Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aspc..340...45t&link_type=abstract
Future Directions in High Resolution Astronomy: The 10th Anniversary of the VLBA, ASP Conference Proceedings, Vol. 340. Edited
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the results of second epoch simultaneous multifrequency observations of 45 sources out of the 55 in the sample of High Frequency Peakers (HFP) by Dallacasa et al. (2000). Seven of the stellar sources (i.e. 16% of the total number of sources and 26% of the stellar fraction) no longer show a convex spectrum and are thus likely to be flat spectrum quasars in an outburst phase during the first epoch of observations. The rest frame peak frequency distribution of HFP quasars extends up to ˜ 45 GHz while that of HFP galaxies is confined to ≤ 17 GHz. Imaging at 1.465 GHz and 1.665 GHz has revealed extended emission for 31% of sources, a substantially larger fraction than found for GPS sources (˜ 10%). In the case of HFP quasars, but not of HFP galaxies, extended emission is associated with strong variability, consistent with a core-jet structure.
Celotti Annalisa
Dallacasa Daniele
de Zotti Gainfranco
Stanghellini Carlo
Tinti Stefano
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