Astronomy and Astrophysics, volume 391, 429-440 (2002/8-4)
Mid-infrared observations of the ultraluminous galaxies IRAS 14348-1447, IRAS 19254-7245, and IRAS 23128-5919.
CHARMANDARIS V., LAURENT O., LE FLOC'H E., MIRABEL I.F., SAUVAGE M., MADDEN S.C., GALLAIS P., VIGROUX L. and CESARSKY C.J.
Abstract (from CDS):
We present a study of the three ultraluminous infrared galaxies IRAS 14348-1447, IRAS 19254-7245, and IRAS 23128-5919, based on mid-infrared (MIR) spectro-imaging (5-18µm) observations performed with ISOCAM. We find that the MIR emission from each system, which consists of a pair of interacting late type galaxies, is principally confined to the nuclear regions with diameters of 1-2kpc and can account for more than 95% of their IRAS 12µm flux. In each interacting system, the galaxy hosting an active galactic nucleus (AGN) dominates the total spectrum and shows stronger dust continuum (12-16µm) relative to the Unidentified Infrared Band (UIB) emission (6-9µm), suggestive of its enhanced radiation field. The MIR dominant galaxy also exhibits elevated 15µm/Hα and 15µm/K ratios which trace the high extinction due to the large quantities of molecular gas and dust present in its central regions. Using only diagnostics based on our mid-infrared spectra, we can establish that the Seyfert galaxy IRAS 19254-7245 exhibits MIR spectral features of an AGN while the MIR spectrum of the Seyfert (or LINER) member of IRAS 23128-5919 is characteristic of dust emission principally heated by star forming regions.
galaxies: active - galaxies: individual: IRAS 14348-1447 - galaxies: individual: IRAS 19254-7245 - individual: IRAS 23128-5919 - galaxies: interactions - infrared: galaxies galaxies:
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