Snapshot VLBI mapping at 92 cm of 16 low frequency variable extragalactic sources

Session 75 -- VLBI Obsesrvations
Display presentation, Friday, January 14, 9:30-6:45, Salons I/II Room (Crystal Gateway)

[75.09] Snapshot VLBI mapping at 92 cm of 16 low frequency variable extragalactic sources

J. E. Carson (MIT), D. R. Altschuler (NAIC), L. I. Gurvits (NAIC and Lebedev Phys. Inst.), W. Alef, D.\~Graham (MPIfR), B. Dennison (Virginia Tech.), A. S. Trotter (Harvard Univ.)

We present the results of VLBI mapping at 92 cm of 16 of the most "active" sources from the Arecibo -- NRAO low frequency variability monitoring program. Typical resolution of the maps is a few centiarcseconds, and typical dynamical range is $(50 - 100):1$. Following is a list of the sources:

\begin{center} \begin{tabular}{llll} \hline 0116+319 & 0735+178 & 1422+202 & 2050+363 \\ 0235+164 & 0851+202 & 1611+343 & 2145+067 \\ 0333+321 & 1055+018 & 1633+382 & 2230+114 \\ 0723$-$008 & 1117+146 & 1901+319 & 2251+158 \\ \hline \end{tabular} \end{center}

We note that the data show clear evidence of significant scattering at baselines of 2 -- 6 M$\lambda$ and longer. Examination of structural information will enable us to: \\ $\bullet$ study the dependence of variability on source size \\ $\bullet$ choose the most relevant sources for further studies at different frequencies and with higher dynamical range.

JEC and AST acknowledge, with thanks, the REU Summer Student program support. We are grateful for the support of the European and US VLBI networks. NAIC is operated by Cornell University under a cooperative agreement with the National Science Foundation.

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