Radio Observations of Nearby HST BL Lacs

Details Radio Observations of Nearby HST BL Lacs Radio Observations of Nearby HST BL Lacs

2003-09-15

arxiv.org/abs/astro-ph/0309380v1

Astronomy and Astrophysics

Astrophysics

5 pages, 4 .eps figures. To appear in ASP Conference Series: "Future Directions in High Resolution Astronomy: A Celebration of

Scientific paper

We present a radio/optical study of a sample of BL Lac objects at arcsecond and milliarcsecond resolution. The sample consists of 30 nearby (z<0.2) BL Lacs, mostly X-ray selected. These nearby objects are weak in the radio, yet we have successfully observed them with the VLA, VLBA and EVN, revealing interesting morphologies. Most importantly, we find evidence of relativistic boosting even in these low power sources (dominant core, one-sided jets). We present a radio/optical comparison including HST observations which have detected compact optical cores in all objects.

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