NICMOS Imaging of the Dusty CfA Seyfert Nuclei

Details NICMOS Imaging of the Dusty CfA Seyfert Nuclei NICMOS Imaging of the Dusty CfA Seyfert Nuclei

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7867p&link_type=abstract

HST Proposal ID #7867

Physics

Hst Proposal Id #7867 Agn And Quasars

Scientific paper

Are the differences between Seyfert 1s and 2s due to orientation of the central source relative to our line of sight {the Unified Models}, or are do they represent different evolutionary states of AGNs? WFPC2 images of 40 Seyfert galaxies found by the CfA Redshift Survey reveal a striking difference between the general appearances of Seyfert 1s and Seyfert 2s at subarcsecond scales. On one hand, this is roughly consistent with the expectations of the Unified picture: the Seyfert 1 nuclei are all very bright and saturated, while the Seyfert 2s are considerably fainter. However, many of the Seyfert 2s have nuclei clearly being obscured by circumnuclear dust on 100 pc scales in the host galaxies. Are strongly stellar Seyfert 1 nuclei lurking behind these dust lanes? Or are they dusty because they are recently formed/rejuvenated, as suggested by the evolutionary picture? We propose to obtain J and H-band NICMOS Camera 1 images of the dusty Seyfert 2s in the CfA sample to resolve this issue. Combined with archival WFPC2 images, the VJH colors can be used to derive the total line-of-sight extinction {measuring the amount of cold interstellar material in the circumnuclear regions} and trace changes in the stellar population. These data will allow us to determine if the Seyfert 1/2 dichotomy is best explained by the unified model, the evolutionary picture, or a combination of both of these scenarios.

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