Mathematics – Logic
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7328m&link_type=abstract
HST Proposal ID #7328
Mathematics
Logic
Hst Proposal Id #7328 Agn/Quasars
Scientific paper
We propose a Snapshot Infrared Imaging Survey {IRIS} of the centers of the nearest active galaxies at a resolution of 20 pc. Observing in the near-IR minimizes the dust obscuration and maximizes sensitivity to the old stellar population which dominates the mass. Imaging with the NICMOS-1 camera is the best way to determine reliably the frequency in Seyfert 1's and 2's of: nuclear gas disks and rings, bipolar outflows, jets, collisions and mergers, bars and other asymmetries, and nuclear starbursts. We will analyze these high resolution nuclear images jointly with our extensive visible/IR/radio ground-based observations of the same objects. We will also compare these IRIS Snapshots with NICMOS images of a control sample of the nearby normal galactic nuclei which is carefully matched in redshift, morphological type, total magnitude, isophotal diameter and inclination. This will identify which peculiar nuclear structures are associated with nonstellar activity, which are associated with starbursts, and which are found equally often in all galaxies. We will determine if the Sy 1 and Sy 2 galaxies are similar in all orientation-independent morphological characteristics, as predicted by Unified Schemes. Potential targets are the 106 nearest {z < 0.019} active galaxies which are not being imaged in other NICMOS programs. Excellent SNRs in the inner regions of the galaxies will be obtained in 400 - 500 second exposures with F160W. We will release the images within 90 days of receiving them.
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