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| Paper: |
HALCA Observation Results and Implications for VSOP-2 Observations of Blazars |
| Volume: |
402, Approaching Micro-Arcsecond Resolution with VSOP-2: Astrophysics and Technologies |
| Page: |
135 |
| Authors: |
Wajima, K. |
| Abstract: |
We have performed Space VLBI observations of six blazars which have been detected gamma-ray emissions by EGRET. All sources have very compact core-dominant structures and three sources have a brightness temperature greater than 1012 K. We could also determine the jet viewing angle for some of sources and the they have smaller viewing angles of typically less than 5°. We also made short-term variability observations of PKS 1622−297 with the ATCA to investigate compactness of the source. The intraday variability feature at both 4.8 and 8.6 GHz was detected for this source and estimated scattering disk sizes from those results were a few hundred μas, and corresponds to a linear scale of about 1017 cm, which is similar to a size obtained from a theoretical model that assumes the external radiation Compton model can account for the gamma-ray emission. Although these results support the inverse Compton model of the gamma-ray emission from blazars, we could not conclusively determine the mechanism because of insufficient angular resolution by the first Space VLBI mission. Thus, VSOP-2 will be a powerful tool for revealing their energetics and gamma-ray emission mechanisms because of its high angular resolution capability. We present HALCA observation results and summarize some scientific idea with VSOP-2 observation of blazars. |
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