Mathematics – Logic
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99q.136d&link_type=abstract
Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.136
Mathematics
Logic
Scientific paper
We present J and K' photometry, as well as J-K' colours, for thebulges and disks of a sample of approximately 100 spiral galaxies taken from the Revised Shapley-Ames Catalog and the Second Reference Catalogue of Bright Galaxies. Data were obtained from 2MASS, subject to the criteria that the apparent Bmagnitude BT =12.5 mag and the declination d > 0°. The bulge and disk components have been deblended using GALFIT, a two-dimensional galaxy fitting program. The sample galaxies, representing morphological types Sa through Sc (T = 0-5), have also been studied in some detail spectroscopically by Ho, Filippenko, & Sargent (1997). Colour-magnitude diagrams and colour gradients for each of the galaxies are also presented and described. We illustrate the Simien and de Vaucouleurs diagrams -- bulge-todisk ratio vs. morphological type -- for the J and K' bands. While there is a clear trend with morphology, there is a large dispersion for each morphological type.
de Robertis Michael M.
Dong Xiaoyi
Ryan Christopher J.
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