出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present results from a large global VLBI survey of compact radio sources at 86 GHz begun in
October 2001. The main goal of the survey was to increase the total number of objects accessible
for future 3-mm VLBI imaging by factors of 3 ∼ 5. The survey data attained the baseline sensitivity
of 0.1 Jy, and image sensitivity of better than 10 mJy/beam. To date, a total of 127 compact
radio sources have been observed. The observations have yielded images for 109 sources, and
only 6 sources have not been detected†.
Flux densities and sizes of core and jet components of all
detected sources have been measured using Gaussian model fitting. From these measurements,
brightness temperatures have been estimated, taking into account resolution limits of the data.
Here, we compare the brightness temperatures of the cores and secondary jet components with
similar estimates obtained from surveys at longer wavelengths (e.g. 15GHz). This approach can
be used to study the phenomena related to mechanisms of initial jet acceleration (accelerating or
decelerating sub-pc jets?) and jet composition (electron-positron or electron-proton plasma?).
