Evolutionary method of population synthesis for bulge-disc systems - Optical-infrared colour-magnitude relation of spiral galaxies

Details Evolutionary method of population synthesis for bulge-disc systems - Optical-infrared colour-magnitude relation of spiral galaxies Evolutionary method of population synthesis for bulge-disc systems - Optical-infrared colour-magnitude relation of spiral galaxies

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..374a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 374-388.

Astronomy and Astrophysics

Astrophysics

30

Color-Magnitude Diagram, Disk Galaxies, Galactic Bulge, Infrared Radiation, Light (Visible Radiation), Spiral Galaxies, Galactic Evolution, Infrared Photometry, Star Formation, Visual Photometry

Scientific paper

To study star-formation history in spiral galaxies a photometric evolution model for the bulge-disc system has been developed using the evolutionary method of population synthesis. It is shown that most photometric properties of spiral galaxies can be explained essentially by a single parameter, the bulge-to-disc light ratio, LB/LD. The LB/LD ratio is a single dominant parameter which leads to the observed trends of optical and optical-infrared colors with morphological type. The scatters in these colors at one type are due to the intrinsic scatter in the LB/LD ratio. Bulges and discs have almost the same JHK colors and the near infrared colors do not depend significantly on the LB/LD ratio. It is concluded that the observed gradients in UBV colors along the discs of spiral galaxies can be fully explained by the local bulge-to-disc light ratio.

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