Two-dimensional Decomposition of Bulge and Disk

Details Two-dimensional Decomposition of Bulge and Disk Two-dimensional Decomposition of Bulge and Disk

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...448..563b&link_type=abstract

Astrophysical Journal v.448, p.563

Astronomy and Astrophysics

Astronomy

64

Galaxies: Photometry, Galaxies: Structure, Methods: Numerical

Scientific paper

We describe a method of bulge-to-disk decomposition which utilizes a full two-dimensional image of a galaxy. It provides much better estimates of the structural parameters for each component than the widely used conventional procedure which involves a χ2 decomposition on elliptically averaged profiles. The performances of the conventional one-dimensional method and the present two-dimensional technique are compared by using a set of realistic model galaxy images. We show that the conventional one-dimensional decomposition procedure is subject to strong systematic errors associated with the derivation of the elliptically averaged radial surface brightness profiles; these errors come from the different intrinsic shapes of disk and bulge, combined with the effects of viewing inclination. The present two-dimensional approach successfully recovers the intrinsic parameters for a wide range of B/D ratios at all inclinations.

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