Comment on the discordant redshift pair VV 76 (NGC 4496A, B)

Details Comment on the discordant redshift pair VV 76 (NGC 4496A, B) Comment on the discordant redshift pair VV 76 (NGC 4496A, B)

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..436a&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, April 1990, p. 436-439.

Mathematics

Probability

1

Interacting Galaxies, Red Shift, Astronomical Spectroscopy, Emission Spectra, H Ii Regions, Supernovae

Scientific paper

This pair of apparently interacting galaxies of redshift cz = 1700 and 4500 km/s has recently been judged to be an optical superposition of background and foreground galaxies. The probability, from their separation on the sky, was calculated to be p = 0.006. A corrected calculation, however, yields p = 0.001. Moreover, if observed features of the pair which would be expected on the basis of physical interaction, and not expected on the basis of chance, are taken into account, the probability of accidental superposition becomes p less than about 10 to the -6th. It is further noted that the distribution of H II regions in NGC 4496A, B fits the peculiar pattern established previously for other physically interacting pairs of both similar and discordant redshift. Finally, comments on the possible supernova in the high-redshift member are made.

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