VLBI Observations of Southern EGRET Identifications. II. VLBA Observations and the Importance of Jet Bending in Gamma-Ray Sources

Details VLBI Observations of Southern EGRET Identifications. II. VLBA Observations and the Importance of Jet Bending in Gamma-Ray Sources VLBI Observations of Southern EGRET Identifications. II. VLBA Observations and the Importance of Jet Bending in Gamma-Ray Sources

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...500..673t&link_type=abstract

Astrophysical Journal v.500, p.673

Astronomy and Astrophysics

Astronomy

29

Galaxies: Active, Galaxies: Jets, Gamma Rays: Observations, Techniques: Interferometric

Scientific paper

We present VLBI images of six southern hemisphere radio sources that have been identified by EGRET as sources of greater-than-100 MeV gamma-ray emission, PKS 0521-365, PKS 1127-145, PKS 1622-253, PKS 1622-297, PKS 1730-130, and PKS 1908-201. We quantitatively investigate the suggestion of von Montigny et al. that jet bending may be a significant factor affecting the gamma-ray identification of radio-loud flat-spectrum active galactic nuclei (AGNs), using samples of EGRET-identified and gamma-ray-quiet radio sources. From this investigation, we find evidence to suggest that jet bending properties, as observed in parsec-scale radio jets, are correlated with gamma-ray identification for this class of source. The parsec-scale jets in gamma-ray-quiet AGNs appear to have more and larger bends than do the parsec-scale jets in EGRET-identified AGNs. Caution should be exercised when interpreting these results, however, since we point out that significant, but difficult to quantify, observational biases may also be at work in these samples.

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