Statistical properties of the emission in mixed-morphology (E+S) pairs. I. Optical results.

Details Statistical properties of the emission in mixed-morphology (E+S) pairs. I. Optical results. Statistical properties of the emission in mixed-morphology (E+S) pairs. I. Optical results.

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aj....118..108h&link_type=abstract

Astronomical Journal, Vol. 118, No. 1, p. 108 - 125

Mathematics

Logic

33

Galaxy Pairs: Morphology, Galaxy Pairs: Luminosity Function

Scientific paper

The authors present a statistical analysis of the optical emission properties for a mixed-morphology (E+S) sample of galaxy pairs. The sample is large and diverse enough (≡150 pairs) to permit discrimination of pairs by morphological types. It samples a large enough volume of space to justify derivation of the optical luminosity function. The authors find an average factor of 1.6 enhancement in the optical luminosity of the late-type pair components relative to an isolated galaxy control sample. This is interpreted as the optical signature of the interaction - star formation connection. The authors find a complete absence of dwarf pairs (MZw ≥ -17.0) that is probably related to a corresponding lack of isolated E/S0 dwarf galaxies in the control sample. The spirals in (E+S) and (S+S) pairs show similar levels of optical enhancement but fail to show a trend toward higher luminosity with decreasing companion separation. A first-order comparison of galaxy type distributions between the pair and isolated samples suggests that (1) pairs show an excess of elliptical and early-type spiral (Sa-b) components and (2) corresponding deficit of S0s and late-type spirals in the "E" and "S" pair components, respectively. The authors consider both possible bias and dynamical explanations for (1) the observed (E+S) spiral-component luminosity excess and (2) the morphology excesses/deficits.

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