Speckle imaging of active galactic nuclei: NGC 1068 and NGC 4151
Thesis/Dissertation
·
OSTI ID:6695526
High-resolution images of NGC 1068 and NGC 4151 in the (O III) 5007A line the nearby continuum produced from data taken with the PAPA photon-counting imaging detector using the technique of speckle imaging are presented. The images show an unresolved core of (O III) 5007A emission in the middle of an extended emission region. The extended emission tends to lie alongside the subarcsecond radio structure. In NGC 4151, the extended emission comes from a nearly linear structure extending on both sides of the unresolved core. In NGC 1068, the extended emission is also a linear structure centered on the unresolved core but the emission is concentrated in lobes lying to either side of the major axis. The continuum of NGC 4151 is spatially unresolved. The continuum of NGC 1068 is extended approx.1'' to the SW of the center of the (O III) 5007A emission. Certain aspects of the PAPA detector are discussed, including the variable-threshold discriminators that track the image intensifier pulse height and the camera artifacts. The data processing is described in detail.
- Research Organization:
- Harvard Univ., Cambridge, MA (USA)
- OSTI ID:
- 6695526
- Country of Publication:
- United States
- Language:
- English
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