Near Infrared Spectroscopy of Ultraluminous Infrared Galaxies

Details Near Infrared Spectroscopy of Ultraluminous Infrared Galaxies Near Infrared Spectroscopy of Ultraluminous Infrared Galaxies

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.5406g&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #54.06; Bulletin of the American Astronomical Society, Vol. 24, p.1211

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Scientific paper

We have undertaken a program to obtain 2 - 2.5microns spectra of a complete sample of luminous infrared galaxies. We report here first results for the ultraluminous members of that sample (L_IR >= 10(12) Lsun). Our spectra were obtained with the CGS4 spectrometer on UKIRT, and have a spectral resolution R=340. Numerous emission lines, especially Brgamma , HeI, and the v=1-0 and v=2-1 transitions of H_2, as well as absorption features from CO and other species in stellar atmospheres, are seen at high signal to noise. Broad Brgamma lines (FWHM > 1000 km s(-1) ) have been detected in several galaxies. Interestingly, the H_2 lines in those galaxies are apparently no broader than the instrumental resolution of 1000 km s(-1) . We will discuss the astrophysical implications of these and other features of the spectra.

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