3.1 Micron H2O Ice Absorption in LINER-Type Ultraluminous Infrared Galaxies with Cool Far-Infrared Colors: The Centrally Concentrated Nature of Their Deeply Buried Energy Sources

@article{Imanishi200331MH,
  title={3.1 Micron H2O Ice Absorption in LINER-Type Ultraluminous Infrared Galaxies with Cool Far-Infrared Colors: The Centrally Concentrated Nature of Their Deeply Buried Energy Sources},
  author={Masatoshi Imanishi and Philip Richard Maloney},
  journal={The Astrophysical Journal},
  year={2003},
  volume={588},
  pages={165-174}
}
Ground-based 2.8-4.1 ?m slit spectra of the nuclei of seven ultraluminous infrared galaxies (ULIRGs) that are classified optically as LINERs and have cool far-infrared colors are presented. All the nuclei show 3.3 ?m polycyclic aromatic hydrocarbon (PAH) emission, with equivalent widths that are systematically lower than those in starburst galaxies. Strong 3.1 ?m H2O ice absorption, with optical depth greater than 0.6, is also detected in five nuclei, and 3.4 ?m carbonaceous dust absorption is… 

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