 to 2005, we obtain a separation speed of 0.031$\pm$ 0.006 mas yr$^{-1}$ between the two mini-lobes. This indicates a jetproper motion of 0.105 $\pm$ 0.020 $c$ and a kinematic age of 219 $\pm$ 42 yrfor the radio source.

Seven-frequency VLBI Observations of the GHz-Peaked-Spectrum Source OQ 208