Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.252..593z&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 252, Oct. 15, 1991, p. 593-599. Research supported by N
Astronomy and Astrophysics
Astronomy
29
Infrared Astronomy Satellite, Interacting Galaxies, Spaceborne Astronomy, Charge Coupled Devices, Far Infrared Radiation, Luminosity, Sky Surveys (Astronomy)
Scientific paper
A sample consisting of 41 ultraluminous IRAS galaxies with far-infrared luminosities greater than 10 exp 12 solar luminosities is examined, as well as a control sample of 41 low-luminosity IRAS galaxies with luminosities less than 10 exp 9.7. Their images on the film copies of the SERC Sky Survey were scanned with a pixel size of 5 microns over a square area of typically 6.72 arcsec to the side. The density contour maps and the sky survey material show that the proportion of ultraluminous IRAS galaxies which are interacting or merger systems, 61 +/-12 percent, is much higher than that of low-luminosity ones (10 +/-5 percent), but still well short of the 100 percent suggested in several recent reports. This result supports the conclusion that galaxy interaction or merging is more common at high-IR luminosity, but it is probably not the only cause of their activity.
Deng Zugan
Su Hongjun
Xia Xiaoyang
Zou Zhenlong
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