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VLBA Imaging of Central Engines in Radio Quiet Quasars
James S. Ulvestad, Robert R. J. Antonucci, Richard Barvainis
We have used the Very Long Baseline Array (VLBA) to image five radio-quiet quasars (RQQs) at milliarcsecond resolution, at frequencies between 1.4 and 5 GHz. These quasars have typ…
The Core of NGC 6240 from Keck Adaptive Optics and HST NICMOS Observations
C. E. Max, G. Canalizo, B. A. Macintosh +4
We present results of near infrared imaging of the disk-galaxy-merger NGC 6240 using adaptive optics on the Keck II Telescope and reprocessed archival data from NICMOS on the Hubbl…
Revealing AGN by Polarimetry
Makoto Kishimoto, Robert Antonucci, Catherine Boisson +1
Polarimetric study in the UV and optical has been one of the keys to reveal the structure and nature of active galactic nuclei (AGN). Combined with the HST's high spatial resolutio…
The buried Balmer-edge signatures from quasars
Makoto Kishimoto, Robert Antonucci, Catherine Boisson +1
In our previous paper, we have reported the detection of a Balmer edge absorption feature in the polarized flux of one quasar (Ton 202). We have now found similar Balmer edge featu…
Penetrating Dust Tori in AGN
Gabriela Canalizo, Claire Max, Robert Antonucci +3
We present preliminary results from high resolution (~ 0.05") adaptive optics observations of Cygnus A. The images show a bi-conic structure strongly suggestive of an obscuring tor…
Accretion around supermassive black holes: the detection of the Balmer edge signature from quasars
Makoto Kishimoto, Robert Antonucci, Catherine Boisson +1
The ultraviolet/optical continuum of quasars is thought to be from an accretion flow around a supermassive black hole, and it dominates the radiative output of quasars. However, th…