A large sample of southern IRAS galaxies - Spectral classes and superclustering

Details A large sample of southern IRAS galaxies - Spectral classes and superclustering A large sample of southern IRAS galaxies - Spectral classes and superclustering

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..528a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 528-543.

Astronomy and Astrophysics

Astronomy

70

Astronomical Spectroscopy, Galactic Clusters, Infrared Astronomy Satellite, Infrared Spectra, Starburst Galaxies, Brightness Distribution, Classifications, Infrared Astronomy, Red Shift, Southern Sky, Spectrum Analysis

Scientific paper

Results are presented of an extensive spectroscopic survey of IRAS galaxies, in three Southern-Hemisphere fields totaling about 0.5 sr. Spectroscopic observations have been made of 527 galaxies which are candidates for 474 IRAS sources. Together with published data, there are now measured redshifts for almost 850 of the 1178 selected IRAS galaxies in these fields. This measured sample includes nearly all galaxies at high redshifts, and hense high infrared luminosities, within these fields. Classification of more than 350 of these galaxies using emission-line ratios and line widths shows that about 90 percent have starburst characteristics. Two distinct groups of starburst galaxies in the sample display forbidden O III-line intensities which significantly exceed those observed in optically selected starburst galaxies. One of these groups, with strong N II forbidden lines, may be related to liners and/or Seyfert galaxies. The other, with weak N II forbidden-line emission, displays unusually narrow lines; this group is interpreted in terms of the youngest phase of starburst activity.

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