IRS mapping of the 500 pc nuclear dust shell in Centaurus A

Details IRS mapping of the 500 pc nuclear dust shell in Centaurus A IRS mapping of the 500 pc nuclear dust shell in Centaurus A

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30272h&link_type=abstract

Spitzer Proposal ID #30272

Computer Science

Scientific paper

We propose to map the central 1.5' of Centaurus A with IRS. This region covers a recently discovered 500pc bipolar shell. This shell, if confirmed, could be the only extragalactic nuclear shell with a mid-infrared counter part. Hence Centaurus A represents a unique laboratory to test scenarios and models of feedback from an AGN or/and circumnuclear star formation on the ISM near the nucleus. By comparing the IRS spectra of the shell component with the star forming parallelogram shaped region corresponding to the warped disk, we will seek confirmation that the shell is a separate and coherent structure, and better estimate its dust temperature and so mass. Derived constraints on its energetics will form the basis of subsequent models accounting for its formation. We will search for evidence of shocks in the shell due to its expansion and where the jets pass through it. As the shell covers all solid angles from the nuclear black hole, the IRS spectra will also be used to search for angular variations in the ambient UV radiation field.

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