Other
Scientific paper
May 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...182.4402w&link_type=abstract
American Astronomical Society, 182nd AAS Meeting, #44.02; Bulletin of the American Astronomical Society, Vol. 25, p.868
Other
Scientific paper
We have measured the depth of the 2.3 microns CO absorption bands in 19 high luminosity galaxies selected from the IRAS catalog. We used the CGAS spectrometer on the IRTF with a beamsize of 2.7 arcsec and a spectral resolution of 120. Our main result is that we find a relationship between the depth of the CO absorption and the H - K color of a galaxy. Specifically: Galaxies with H - K colors in the range 0.25 to 0.6 have a deeper CO absorption than normal galaxies, which have H-K colors of less than 0.25. Their near infrared emission is probably dominated by late-type supergiants which have been reddened by interstellar dust. Galaxies with H - K colors redder than 0.7 have much weaker than normal CO absorption. Their near-infrared emission must therefore be dominated by something other than starlight. Of the five objects with the reddest H - K colors, three are ultraluminous galaxies and two are off-nuclear components of the interacting system Arp 299.
Becklin Eric E.
Ridgway Susan E.
Wynn-Williams C. G.
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