11 papers
VSOP Observations of the EGRET Blazar 1633+382
C. C. Cheung, J. S. Ulvestad, W. T. Vestrand +1
Two high-resolution 5 GHz VSOP+VLBA images of the blazar 1633+382 reveal clear morphological change in both the bright inner east-west jet, and in the more diffuse structure furthe…
VLBI Imaging of Seyfert Galaxies
James S. Ulvestad
The advent of the Very Long Baseline Array and its phase-referencing capability have enabled milliarcsecond-scale imaging of radio sources at sub-millijansky sensitivity, opening t…
Gigahertz-Peaked Spectrum Radio Sources in Nearby Galaxies
N. M. Nagar, A. S. Wilson, H. Falcke +2
There is now strong evidence that many low-luminosity AGNs (LLAGNs) contain accreting massive black holes and that the nuclear radio emission is dominated by parsec-scale jets laun…
Testing the Unified Model with an Infrared Selected Sample of Seyferts
H. R. Schmitt, J. S. Ulvestad, R. R. J. Antonucci +3
We present a series of statistical tests using homogeneous data and measurements for a sample of Seyfert galaxies. These galaxies were selected from mostly isotropic properties, th…
The Importance of Shocks in the Ionization of the Narrow Line Region of Seyferts
H. R. Schmitt, A. L. Kinney, J. B. Hutchings +2
We discuss the viability of shocks as the principal source of ionization for the Narrow Line Region of Seyfert galaxies. We present the preliminary results of [OIII]5007A and radio…
A Flaring Megamaser in Mrk 348
A. B. Peck, H. Falcke, C. Henkel +4
We report new observations of the H2O megamaser in the Seyfert 2 galaxy Mrk 348. Following our initial detection in 2000 March using the Effelsberg 100 m telescope, re-analysis of…