The blueshifted PA alpha broad line component and the origin of strong iron emission in the ultraluminous infrared galaxy IRAS 07598+6508

Details The blueshifted PA alpha broad line component and the origin of strong iron emission in the ultraluminous infrared galaxy IRAS 07598+6508 The blueshifted PA alpha broad line component and the origin of strong iron emission in the ultraluminous infrared galaxy IRAS 07598+6508

May 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.1668t&link_type=abstract

The Astronomical Journal, vol. 107, no. 5, p. 1668-1674

Astronomy and Astrophysics

Astronomy

7

Active Galactic Nuclei, Galaxies, Infrared Astronomy, Iron, Light Emission, Line Shape, Line Spectra, Luminosity, Protactinium, Color-Color Diagram, Cryogenic Equipment, Data Reduction, Gratings (Spectra), Infrared Detectors, Spectrographs, Telescopes

Scientific paper

We present the Pa alpha emission profile of the ultraluminous infrared galaxy (ULFIRG) IRAS 07598+6508 which is an unusually strong Fe II emitter in the optical. The Pa alpha emission line profile shows a blueshifted broad component (FWHM approximately equal to 3900 km/sec) together with a narrow core (FWHM less than or equal to 530 km/sec). The presence of the broad line component strongly suggests that IRAS 07598+6508 has an active galactic nucleus, supporting a scenario of merger-induced quasar formation proposed by Sanders et al. (1988), although we cannot rule out the possibility of a supernova-driven high speed wind. Possible detection of (Fe II) 1.893 micrometer emission is also reported. It is shown that strong Fe II emitters such as IRAS 07598+6508 have intermediate IRAS color properties between normal quasars and cold ultraluminous infrared galaxies. We thus suggest an evolutionary link from cold ULFIRG through warm ULFIRG and Fe II ULFIRG to quasars.

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