2002A&A...391..429C


Query : 2002A&A...391..429C

2002A&A...391..429C - 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.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual: IRAS 14348-1447 - galaxies: individual: IRAS 19254-7245 - individual: IRAS 23128-5919 - galaxies: interactions - infrared: galaxies galaxies:

Simbad objects: 5

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Number of rows : 5
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 IC 1623 IG 01 07 47.2 -17 30 25   15       ~ 280 1
2 NAME Virgo Cluster ClG 12 26 32.1 +12 43 24           ~ 6250 0
3 LEDA 52270 Sy1 14 37 38.2867288488 -15 00 24.087592692   16.58 16.40     ~ 257 1
4 NAME Super Antennae Sy2 19 31 21.4272801984 -72 39 21.442847832   17.39 16.37 14.65   ~ 284 2
5 ESO 148-2 Sy2 23 15 46.772 -59 03 15.94   14.94 14.73 13.95   ~ 245 1

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2022.05.28-10:27:58

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