出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：The true nature of Low-Power Compact (LPC) radio sources is not well understood. They have
similar power as FR I radio galaxies but smaller linear sizes. In this contribution, we exploit
phase-referenced VLBI images of five such sources to discuss the properties of their nuclear
regions, as well as 8- and 22-GHz VLA data to resolve the sub-arcsecond-scale resolution structures.
Our data reveal flat-spectrum, compact cores (down to a few mJy level) in four of the five
sources and the absolute astrometry provided by the phase referencing allows us to identify the
centre of activity in the VLA images. Based on our results, we rule out the presence of strong
relativistic effects in these LPCs, so they must be intrinsically small and possibly frustrated or
short lived. Fits of continuous injection models yield spectral ages in the range 105−107 yrs.
