Astronomy & Astrophysics | VOL. 441
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Follow-up near-infrared spectroscopy of ultraluminous infrared galaxies observed by ISO

Publication Date Sep 23, 2005

Abstract

We present low resolution near-infrared spectroscopy of an unbiased sample of 24 ultraluminous infrared galaxies (ULIRGs), selected from samples previously observed spectroscopically in the mid-infrared with the Infrared Space Observatory (ISO). Qualitatively, the near-infrared spectra resemble those of starbursts. Only in one ULIRG, IRAS 04114-5117E, do we find spectroscopic evidence for AGN activity. The spectroscopic classification in the near-infrared is in very good agreement with the mid-infrared one. For a subset of our sample for which extinction corrections can be derived from $\mathrm{Pa\alpha}$and $\mbox{$\mathrm{Br\gamma}$}$, we find rather high $\mathrm{Pa\alpha}$luminosities, in accordance with the powering source of these galaxies being star formation. $\mathrm{[FeII]}$ emission is strong in ULIRGs and may be linked to starburst and superwind activity. Additionally, our sample includes two unusual objects. The first, IRAS F00183-7111, exhibits extreme $\mathrm{[FeII]}$ emission and the second, IRAS F23578-5307, is according to our knowledge one of the most luminous infrared galaxies in $\mbox{$\mathrm{H_2}$}$ rotation-vibration emission.

Concepts
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Ultraluminous Infrared Galaxies
Infrared Space Observatory
IRAS F00183-7111
Unusual Objects
Spectroscopic Classification
Extinction Corrections
Star Formation
Starburst Activity
Good Agreement
Resolution Near-infrared Spectroscopy

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