VLBI observations of a sample of 15 EGRET-detected AGNs at 5 GHz

Details VLBI observations of a sample of 15 EGRET-detected AGNs at 5 GHz VLBI observations of a sample of 15 EGRET-detected AGNs at 5 GHz

Jan 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001iaus..205..116h&link_type=abstract

Galaxies and their Constituents at the Highest Angular Resolutions, Proceedings of IAU Symposium #205, held 15-18 August 2000 at

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Gamma ray emission of active galactic nuclei (AGNs) is one of strongest energy sources in universe. 66 AGNs have been detected by EGRET with high-confidence. Some of them lacked enough radio observations. We observed a sample of 15 EGRET-detected AGNs which lacked sufficient radio data using Europe VLBI Networt (EVN) at 5 GHz. The VLBI results were presented in this paper. 11 of them displayed clear core jet structures and the remains exhibited single component. The images were used to measure the position angles of the jet at pc scales and, together with literature data both at pc and kpc scales, to investigate position differences (Δ PA) between kpc- and pc-scales structures of EGRET-detected AGNs. The result is consistent with our previous one that γ ray quasars have high alignment of radio jets, while γ-ray BL lac objects have large Δ PA. The astrophysical interpretation of the results are discussed.

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