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On the mass discrepancy in double galaxies
Author(s) -
Oleak H.
Publication year - 1976
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.19762970102
Subject(s) - physics , astrophysics , galaxy , spiral galaxy , dispersion (optics) , elliptical galaxy , function (biology) , optics , evolutionary biology , biology
Comparing the M/L ‐distribution function of single spiral and irregular galaxies with that of double galaxies (S,S and E,E) from the list of K ARACHENTSEV (1974) it can be shown that the mass discrepancy can be ascribed to the skewedness of this frequency function and thus to the strong dependence of the mean value of M/L on the dispersion. An unavoidable enlargement of the dispersion by errors of measurement and wrong attachment of objects of the sample always raises the mean of M/L . This effect could be then mistaken for a mass discrepancy.