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| DOI | 10.1086/587771 | ||||
| Año | 2008 | ||||
| Tipo | artículo de investigación |
Citas Totales
Autores Afiliación Chile
Instituciones Chile
% Participación
Internacional
Autores
Afiliación Extranjera
Instituciones
Extranjeras
We present high spatial resolution mid-IR images of the nuclear region of NGC 5128 (Centaurus A). Images were obtained at 8.8 mu m, N band ( 10.4 mu m), and 18.3 mu m 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 3.2 pc ( 0.19 '') at 8.8 mu m and 3.5 pc ( 0.21 '') at 18.3 mu m at the level of the FWHM. The most likely source of nuclear mid-IR emission is from a dusty torus and possibly a dusty narrow-line region 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 '' (0.85 pc). Surrounding the nucleus is extensive low-level mid-IR emission. This paper presents to date the highest spatial resolution mid-IR images of this extended near nuclear structure, previously observed by ISO and Spitzer. Much of the emission is coincident with Pa alpha sources seen by HST implying emission from star-forming areas; however, evidence for jet-induced star formation, synchrotron emission from the jet, a nuclear bar/ring, and an extended dusty narrow emission line region is also discussed.
| Ord. | Autor | Género | Institución - País |
|---|---|---|---|
| 1 | Radomski, James T. | Hombre |
Observatorio Gemini - Chile
Gemini ObservatorySouthern Operations Center - Chile |
| 2 | Packham, C. | Hombre |
UNIV FLORIDA - Estados Unidos
University of Florida - Estados Unidos |
| 3 | Levenson, Nancy A. | Mujer |
UNIV KENTUCKY - Estados Unidos
University of Kentucky - Estados Unidos |
| 4 | Perlman, Eric S. | Hombre |
Univ Maryland Baltimore Cty - Estados Unidos
University of Maryland, Baltimore County - Estados Unidos University of Maryland, Baltimore County (UMBC) - Estados Unidos |
| 5 | Leeuw, Lerothodi L. | - |
Rhodes Univ - República de Sudáfrica
Rhodes University - República de Sudáfrica |
| 6 | Matthews, Henry | Hombre |
Natl Res Council Canada - Canadá
National Research Council Canada - Canadá |
| 7 | Mason, R. | - |
Observatorio Gemini - Estados Unidos
|
| 8 | De Buizer, James M. | Hombre |
Observatorio Gemini - Chile
Gemini ObservatorySouthern Operations Center - Chile |
| 9 | Telesco, C. | Hombre |
UNIV FLORIDA - Estados Unidos
University of Florida - Estados Unidos |
| 10 | Orduna, Manuel | Hombre |
UNIV FLORIDA - Estados Unidos
University of Florida - Estados Unidos |