Gemini Observations of Mid-IR Emission from the Nucleus of Centaurus A

Details Gemini Observations of Mid-IR Emission from the Nucleus of Centaurus A Gemini Observations of Mid-IR Emission from the Nucleus of Centaurus A

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20914911r&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #149.11; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present high spatial resolution mid-IR images of the nuclear region of NGC 5128 (Centaurus A). Images were obtained at 8.8μm, N-band (10.5 μm) and 18.3 μm using the mid-IR imager/spectrometer T-ReCS on Gemini South. These images show a bright unresolved core surrounded by low-level extended emission.
We place an upper limit to the size of the unresolved nucleus of 3.1 pc (0.185”) at 8.8μm and 3.4 pc (0.205”) at 18.3μm at the level of the FWHM. The most likely source of nuclear mid-IR emission is from a dusty torus with some contribution from synchrotron emission associated with the jet as well as relatively minor starburst activity. Clumpy tori models are presented which predict the mid-IR size of this torus to be no larger than 0.05” (0.85pc). Surrounding the nucleus is extensive low-level mid-IR. Seen by ISO and Spitzer, this paper presents to date the highest spatial resolution mid-IR images of this extended near nuclear structure. Much of the emission is
coincident with Pa-α sources seen by HST implying emission from star forming areas, however evidence for shock heating, synchrotron emission from the jet, a nuclear bar/ring, and a dusty narrow emission line region is also discussed.

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