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Mid-infrared observations of the ultraluminous galaxies IRAS14348-1447, IRAS19254-7245, and IRAS23128-5919 | | V. Charmandaris
; O. Laurent
; E. Le Floc’h I.F. Mirabel
; M. Sauvage
; S. Madden
; P. Gallais
; L. Vigroux
; C. J. Cesarsky
; | | Date: |
10 Jun 2002 | | Subject: | astro-ph | | Affiliation: | 2,3), E. Le Floc’h I.F. Mirabel (2,4), M. Sauvage , S. Madden , P. Gallais , L. Vigroux , C. J. Cesarsky ( Cornell Univ., USA, SAp, Saclay, France, MPE, Garching, Germany, Instituto de Astronomia, Buenos Aires, Argentina, ESO, Garching, Ger | | Abstract: | We present a study of the three ultraluminous infrared galaxies IRAS14348-1447, IRAS19254-7245, and IRAS23128-5919, based on mid-infrared (MIR) spectro-imaging (5-18microns) 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 12micron flux. In each interacting system, the galaxy hosting an active galactic nucleus (AGN) dominates the total spectrum and shows stronger dust continuum (12-16microns) relative to the Unidentified Infrared Band (UIB) emission (6-9microns), suggestive of its enhanced radiation field. The MIR dominant galaxy also exhibits elevated 15micron/Halpha and 15micron/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 IRAS19254-7245 exhibits MIR spectral features of an AGN while the MIR spectrum of the Seyfert (or LINER) member of IRAS23128-5919 is characteristic of dust emission principally heated by star forming regions. | | Source: | arXiv, astro-ph/0206150 | | Services: | Forum | Review | PDF | Favorites | |
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