Observations and a model for the infrared continuum of Centaurus A

D.M. Alexander; A. Efstathiou; J. Hough; D. Aitken; D. Lutz; P.F. Roche; E. Sturm

doi:10.1046/j.1365-8711.1999.02908.x

Observations and a model for the infrared continuum of Centaurus A

D.M. Alexander, A. Efstathiou, J. Hough, D. Aitken, D. Lutz, P.F. Roche, E. Sturm

Centre for Astrophysics Research (CAR)

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Abstract

We present ISOPHOT S, ISOSWS and 8 to 13 mi- cron ground based observations of Centaurus A that show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that in a nuclear sized aperture (~4 arcsec,~60 pc) the SED is characteris- tic of emission from a starburst and AGN torus; in larger apertures an additional component of cirrus emission is required. Based on our model, the torus diameter is estimated to be 3.6 pc and the best fit- ting inclination angle of the torus is 45 degrees. This result has implications for the detectability of tori in low power AGN and in particular for the use of the IRAS 60/25 micron flux ratio as an indicator of the torus inclination.

Original language	English
Pages (from-to)	7886
Journal	Monthly Notices of the Royal Astronomical Society
Volume	310
Issue number	1
DOIs	https://doi.org/10.1046/j.1365-8711.1999.02908.x
Publication status	Published - 1999

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title = "Observations and a model for the infrared continuum of Centaurus A",

abstract = "We present ISOPHOT S, ISOSWS and 8 to 13 mi- cron ground based observations of Centaurus A that show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that in a nuclear sized aperture (~4 arcsec,~60 pc) the SED is characteris- tic of emission from a starburst and AGN torus; in larger apertures an additional component of cirrus emission is required. Based on our model, the torus diameter is estimated to be 3.6 pc and the best fit- ting inclination angle of the torus is 45 degrees. This result has implications for the detectability of tori in low power AGN and in particular for the use of the IRAS 60/25 micron flux ratio as an indicator of the torus inclination.",

author = "D.M. Alexander and A. Efstathiou and J. Hough and D. Aitken and D. Lutz and P.F. Roche and E. Sturm",

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doi = "10.1046/j.1365-8711.1999.02908.x",

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T1 - Observations and a model for the infrared continuum of Centaurus A

AU - Alexander, D.M.

AU - Efstathiou, A.

AU - Hough, J.

AU - Aitken, D.

AU - Lutz, D.

AU - Roche, P.F.

AU - Sturm, E.

N1 - The definitive version is available at www.blackwell-synergy.com. Copyright Blackwell Publishing DOI : 10.1046/j.1365-8711.1999.02908.x

PY - 1999

Y1 - 1999

N2 - We present ISOPHOT S, ISOSWS and 8 to 13 mi- cron ground based observations of Centaurus A that show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that in a nuclear sized aperture (~4 arcsec,~60 pc) the SED is characteris- tic of emission from a starburst and AGN torus; in larger apertures an additional component of cirrus emission is required. Based on our model, the torus diameter is estimated to be 3.6 pc and the best fit- ting inclination angle of the torus is 45 degrees. This result has implications for the detectability of tori in low power AGN and in particular for the use of the IRAS 60/25 micron flux ratio as an indicator of the torus inclination.

AB - We present ISOPHOT S, ISOSWS and 8 to 13 mi- cron ground based observations of Centaurus A that show prominent PAH and silicate features. These and other data are used to construct a model for the infrared continuum. We find that in a nuclear sized aperture (~4 arcsec,~60 pc) the SED is characteris- tic of emission from a starburst and AGN torus; in larger apertures an additional component of cirrus emission is required. Based on our model, the torus diameter is estimated to be 3.6 pc and the best fit- ting inclination angle of the torus is 45 degrees. This result has implications for the detectability of tori in low power AGN and in particular for the use of the IRAS 60/25 micron flux ratio as an indicator of the torus inclination.

U2 - 10.1046/j.1365-8711.1999.02908.x

DO - 10.1046/j.1365-8711.1999.02908.x

M3 - Article

SN - 0035-8711

VL - 310

SP - 7886

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 1

ER -

Observations and a model for the infrared continuum of Centaurus A

Abstract

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