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Implications of the ISO LWS Spectrum of the Prototypical Ultraluminous Galaxy Arp 220
J. Fischer 1 - S. Satyapal 2 - G. Melnick 3 - P. Cox 4 - J. Cernicharo 5 - M.L. Luhman 1 - G.J. Stacey 6 - H.A. Smith 3 - S.D. Lord 7 - C. Skinner 8 - M.A. Greenhouse 2
1 Naval Research Laboratory, Washington, DC, USA -
2 Goddard Space Flight Center, Greenbelt, MD, USA -
3 Smithsonian Astrophysical Observatory, Cambridge, MA, USA -
4 Institut d'Astronomie Spatiale, Orsay Cedex, France -
5 CSIC/IEM, Madrid, Spain and OAN, A. de Henares, Spain -
6 Cornell University, Ithaca, NY, USA -
7 California Institute of Technology, Pasadena, CA, USA -
8 Space Telescope Science Institute, Baltimore, MD, USA
We present a low resolution (R 
200) far-infrared (43-197 
m) spectrum of the ultraluminous galaxy
Arp 220 obtained from deep, full range scans using the Long Wavelength
Spectrometer (LWS) aboard the Infrared Space Observatory (ISO). The
spectrum is vastly different from the spectra of less luminous
IR bright galaxies: the fine-structure lines that are typical of IR
bright galaxies are weak or absent and the spectrum is dominated by
absorption lines of OH, H2O, CH, NH3 and [O I]. We present our
developing interpretation of the far-infrared spectroscopy and the
continuum distribution and discuss the implications for starburst
versus AGN models.
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Postscript version