Other
Scientific paper
Feb 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.254..723f&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 254, Feb. 15, 1992, p. 723-728.
Other
53
Astronomical Photography, Elliptical Galaxies, Interacting Galaxies, Isophotes, Shell Galaxies, Galactic Evolution, Galactic Structure, Visible Spectrum
Scientific paper
An improved shell-finding algorithm is described and images of eight previously unknown shell galaxies visible from the Northern Hemisphere are presented. The data were obtained in the R-band using the 1-m Jacobus Kapteyn Telescope, located in the Canary Islands. Most of the galaxies were selected on the basis of independent evidence for a merger or interaction, such as extensive dust or kinematically decoupled cores. The detection of shells and other fine structures is achieved by subtracting a smooth elliptical model of the underlying galaxy and then inspecting the residual map. The isophotal distortions resulting from these structures are quantified using the fourth cosine term of the isophotal intensity. In particular, it is suggested that shells may be responsible for boxy isophotes in some cases.
Forbes Duncan A.
Thomson Robert C.
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