ISO Long-Wavelength Photometry of Starburst Galaxies

Details ISO Long-Wavelength Photometry of Starburst Galaxies ISO Long-Wavelength Photometry of Starburst Galaxies

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.8501c&link_type=abstract

American Astronomical Society, 192nd AAS Meeting, #85.01; Bulletin of the American Astronomical Society, Vol. 30, p.1158

Astronomy and Astrophysics

Astronomy

Scientific paper

We present far-infrared (FIR) observations of the starburst galaxies IC1586, NGC5860, NGC6090, NGC7673, and TOL1924-416 obtained with ISOPHOT and the C200 135 and 200 filters, centered at 150mu m and 200mu m. Although the ISOPHOT calibrations are not definitive yet, using IRAS data in conjunction with our ISO photometry we find that the long-wavelength (cool dust) contribution to the FIR emission of starbursts is larger than previously assumed. The extrapolation of our data to the 8-1000mu m range produce total FIR luminosities which are a factor ~ 2 larger than previously derived from the extrapolation of the IRAS data only. With a two-temperature blackbody fit, the warm dust component has typical temperatures ~ 50-60 K, and the cool dust component has temperatures ~ 20-25 K. The ratio between the masses of the cool component to the warm component is a factor ~ 200--400. We also present multiwavelength spectral energy distributions for the 5 galaxies in the range 0.12-240mu m, using IUE, ground-based optical, and the IRAS+ISO data. We attempt preliminary analysis of the energy balance between the stellar energy absorbed by dust in the UV-optical range and the energy re-radiated by the dust in the far-infrared.

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