Statistics – Computation
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...248...30y&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 248, no. 1, Aug. 1991, p. 30-36.
Statistics
Computation
2
Color, Galactic Evolution, Star Formation Rate, Starburst Galaxies, Stellar Oscillations, Astronomical Models, Color-Color Diagram, Computational Astrophysics, Red Shift, Stellar Mass
Scientific paper
The color evolution of galaxies with oscillating star-forming activities is studied. In starburst galaxies, the pattern of color oscillation is determined by the burst strength and the effective stellar mass which contributes most to the total galactic light; both are strongly dependent on the IMF slope. For flat IMF, the trajectory draws an open loop in the color-color diagram, while for steep IMF the trajectory fills in a parallelogram-shaped region and eventually degenerates into a line with tiny kinks marking the epochs of star bursts. This suggests that the slope of the IMF for burst populations is Salpeter-like (x = 1.35) or more flattish (x = 0.35). Any starburst with x = 2.35, if it happens, could not be detected. Implications of the results are discussed in connection with colors of interacting galaxy pairs and the excess of blue galaxies in clusters of intermediate redshifts.
Arimoto Nobou
Yoshii Yoji
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