8 papers
Cygnus A
A. S. Wilson, K. A. Arnaud, D. A. Smith +2
We report Chandra imaging-spectroscopy and RXTE spectroscopy of the nearby, powerful radio galaxy Cygnus A. Various aspects of the results are discussed, including the X-ray proper…
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…
Chandra X-ray Observations of Cygnus A and Pictor A
A. S. Wilson, A. J. Young, P. L. Shopbell
We describe observations of the two nearest, powerful radio galaxies with the Chandra X-ray Observatory: Cygnus A (z = 0.0562) and Pictor A (z = 0.035). Since the early results fro…
Parsec-Scale Jets and Tori in Seyfert Galaxies
A. L. Roy, J. M. Wrobel, A. S. Wilson +6
What causes the dichotomy between very powerful and very weak radio emission from AGNs? Perhaps the engines are the same but the jets get disrupted by dense ISM in radio-quiet obje…
Slow Jets in Seyfert Galaxies: NGC 1068
A. L. Roy, A. S. Wilson, J. S. Ulvestad +1
We have used the Very Long Baseline Array at 5 GHz to image the nucleus of NGC 1068 at two epochs separated by 2.92 yr. No relative motion was detected between the high brightness-…
Free-Free Absorption on Parsec Scales in Seyfert Galaxies
A. L. Roy, J. S. Ulvestad, A. S. Wilson +5
Seyfert galaxies come in two main types (types 1 and 2) and the difference is probably due to obscuration of the nucleus by a torus of dense molecular material. The inner edge of t…