Infrared imaging and polarimetry observations of the obscured nucleus of Centaurus A

Details Infrared imaging and polarimetry observations of the obscured nucleus of Centaurus A Infrared imaging and polarimetry observations of the obscured nucleus of Centaurus A

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7267s&link_type=abstract

HST Proposal ID #7267

Computer Science

Hst Proposal Id #7267 Agn/Quasars

Scientific paper

We propose to obtain infrared imaging polarimetry, broad and narrow band imaging of the nuclear regions of Centaurus A. This project complements and extends the studies we performed with HST in the optical bands and in the IR with ground based data. In optical images the dust lane dominates both the morphology and the polarization properties and it appears that the active nucleus is completely hidden from our view. The reduced extinction and efficiency of the dichroic polarization of the dust in the infrared allows us a much clearer view of the innermost regions of Cen A, with our ground based IR polarimetry showing the existence of a highly polarized nucleus. However, the nature of the nucleus remains unclear. The HST polarization observations will determine whether the IR polarization is associated with an extended scattering region, for which we would expect to see a resolved centro- symmetic polarization pattern or with a mis-directed BL Lac nucleus{jet?}. We will also explore the geometry and structure of the emission line region, in particular its relationship with the jet. A search for synchrotron emission off-nucleus associated with the X-ray/radio jet will be performed. A secondary goal of the observations will be to provide significantly better data about the globular cluster population of NGC 5128. The proposed parallel WF/PC-2 observations will allow us to measure the sizes, colors, and shapes of 400 globular clusters.

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